80486DX2-66/86Box-fork
1
0
Fork 0
Code Issues Pull Requests Activity

Implement correct DSR behavior, fixes #3715.

Browse Source
This commit is contained in:
OBattler
2024-03-03 18:19:00 +01:00
parent 25da1f1bae
commit e2018775d5
2 changed files with 24 additions and 6 deletions
Download Patch File Download Diff File Expand all files Collapse all files

27
src/floppy/fdc.c
View File

@@ -79,7 +79,6 @@ int floppyrate[4];
int fdc_type = 0;
// #define ENABLE_FDC_LOG 1
#ifdef ENABLE_FDC_LOG
int fdc_do_log = ENABLE_FDC_LOG;
@@ -781,12 +780,27 @@ fdc_write(uint16_t addr, uint8_t val, void *priv)
}
return;
case 4:
if (val & 0x80) {
if (!(val & 0x80)) {
timer_set_delay_u64(&fdc->timer, 8 * TIMER_USEC);
fdc->interrupt = -1;
fdc->perp &= 0xfc;
fdc_ctrl_reset(fdc);
fdc->interrupt = -6;
}
if (fdc->power_down || ((val & 0x80) && !(fdc->dsr & 0x80))) {
if (fdc->power_down) {
timer_set_delay_u64(&fdc->timer, 1000 * TIMER_USEC);
fdc->interrupt = -5;
} else {
timer_set_delay_u64(&fdc->timer, 8 * TIMER_USEC);
fdc->interrupt = -1;
fdc->perp &= 0xfc;
for (i = 0; i < FDD_NUM; i++)
ui_sb_update_icon(SB_FLOPPY | i, 0);
fdc_ctrl_reset(fdc);
}
}
fdc->dsr = val;
return;
case 5: /*Command register*/
if ((fdc->stat & 0xf0) == 0xb0) {
@@ -1532,6 +1546,9 @@ fdc_callback(void *priv)
memset(fdc->pcn, 0x00, 4 * sizeof(uint16_t));
fdc->reset_stat = 4;
return;
case -6: /*DSR Reset clear*/
fdc->dsr |= 0x80;
return;
case 0x01: /* Mode */
fdc->stat = 0x80;
fdc->densel_force = (fdc->params[2] & 0xC0) >> 6;

3
src/include/86box/fdc.h
View File

@@ -115,12 +115,13 @@ typedef struct fdc_t {
uint8_t rw_drive;
uint8_t lock;
uint8_t dsr;
uint8_t params[15];
uint8_t specify[2];
uint8_t res[11];
uint8_t eot[4];
uint8_t rwc[4];
uint8_t params[8];
uint16_t pcn[4];