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Better implementation of FDC 'not found' errors - can now distinguish missing

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address mark (eg disc not present or track not formatted), sector not found,
wrong cylinder and bad cylinder.
This commit is contained in:
SarahW 2020-03-04 22:03:08 +00:00
commit 38f19f7c9f
6 changed files with 106 additions and 26 deletions
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36
src/fdc.c
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@ -5,12 +5,23 @@
#include "disc.h"
#include "disc_sector.h"
#include "dma.h"
#include "fdc.h"
#include "fdd.h"
#include "io.h"
#include "pic.h"
#include "timer.h"
#include "x86.h"
#define ST1_DE (1 << 5)
#define ST1_ND (1 << 2)
#define ST1_NW (1 << 1)
#define ST1_MA (1 << 0)
#define ST2_DD (1 << 5)
#define ST2_WC (1 << 4) /*Wrong cylinder*/
#define ST2_BC (1 << 1) /*Bad cylinder*/
#define ST2_MD (1 << 0)
static int fdc_reset_stat = 0;
/*FDC*/
typedef struct FDC
@ -790,7 +801,6 @@ uint8_t fdc_read(uint16_t addr, void *priv)
void fdc_callback()
{
int temp;
int doseek = 0;
int drive;
// pclog("fdc_callback %i\n", discint);
@ -1187,15 +1197,33 @@ void fdc_finishread()
// rpclog("fdc_finishread\n");
}
void fdc_notfound()
void fdc_notfound(int reason)
{
// pclog("fdc_notfound: reason=%i\n", reason);
timer_disable(&fdc.timer);
fdc_int();
fdc.stat=0xD0;
fdc.res[4]=0x40|(fdc.head?4:0)|fdc.drive;
fdc.res[5]=5;
fdc.res[6]=0;
switch (reason)
{
case FDC_STATUS_AM_NOT_FOUND:
fdc.res[5] = ST1_ND | ST1_MA;
fdc.res[6] = 0;
break;
case FDC_STATUS_NOT_FOUND:
fdc.res[5] = ST1_ND;
fdc.res[6] = 0;
break;
case FDC_STATUS_WRONG_CYLINDER:
fdc.res[5] = ST1_ND;
fdc.res[6] = ST2_WC;
break;
case FDC_STATUS_BAD_CYLINDER:
fdc.res[5] = ST1_ND;
fdc.res[6] = ST2_WC | ST2_BC;
break;
}
fdc.res[7] = fdc.rw_track;
fdc.res[8] = fdc.head;
fdc.res[9] = fdc.sector;