mirror of
https://github.com/RaySollium99/picodrive.git
synced 2025-09-05 15:27:46 -04:00
sms, improved mapper support (more, menu option)
This commit is contained in:
kub
parent
68e7a5c1c0
commit
f9ea940fb5
7 changed files with 206 additions and 55 deletions
208
pico/sms.c
208
pico/sms.c
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@ -10,7 +10,7 @@
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* TODO:
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* - start in a state as if BIOS ran (partly done for VDP registers, RAM)
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* - region support (currently only very limited PAL and Mark-III support)
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* - mappers: EEPROM, some obscure Korean (Nemesis, Janggun)
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* - mapper for EEPROM support
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*/
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#include "pico_int.h"
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#include "memory.h"
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@ -261,11 +261,16 @@ static void z80_sms_out(unsigned short a, unsigned char d)
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}
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}
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// ROM/SRAM bank mapping, see https://www.smspower.org/Development/Mappers
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static int bank_mask;
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static void xwrite(unsigned int a, unsigned char d);
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static void write_sram(unsigned short a, unsigned char d)
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// Sega mapper. Maps 3 banks 16KB each, with SRAM support
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static void write_sram_sega(unsigned short a, unsigned char d)
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{
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// SRAM is mapped in 2 16KB banks, selected by bit 2 in control reg
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a &= 0x3fff;
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@ -275,12 +280,13 @@ static void write_sram(unsigned short a, unsigned char d)
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Pico.sv.data[a] = d;
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}
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// 16KB bank mapping for Sega mapper
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static void write_bank_sega(unsigned short a, unsigned char d)
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{
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if (a < 0xfff8) return;
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// avoid mapper detection for RAM fill with 0
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if (Pico.ms.mapper != PMS_MAP_SEGA && (Pico.ms.mapper || d == 0)) return;
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elprintf(EL_Z80BNK, "bank 16k %04x %02x @ %04x", a, d, z80_pc());
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elprintf(EL_Z80BNK, "bank sega %04x %02x @ %04x", a, d, z80_pc());
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Pico.ms.mapper = PMS_MAP_SEGA;
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Pico.ms.carthw[a & 0x0f] = d;
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@ -303,7 +309,7 @@ static void write_bank_sega(unsigned short a, unsigned char d)
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if (Pico.ms.carthw[0xc] & 0x08) {
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d = (Pico.ms.carthw[0xc] & 0x04) >> 2;
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z80_map_set(z80_read_map, 0x8000, 0xbfff, Pico.sv.data + d*0x4000, 0);
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z80_map_set(z80_write_map, 0x8000, 0xbfff, write_sram, 1);
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z80_map_set(z80_write_map, 0x8000, 0xbfff, write_sram_sega, 1);
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} else {
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d = Pico.ms.carthw[0xf] & bank_mask;
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z80_map_set(z80_read_map, 0x8000, 0xbfff, Pico.rom + (d << 14), 0);
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@ -313,12 +319,13 @@ static void write_bank_sega(unsigned short a, unsigned char d)
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}
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}
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// 16KB bank mapping for Codemasters mapper, TODO: SRAM support
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// Codemasters mapper. Similar to Sega, but different addresses, TODO: SRAM
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static void write_bank_codem(unsigned short a, unsigned char d)
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{
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// don't detect @0x0 to avoid confusing with MSX
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if (Pico.ms.mapper != PMS_MAP_CODEM && (Pico.ms.mapper || (a|d) == 0)) return;
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elprintf(EL_Z80BNK, "bank 16k %04x %02x @ %04x", a, d, z80_pc());
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if (a >= 0xc000 || (a & 0x3fff)) return; // address is 0x0000, 0x4000, 0x8000?
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// don't detect linear mapping to avoid confusing with MSX
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if (Pico.ms.mapper != PMS_MAP_CODEM && (Pico.ms.mapper || (a>>14) == d)) return;
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elprintf(EL_Z80BNK, "bank codem %04x %02x @ %04x", a, d, z80_pc());
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Pico.ms.mapper = PMS_MAP_CODEM;
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Pico.ms.carthw[a>>14] = d;
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@ -326,12 +333,13 @@ static void write_bank_codem(unsigned short a, unsigned char d)
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z80_map_set(z80_read_map, a, a+0x3fff, Pico.rom + (d << 14), 0);
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}
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// 8KB bank mapping for MSX mapper
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// MSX mapper. 4 selectable 8KB banks at the top
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static void write_bank_msx(unsigned short a, unsigned char d)
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{
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// don't detect @0x0 to avoid confusing with Codemasters
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if (a > 0x0003) return;
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// don't detect linear mapping to avoid confusing with Codemasters
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if (Pico.ms.mapper != PMS_MAP_MSX && (Pico.ms.mapper || (a|d) == 0)) return;
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elprintf(EL_Z80BNK, "bank 8k %04x %02x @ %04x", a, d, z80_pc());
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elprintf(EL_Z80BNK, "bank msx %04x %02x @ %04x", a, d, z80_pc());
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Pico.ms.mapper = PMS_MAP_MSX;
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Pico.ms.carthw[a] = d;
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@ -340,9 +348,23 @@ static void write_bank_msx(unsigned short a, unsigned char d)
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z80_map_set(z80_read_map, a, a+0x1fff, Pico.rom + (d << 13), 0);
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}
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// 32KB bank mapping for Korean n-in-1 packs
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// Korea mapping, 1 selectable 16KB bank at the top
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static void write_bank_korea(unsigned short a, unsigned char d)
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{
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if (a != 0xa000) return;
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if (Pico.ms.mapper != PMS_MAP_KOREA && (Pico.ms.mapper)) return;
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elprintf(EL_Z80BNK, "bank korea %04x %02x @ %04x", a, d, z80_pc());
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Pico.ms.mapper = PMS_MAP_KOREA;
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Pico.ms.carthw[0xf] = d;
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d &= bank_mask;
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z80_map_set(z80_read_map, 0x8000, 0xbfff, Pico.rom + (d << 14), 0);
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}
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// Korean n-in-1 mapping. 1 selectable 32KB bank at the bottom
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static void write_bank_n32k(unsigned short a, unsigned char d)
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{
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if (a != 0xffff) return;
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// code must be in RAM since all visible ROM space is swapped
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if (Pico.ms.mapper != PMS_MAP_N32K && (Pico.ms.mapper || z80_pc() < 0xc000)) return;
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elprintf(EL_Z80BNK, "bank 32k %04x %02x @ %04x", a, d, z80_pc());
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@ -353,9 +375,10 @@ static void write_bank_n32k(unsigned short a, unsigned char d)
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z80_map_set(z80_read_map, 0, 0x7fff, Pico.rom + (d << 15), 0);
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}
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// 16KB bank mapping for Korean n-in-1 packs
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// Korean 4-in-1. 2 selectable 16KB banks, top bank is shifted by bottom one
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static void write_bank_n16k(unsigned short a, unsigned char d)
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{
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if (a != 0x3ffe && a != 0x7fff && a != 0xbfff) return;
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// code must be in RAM since all visible ROM space is swapped
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if (Pico.ms.mapper != PMS_MAP_N16K && (Pico.ms.mapper || z80_pc() < 0xc000)) return;
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elprintf(EL_Z80BNK, "bank 16k %04x %02x @ %04x", a, d, z80_pc());
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@ -369,7 +392,61 @@ static void write_bank_n16k(unsigned short a, unsigned char d)
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z80_map_set(z80_read_map, a, a+0x3fff, Pico.rom + (d << 14), 0);
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}
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// TODO mapping is currently auto-selecting, but that's not totally reliable.
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// MSX-Nemesis mapper. 4 selectable 8KB banks at the top
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static void write_bank_msxn(unsigned short a, unsigned char d)
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{
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if (a > 0x0003) return;
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// never autodetected, selectable only via config
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if (Pico.ms.mapper != PMS_MAP_NEMESIS) return;
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elprintf(EL_Z80BNK, "bank nems %04x %02x @ %04x", a, d, z80_pc());
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Pico.ms.carthw[a] = d;
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a = (a^2)*0x2000 + 0x4000;
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d &= 2*bank_mask + 1;
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z80_map_set(z80_read_map, a, a+0x1fff, Pico.rom + (d << 13), 0);
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}
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// Korean Janggun mapper. 4 selectable 8KB banks at the top, hardware byte flip
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static unsigned char read_flipped_jang(unsigned a)
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{
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static unsigned char flipper[16] = // reversed nibble bit order
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{ 0x0,0x8,0x4,0xc,0x2,0xa,0x6,0xe,0x1,0x9,0x5,0xd,0x3,0xb,0x7,0xf };
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unsigned char c;
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// return value at address a in reversed bit order
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c = Pico.rom[(Pico.ms.carthw[a>>13] << 13) + (a & 0x1fff)];
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return (flipper[c&0xf]<<4) | flipper[c>>4];
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}
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static void write_bank_jang(unsigned short a, unsigned char d)
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{
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// address is 0xfffe, 0xffff, 0x4000, 0x6000, 0x8000, 0xa000
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if ((a|1) != 0xffff && (!((a^(a<<1)) & 0x8000) || (a & 0x1fff))) return;
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// never autodetected, selectable only via config
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if (Pico.ms.mapper != PMS_MAP_JANGGUN) return;
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elprintf(EL_Z80BNK, "bank jang %04x %02x @ %04x", a, d, z80_pc());
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if ((a|1) == 0xffff) {
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int x = a & 1, f = d & 0x40;
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Pico.ms.carthw[x] = d;
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d &= bank_mask;
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Pico.ms.carthw[2*x + 2] = 2*d, Pico.ms.carthw[2*x + 3] = 2*d+1;
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a = (x+1) * 0x4000;
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if (!f)
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z80_map_set(z80_read_map, a, a+0x3fff, Pico.rom + (d << 14), 0);
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else
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z80_map_set(z80_read_map, a, a+0x3fff, read_flipped_jang, 1);
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} else {
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d &= 2*bank_mask + 1;
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Pico.ms.carthw[a>>13] = d;
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if (!(Pico.ms.carthw[(a>>15)&1] & 0x40))
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z80_map_set(z80_read_map, a, a+0x1fff, Pico.rom + (d << 13), 0);
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else
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z80_map_set(z80_read_map, a, a+0x1fff, read_flipped_jang, 1);
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}
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}
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// TODO auto-selecting is not really reliable.
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// Before adding more mappers this should be revised.
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static void xwrite(unsigned int a, unsigned char d)
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{
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@ -377,52 +454,58 @@ static void xwrite(unsigned int a, unsigned char d)
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if (a >= 0xc000)
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PicoMem.zram[a & 0x1fff] = d;
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// NB the sequence of mappers is crucial for the auto detection
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// Korean n-in-1. 1 selectable 32KB bank at the bottom
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if (a == 0xffff)
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write_bank_n32k(a, d);
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// Sega. Maps 3 banks 16KB each, SRAM
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if (a >= 0xfff8)
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write_bank_sega(a, d);
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// MSX. 4 selectable 8KB banks at the top
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if (a <= 0x0003)
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write_bank_msx(a, d);
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// Codemasters. Similar to Sega, but different addresses
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if (a < 0xc000 && (a & 0x3fff) == 0)
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write_bank_codem(a, d);
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// Korean. 1 selectable 16KB bank at the top
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if (a == 0xa000)
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write_bank_codem(0x8000, d);
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// Korean n-in-1. 2 selectable 16KB banks, top bank has offset from bottom one
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if (a == 0x3ffe || a == 0x7fff || a == 0xbfff)
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write_bank_n16k(a, d);
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switch (Pico.ms.mapper) { // via config, or auto detected
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case PMS_MAP_SEGA: write_bank_sega(a, d); break;
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case PMS_MAP_CODEM: write_bank_codem(a, d); break;
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case PMS_MAP_MSX: write_bank_msx(a, d); break;
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case PMS_MAP_KOREA: write_bank_korea(a, d); break;
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case PMS_MAP_N32K: write_bank_n32k(a, d); break;
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case PMS_MAP_N16K: write_bank_n16k(a, d); break;
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case PMS_MAP_JANGGUN: write_bank_jang(a, d); break;
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case PMS_MAP_NEMESIS: write_bank_msxn(a, d); break;
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case PMS_MAP_AUTO:
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// NB the sequence of mappers is crucial for the auto detection
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write_bank_n32k(a, d);
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write_bank_sega(a, d);
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write_bank_msx(a, d);
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write_bank_codem(a, d);
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write_bank_korea(a, d);
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write_bank_n16k(a, d);
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break;
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}
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}
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void PicoResetMS(void)
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{
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z80_reset();
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PsndReset(); // pal must be known here
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Pico.ms.fm_ctl = 0xff;
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Pico.m.dirtyPal = 1;
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unsigned tmr;
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int hw;
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// set preselected hw/mapper from config
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if (PicoIn.hwSelect) {
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switch (PicoIn.hwSelect) {
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case PHWS_GG: Pico.m.hardware |= 0x1; break;
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default: Pico.m.hardware &= ~0x1; break;
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}
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} else {
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unsigned tmr;
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}
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if (PicoIn.mapper)
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Pico.ms.mapper = PicoIn.mapper;
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// check if the ROM header contains more system information to detect GG
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for (tmr = 0x2000; tmr < 0xbfff && tmr <= Pico.romsize; tmr *= 2) {
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if (!memcmp(Pico.rom + tmr-16, "TMR SEGA", 8)) {
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if (Pico.rom[tmr-1] >= 0x50 && Pico.rom[tmr-1] < 0x80)
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Pico.m.hardware |= 0x1;
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break;
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}
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// check if the ROM header contains more system information
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for (tmr = 0x2000; tmr < 0xbfff && tmr <= Pico.romsize; tmr *= 2) {
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if (!memcmp(Pico.rom + tmr-16, "TMR SEGA", 8)) {
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hw = Pico.rom[tmr-1] >> 4;
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if (hw >= 0x5 && hw < 0x8 && !PicoIn.hwSelect)
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Pico.m.hardware |= 0x1; // GG cartridge detected
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break;
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}
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}
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z80_reset();
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PsndReset(); // pal must be known here
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Pico.ms.fm_ctl = 0xff;
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Pico.m.dirtyPal = 1;
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// reset memory mapping
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PicoMemSetupMS();
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@ -439,7 +522,7 @@ void PicoResetMS(void)
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Pico.video.reg[9] = 0x00;
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Pico.video.reg[10] = 0xff;
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// BIOS, clear zram (fake unitialized on japanese NTSC devices)
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// BIOS, clear zram (unitialized on Mark-III, cf src/mame/drivers/sms.cpp)
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memset(PicoMem.zram, PicoIn.regionOverride&1 ? 0xf0:0, sizeof(PicoMem.zram));
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}
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@ -463,7 +546,7 @@ void PicoPowerMS(void)
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bank_mask = (tmp - 1) >> 14;
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PicoMem.ioports[0] = 0xc3; // hack to jump @0 at end of RAM to wrap around
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Pico.ms.mapper = 0;
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Pico.ms.mapper = PicoIn.mapper;
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PicoReset();
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}
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@ -477,6 +560,9 @@ void PicoMemSetupMS(void)
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z80_map_set(z80_write_map, 0xc000, 0xdfff, PicoMem.zram, 0);
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z80_map_set(z80_write_map, 0xe000, 0xffff, xwrite, 1);
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// Nemesis mapper maps last 8KB rom bank #15 to adress 0
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if (Pico.ms.mapper == PMS_MAP_NEMESIS && Pico.romsize > 0x1e000)
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z80_map_set(z80_read_map, 0x0000, 0x1fff, Pico.rom + 0x1e000, 0);
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#ifdef _USE_DRZ80
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drZ80.z80_in = z80_sms_in;
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drZ80.z80_out = z80_sms_out;
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@ -488,14 +574,21 @@ void PicoMemSetupMS(void)
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// memory mapper setup, linear mapping of 1st 48KB
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u8 mapper = Pico.ms.mapper;
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if (Pico.ms.mapper == PMS_MAP_MSX) {
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if (mapper == PMS_MAP_MSX || mapper == PMS_MAP_NEMESIS) {
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xwrite(0x0000, 4);
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xwrite(0x0001, 5);
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xwrite(0x0002, 2);
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xwrite(0x0003, 3);
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} else if (Pico.ms.mapper == PMS_MAP_N32K) {
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} else if (mapper == PMS_MAP_N32K) {
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xwrite(0xffff, 0);
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} else if (Pico.ms.mapper == PMS_MAP_CODEM) {
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} else if (mapper == PMS_MAP_N16K) {
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xwrite(0x3ffe, 0);
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xwrite(0x7fff, 1);
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xwrite(0xbfff, 2);
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} else if (mapper == PMS_MAP_JANGGUN) {
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xwrite(0xfffe, 1);
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xwrite(0xffff, 2);
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} else if (mapper == PMS_MAP_CODEM) {
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xwrite(0x0000, 0);
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xwrite(0x4000, 1);
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xwrite(0x8000, 2);
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@ -511,13 +604,22 @@ void PicoMemSetupMS(void)
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void PicoStateLoadedMS(void)
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{
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u8 mapper = Pico.ms.mapper;
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if (Pico.ms.mapper == PMS_MAP_MSX) {
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if (Pico.ms.mapper == PMS_MAP_MSX || Pico.ms.mapper == PMS_MAP_NEMESIS) {
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xwrite(0x0000, Pico.ms.carthw[0]);
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xwrite(0x0001, Pico.ms.carthw[1]);
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xwrite(0x0002, Pico.ms.carthw[2]);
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xwrite(0x0003, Pico.ms.carthw[3]);
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} else if (Pico.ms.mapper == PMS_MAP_N32K) {
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xwrite(0xffff, Pico.ms.carthw[0x0f]);
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} else if (Pico.ms.mapper == PMS_MAP_N16K) {
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xwrite(0x3ffe, Pico.ms.carthw[0]);
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xwrite(0x7fff, Pico.ms.carthw[1]);
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xwrite(0xbfff, Pico.ms.carthw[2]);
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} else if (Pico.ms.mapper == PMS_MAP_JANGGUN) {
|
||||
xwrite(0x4000, Pico.ms.carthw[2]);
|
||||
xwrite(0x6000, Pico.ms.carthw[3]);
|
||||
xwrite(0x8000, Pico.ms.carthw[4]);
|
||||
xwrite(0xa000, Pico.ms.carthw[5]);
|
||||
} else if (Pico.ms.mapper == PMS_MAP_CODEM) {
|
||||
xwrite(0x0000, Pico.ms.carthw[0]);
|
||||
xwrite(0x4000, Pico.ms.carthw[1]);
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue