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AltairZ80: IBC: Fix MCC hard disk command mask.

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Howard M. Harte 2023-04-29 17:04:32 -07:00 • committed by Paul Koning
parent d2b663ec94
commit 2c6ad66acd
1 changed files with 3 additions and 2 deletions
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5
AltairZ80/ibc_mcc_hdc.c
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@ -71,6 +71,7 @@
#define IBC_HDC_ERROR_ID_NOT_FOUND (1 << 4) #define IBC_HDC_ERROR_ID_NOT_FOUND (1 << 4)
#define IBC_HDC_CMD_MASK 0x7f
#define IBC_HDC_CMD_RESET 0x00 #define IBC_HDC_CMD_RESET 0x00
#define IBC_HDC_CMD_READ_SECT 0x01 #define IBC_HDC_CMD_READ_SECT 0x01
#define IBC_HDC_CMD_WRITE_SECT 0x02 #define IBC_HDC_CMD_WRITE_SECT 0x02
@ -403,7 +404,7 @@ static uint8 IBC_HDC_Write(const uint32 Addr, uint8 cData)
ibc_hdc_info->taskfile[TF_DRIVE] = ibc_hdc_info->reg_temp_holding[1]; ibc_hdc_info->taskfile[TF_DRIVE] = ibc_hdc_info->reg_temp_holding[1];
ibc_hdc_info->taskfile[TF_TRKL] = ibc_hdc_info->reg_temp_holding[2]; ibc_hdc_info->taskfile[TF_TRKL] = ibc_hdc_info->reg_temp_holding[2];
ibc_hdc_info->taskfile[TF_TRKH] = ibc_hdc_info->reg_temp_holding[3]; ibc_hdc_info->taskfile[TF_TRKH] = ibc_hdc_info->reg_temp_holding[3];
if ((ibc_hdc_info->taskfile[TF_CMD] & 0x80) != IBC_HDC_CMD_READ_PARAMETERS) { if ((ibc_hdc_info->taskfile[TF_CMD] & IBC_HDC_CMD_MASK) != IBC_HDC_CMD_READ_PARAMETERS) {
ibc_hdc_info->sel_drive = ibc_hdc_info->taskfile[TF_DRIVE] & 0x03; ibc_hdc_info->sel_drive = ibc_hdc_info->taskfile[TF_DRIVE] & 0x03;
} }
ibc_hdc_info->status_reg = 0x30; ibc_hdc_info->status_reg = 0x30;
@ -533,7 +534,7 @@ static t_stat IBC_HDC_doCommand(void)
{ {
t_stat r = SCPE_OK; t_stat r = SCPE_OK;
IBC_HDC_DRIVE_INFO* pDrive = &ibc_hdc_info->drive[ibc_hdc_info->sel_drive]; IBC_HDC_DRIVE_INFO* pDrive = &ibc_hdc_info->drive[ibc_hdc_info->sel_drive];
uint8 cmd = ibc_hdc_info->taskfile[TF_CMD] & 0x7F; uint8 cmd = ibc_hdc_info->taskfile[TF_CMD] & IBC_HDC_CMD_MASK;
pDrive->cur_cyl = ibc_hdc_info->taskfile[TF_TRKH] << 8; pDrive->cur_cyl = ibc_hdc_info->taskfile[TF_TRKH] << 8;
pDrive->cur_cyl |= ibc_hdc_info->taskfile[TF_TRKL]; pDrive->cur_cyl |= ibc_hdc_info->taskfile[TF_TRKL];