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Tweak FDC command timing and add register access waitstates. Fixes floppy in Windows 98 with VA-503.

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This commit is contained in:
SarahW 2019-02-13 22:12:53 +00:00
commit 01e86135ab
1 changed files with 7 additions and 1 deletions
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8
src/fdc.c
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@ -9,6 +9,7 @@
#include "io.h"
#include "pic.h"
#include "timer.h"
#include "x86.h"
static int fdc_reset_stat = 0;
/*FDC*/
@ -320,6 +321,8 @@ void fdc_write(uint16_t addr, uint8_t val, void *priv)
// pclog("Write FDC %04X %02X %04X:%04X %i %02X %i rate=%i %i\n",addr,val,cs>>4,pc,ins,fdc.st0,ins,fdc.rate, fdc.data_ready);
int drive;
cycles -= ISA_CYCLES(8);
switch (addr&7)
{
case 1: return;
@ -550,7 +553,7 @@ bad_command:
// pclog("Got all params %02X\n", fdc.command);
fdc.stat=0x30;
discint=fdc.command&0x1F;
timer_set_delay_u64(&fdc.timer, 1024 * TIMER_USEC);
timer_set_delay_u64(&fdc.timer, 256 * TIMER_USEC);
// fdc.drive = fdc.params[0] & 3;
disc_drivesel = fdc.drive & 1;
fdc_reset_stat = 0;
@ -674,6 +677,9 @@ uint8_t fdc_read(uint16_t addr, void *priv)
{
uint8_t temp;
int drive;
cycles -= ISA_CYCLES(8);
// /*if (addr!=0x3f4) */printf("Read FDC %04X %04X:%04X %04X %i %02X %02x %i ",addr,cs>>4,pc,BX,fdc.pos,fdc.st0,fdc.stat,ins);
switch (addr&7)
{