98 lines
2.8 KiB
C
98 lines
2.8 KiB
C
/* Copyright holders: Sarah Walker
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see COPYING for more details
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*/
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#include <stdlib.h>
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#include "ibm.h"
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#include "device.h"
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#include "mem.h"
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#include "tandy_rom.h"
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static uint8_t *tandy_rom;
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static uint8_t tandy_rom_bank;
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static int tandy_rom_offset;
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static mem_mapping_t tandy_rom_mapping;
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uint8_t tandy_read_rom(uint32_t addr, void *p)
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{
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uint32_t addr2 = (addr & 0xffff) + tandy_rom_offset;
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// if (!nopageerrors) pclog("tandy_read_rom: %05x %05x %02x %04x:%04x\n", addr, addr2, tandy_rom[addr2], CS,pc);
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return tandy_rom[addr2];
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}
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uint16_t tandy_read_romw(uint32_t addr, void *p)
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{
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uint32_t addr2 = (addr & 0xffff) + tandy_rom_offset;
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// if (!nopageerrors) pclog("tandy_read_romw: %05x %05x %04x %04x:%04x\n", addr, addr2, *(uint16_t *)&tandy_rom[addr2], CS,pc);
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return *(uint16_t *)&tandy_rom[addr2];
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}
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uint32_t tandy_read_roml(uint32_t addr, void *p)
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{
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uint32_t addr2 = (addr & 0xffff) + tandy_rom_offset;
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// if (!nopageerrors) pclog("tandy_read_roml: %05x %05x %08x\n", addr, addr2, *(uint32_t *)&tandy_rom[addr2]);
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return *(uint32_t *)&tandy_rom[addr];
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}
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uint8_t tandy_rom_bank_read(uint16_t port, void *p)
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{
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if (port == 0xffea)
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return tandy_rom_bank ^ 0x10;
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else
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return 0xff;
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}
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void tandy_rom_bank_write(uint16_t port, uint8_t val, void *p)
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{
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if (port == 0xffea)
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{
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tandy_rom_bank = val;
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tandy_rom_offset = ((val ^ 4) & 7) * 0x10000;
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mem_mapping_set_exec(&tandy_rom_mapping, &tandy_rom[tandy_rom_offset]);
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// pclog("tandy_rom_bank_write: port=%04x val=%02x offset=%05x\n", port, val, tandy_rom_offset);
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}
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// else
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// pclog("Bad tandy write port=%04x val=%02x\n", port, val);
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}
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void *tandy_rom_init()
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{
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FILE *f, *ff;
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int c;
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tandy_rom = malloc(0x80000);
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f = romfopen("roms/tandy1000sl2/8079047.hu1" ,"rb");
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ff = romfopen("roms/tandy1000sl2/8079048.hu2","rb");
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for (c = 0x0000; c < 0x80000; c += 2)
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{
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tandy_rom[c] = getc(f);
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tandy_rom[c + 1] = getc(ff);
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}
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fclose(ff);
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fclose(f);
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mem_mapping_add(&tandy_rom_mapping, 0xe0000, 0x10000,
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tandy_read_rom, tandy_read_romw, tandy_read_roml,
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NULL, NULL, NULL,
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tandy_rom, MEM_MAPPING_EXTERNAL, NULL);
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io_sethandler(0xffe8, 0x0008, tandy_rom_bank_read, NULL, NULL, tandy_rom_bank_write, NULL, NULL, NULL);
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return tandy_rom;
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}
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void tandy_rom_close(void *p)
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{
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free(p);
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}
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device_t tandy_rom_device =
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{
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"Tandy 1000SL/2 ROM",
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0,
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tandy_rom_init,
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tandy_rom_close,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL
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};
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