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Debug msdos bus #52

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Merged
markjfisher merged 3 commits into from
Nov 23, 2025
Merged

Debug msdos bus #52

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36ae28b
[msdos] clear register packs before use.
tschak909 Nov 22, 2025
13413ff
[msdos] fix compilation warning.
tschak909 Nov 22, 2025
5cc3b97
[msdos] return proper error code for e.g. network_read()
tschak909 Nov 22, 2025
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7 changes: 5 additions & 2 deletions msdos/src/bus/int_f5.c
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Original file line number Diff line number Diff line change
Expand Up @@ -12,18 +12,21 @@
*/

#include <dos.h>
#include <string.h>

unsigned char int_f5(unsigned char dev, unsigned char command, unsigned char aux1, unsigned char aux2)
{
union REGS r;


memset(&r,0,sizeof(union REGS));

r.h.dl = 0x00;
r.h.al = dev;
r.h.ah = command;
r.h.cl = aux1;
r.h.ch = aux2;
r.x.si = 0x00;

int86(0xF5,&r,&r);

return r.h.al;
Expand Down
6 changes: 5 additions & 1 deletion msdos/src/bus/int_f5_read.c
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Original file line number Diff line number Diff line change
Expand Up @@ -14,19 +14,23 @@
*/

#include <dos.h>
#include <string.h>

unsigned char int_f5_read(unsigned char dev, unsigned char command, unsigned char aux1, unsigned char aux2, void *buf, unsigned short len)
{
union REGS r;
struct SREGS sr;

memset(&r,0,sizeof(union REGS));
memset(&sr,0,sizeof(struct SREGS));

r.h.dl = 0x40;
r.h.al = dev;
r.h.ah = command;
r.h.cl = aux1;
r.h.ch = aux2;
r.x.si = 0x00;

sr.es = FP_SEG(buf);
r.x.bx = FP_OFF(buf);
r.x.di = len;
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6 changes: 5 additions & 1 deletion msdos/src/bus/int_f5_write.c
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Original file line number Diff line number Diff line change
Expand Up @@ -14,19 +14,23 @@
*/

#include <dos.h>
#include <string.h>

unsigned char int_f5_write(unsigned char dev, unsigned char command, unsigned char aux1, unsigned char aux2, void *buf, unsigned short len)
{
union REGS r;
struct SREGS sr;

memset(&r,0,sizeof(union REGS));
memset(&sr,0,sizeof(struct SREGS));

r.h.dl = 0x80;
r.h.al = dev;
r.h.ah = command;
r.h.cl = aux1;
r.h.ch = aux2;
r.x.si = 0x00;

sr.es = FP_SEG(buf);
r.x.bx = FP_OFF(buf);
r.x.di = len;
Expand Down
7 changes: 5 additions & 2 deletions msdos/src/fn_network/network_status.c
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Original file line number Diff line number Diff line change
Expand Up @@ -2,6 +2,7 @@
#include <stdint.h>
#include <fujinet-network.h>
#include <fujinet-fuji-msdos.h>
#include <string.h>

uint8_t network_status(const char *devicespec, uint16_t *bw, uint8_t *c, uint8_t *err)
{
Expand All @@ -14,6 +15,8 @@ uint8_t network_status(const char *devicespec, uint16_t *bw, uint8_t *c, uint8_t
uint8_t err;
} sr;

memset(&sr,0,sizeof(sr));

ret = int_f5_read(device,'S',0x00,0x00,&sr,sizeof(sr));

if (bw)
Expand All @@ -22,6 +25,6 @@ uint8_t network_status(const char *devicespec, uint16_t *bw, uint8_t *c, uint8_t
*c = sr.c;
if (err)
*err = sr.err;
return ret;

return ret == 'C' ? FN_ERR_OK : FN_ERR_IO_ERROR;
}