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i8271: slight improvement for the bbc (nw)

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cracyc 2015-09-30 21:31:39 -05:00
parent 94532c6549
commit 7ac63b89ec
2 changed files with 4 additions and 2 deletions
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4
src/devices/machine/i8271.c
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@ -98,6 +98,7 @@ void i8271_device::soft_reset()
rr = 0; rr = 0;
scan_sec = 0; scan_sec = 0;
moder = 0xc0; moder = 0xc0;
oport = 0;
scan_cnt[0] = scan_cnt[1] = 0; scan_cnt[0] = scan_cnt[1] = 0;
} }
@ -823,7 +824,7 @@ void i8271_device::start_command(int cmd)
break; break;
} }
case 0x23: case 0x23:
rr = (command[0] << 1) & 0xc0; rr = (command[0] & 0xc0) | oport;
break; break;
default: default:
rr = 0; rr = 0;
@ -863,6 +864,7 @@ void i8271_device::start_command(int cmd)
case 0x22: case 0x22:
break; break;
case 0x23: { case 0x23: {
oport = command[2] & ~0xc0;
floppy_info &fi = flopi[BIT(command[0], 7)]; floppy_info &fi = flopi[BIT(command[0], 7)];
fi.dev->dir_w(BIT(command[2], 2)); fi.dev->dir_w(BIT(command[2], 2));
fi.dev->stp_w(BIT(command[2], 1)); fi.dev->stp_w(BIT(command[2], 1));

2
src/devices/machine/i8271.h
View File

@ -209,7 +209,7 @@ private:
floppy_info flopi[2]; floppy_info flopi[2];
int command_pos, sectors_read, scan_len; int command_pos, sectors_read, scan_len;
UINT8 command[6], dma_data; UINT8 command[6], dma_data, oport;
UINT8 rr, scan_sec, moder; UINT8 rr, scan_sec, moder;
UINT8 precomp, perpmode, scan_cnt[2]; UINT8 precomp, perpmode, scan_cnt[2];
UINT8 srate, hset, icnt, hload; UINT8 srate, hset, icnt, hload;