f6ef1f833c
Thoroughly clean up the code to vastly reduce the number of compiler warnings and found and fixed several bugs in the process; Applied all mainline PCem commits; Added SCSI hard disk emulation; Commented out all unfinished machines and graphics cards; Added the AOpen AP53 and ASUS P/I-P55T2 machines as well as another Tyan 440FX machine, all three with AMI WinBIOS (patch from TheCollector1995); Added the Diamond Stealth 3D 3000 (S3 ViRGE/VX) graphics card (patch from TheCollector1995); Added the PS/2 XT IDE (AccuLogic) HDD Controller (patch from TheCollector1995); Added Microsoft/Logitech Bus Mouse emulation (patch from waltje); Overhauled the makefiles (patch from waltje); Added the Adaptec AHA-1542CF SCSI controller (patch from waltje); Added preliminary (but still unfinished) Adaptec AHA-154x SCSI controller BIOS support (patch from waltje); Added an ISABugger debugging device (patch from waltje); Added sanity checks to the Direct3D code.
178 lines
5.3 KiB
C
178 lines
5.3 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 "io.h"
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#include "tandy_eeprom.h"
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typedef struct
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{
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int state;
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int count;
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int addr;
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int clock;
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uint16_t data;
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uint16_t store[64];
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int romset;
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} tandy_eeprom_t;
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enum
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{
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EEPROM_IDLE,
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EEPROM_GET_OPERATION,
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EEPROM_READ,
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EEPROM_WRITE
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};
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static int eeprom_data_out;
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void tandy_eeprom_write(uint16_t addr, uint8_t val, void *p)
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{
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tandy_eeprom_t *eeprom = (tandy_eeprom_t *)p;
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if ((val & 4) && !eeprom->clock)
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{
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switch (eeprom->state)
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{
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case EEPROM_IDLE:
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switch (eeprom->count)
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{
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case 0:
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if (!(val & 3))
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eeprom->count = 1;
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else
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eeprom->count = 0;
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break;
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case 1:
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if ((val & 3) == 2)
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eeprom->count = 2;
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else
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eeprom->count = 0;
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break;
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case 2:
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if ((val & 3) == 3)
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eeprom->state = EEPROM_GET_OPERATION;
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eeprom->count = 0;
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break;
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}
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break;
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case EEPROM_GET_OPERATION:
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eeprom->data = (eeprom->data << 1) | (val & 1);
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eeprom->count++;
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if (eeprom->count == 8)
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{
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eeprom->count = 0;
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eeprom->addr = eeprom->data & 0x3f;
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switch (eeprom->data & 0xc0)
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{
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case 0x40:
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eeprom->state = EEPROM_WRITE;
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break;
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case 0x80:
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eeprom->state = EEPROM_READ;
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eeprom->data = eeprom->store[eeprom->addr];
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break;
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default:
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eeprom->state = EEPROM_IDLE;
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break;
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}
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}
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break;
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case EEPROM_READ:
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eeprom_data_out = eeprom->data & 0x8000;
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eeprom->data <<= 1;
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eeprom->count++;
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if (eeprom->count == 16)
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{
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eeprom->count = 0;
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eeprom->state = EEPROM_IDLE;
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}
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break;
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case EEPROM_WRITE:
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eeprom->data = (eeprom->data << 1) | (val & 1);
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eeprom->count++;
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if (eeprom->count == 16)
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{
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eeprom->count = 0;
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eeprom->state = EEPROM_IDLE;
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eeprom->store[eeprom->addr] = eeprom->data;
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}
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break;
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}
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}
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eeprom->clock = val & 4;
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}
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int tandy_eeprom_read()
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{
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return eeprom_data_out;
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}
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void *tandy_eeprom_init()
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{
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tandy_eeprom_t *eeprom = malloc(sizeof(tandy_eeprom_t));
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FILE *f;
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memset(eeprom, 0, sizeof(tandy_eeprom_t));
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eeprom->romset = romset;
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switch (romset)
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{
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case ROM_TANDY1000HX:
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f = romfopen(nvr_concat("tandy1000hx.bin"), "rb");
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break;
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case ROM_TANDY1000SL2:
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f = romfopen(nvr_concat("tandy1000sl2.bin"), "rb");
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break;
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}
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if (f)
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{
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fread(eeprom->store, 128, 1, f);
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fclose(f);
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}
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else
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memset(eeprom->store, 0, 128);
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io_sethandler(0x037c, 0x0001, NULL, NULL, NULL, tandy_eeprom_write, NULL, NULL, eeprom);
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return eeprom;
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}
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void tandy_eeprom_close(void *p)
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{
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tandy_eeprom_t *eeprom = (tandy_eeprom_t *)p;
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FILE *f;
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switch (eeprom->romset)
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{
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case ROM_TANDY1000HX:
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f = romfopen(nvr_concat("tandy1000hx.bin"), "wb");
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break;
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case ROM_TANDY1000SL2:
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f = romfopen(nvr_concat("tandy1000sl2.bin"), "wb");
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break;
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}
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fwrite(eeprom->store, 128, 1, f);
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fclose(f);
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free(eeprom);
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}
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device_t tandy_eeprom_device =
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{
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"Tandy EEPROM",
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0,
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tandy_eeprom_init,
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tandy_eeprom_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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