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

Add a Victor V86P disk driver

Browse Source 
This emulates a JVC-branded controller/drive pair, using RLL encoding,
connected via a small connector electrically compatible with ST-506.

The controller is ST-506 compatible with an extra command for
self-power-off. The option ROM is made by SMS. Commented disassembly is
available for study [1].

The disk is a 3.5" 20MiB "made by Victor", labeled JD3824T100 on the outer
protective casing, JD3824T00-1 on the actual drive. It's 615/2/34
physically, pretends to be a 614/4/17 so that it's type 3 compatible.

[1] https://archive.org/details/v86p-hd
This commit is contained in:
Lubomir Rintel
2021-09-09 15:39:26 +02:00
parent da33f5c0cc
commit b20e72f37f
3 changed files with 78 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

1
src/disk/hdc.c
View File

@@ -115,6 +115,7 @@ static const struct {
{ &st506_xt_wd1002a_27x_device },
{ &st506_xt_wd1004_27x_device },
{ &st506_xt_wd1004a_27x_device },
{ &st506_xt_victor_v86p_device },
{ &esdi_at_wd1007vse1_device },
{ &ide_isa_device },
{ &ide_isa_2ch_device },

76
src/disk/hdc_st506_xt.c
View File

@@ -99,6 +99,7 @@
#define WD1002A_27X_BIOS_FILE "roms/hdd/st506/wd1002a_27x-62-000094-032.bin"
#define WD1004_27X_BIOS_FILE "roms/hdd/st506/western_digital_WD1004A-27X.bin"
#define WD1004A_27X_BIOS_FILE "roms/hdd/st506/western_digital_WD1004A-27X.bin"
#define VICTOR_V86P_BIOS_FILE "roms/machines/v86p/2793VG.10010688.rom"
#define ST506_TIME (250 * TIMER_USEC)
#define ST506_TIME_MS (1000 * TIMER_USEC)
@@ -182,6 +183,7 @@
#define CMD_WRITE_BUFFER 0x0f
#define CMD_ALT_TRACK 0x11
#define CMD_INQUIRY_ST11 0x12 /* ST-11 BIOS */
#define CMD_V86P_POWEROFF 0x1a /* Victor V86P */
#define CMD_RAM_DIAGNOSTIC 0xe0
/* reserved 0xe1 */
/* reserved 0xe2 */
@@ -819,6 +821,29 @@ st506_callback(void *priv)
/* For a 615/4/26 we get 666/2/31 geometry. */
st506_xt_log("ST506: drive%i: cyls=%i, heads=%i\n",
dev->drive_sel, drive->cfg_cyl, drive->cfg_hpc);
if (dev->type == 23 && drive->cfg_hpc == 2) {
/*
* On Victor V86P, there's a disagreement between
* the physical geometry, what the controller
* pretends it to be, and what the BIOS uses.
*
* The disk physically has 2/34 heads/sectors per
* track, but it is treated as 4/17 in order to
* look like a regular type 3 drive (see [1],
* line 1859). The controller accepts the 4/17
* geometry, so this should not really matter.
*
* However, the BIOS issues SPECIFY (see [1],
* line 2089) with head count of two. Let's
* hardwire the correct number instead, just like
* the real hardware seems to.
*
* [1] https://archive.org/download/v86p-hd/V86P-HD.TXT
*/
drive->cfg_hpc = 4;
st506_xt_log("ST506: drive%i: corrected to heads=%i\n",
dev->drive_sel, drive->cfg_hpc);
}
st506_complete(dev);
break;
}
@@ -949,6 +974,34 @@ st506_callback(void *priv)
}
break;
case CMD_V86P_POWEROFF:
if (dev->type == 23) {
/*
* Main BIOS (not the option ROM on disk) issues this.
* Not much we can do, since we don't have a physical disk
* to spin down, but handle this anyways so that we log
* something more reasonable than "unknown command".
*
* Entirely undocumented, but this is what's been observed:
* BIOS setting | Command sent
* 1 minutes | 1a 00 00 0c 02 00
* 2 minutes | 1a 00 00 18 02 00
* 3 minutes | 1a 00 00 24 02 00
* 4 minutes | 1a 00 00 30 02 00
* 5 minutes | 1a 00 00 3c 02 00
* off | 1a 00 00 00 02 00
*/
if (dev->command[3])
st506_xt_log("ST506: Auto power-off in %d seconds (type=%i)\n",
dev->command[3] * 5, dev->type);
else
st506_xt_log("ST506: Auto power-off disabled (type=%i)\n", dev->type);
} else {
st506_error(dev, ERR_BAD_COMMAND);
}
st506_complete(dev);
break;
case CMD_RAM_DIAGNOSTIC:
#ifdef ENABLE_ST506_XT_LOG
st506_xt_log("ST506: RAM_DIAG\n");
@@ -1485,6 +1538,9 @@ st506_init(const device_t *info)
dev->switches |= 0x40;
dev->bios_addr = device_get_config_hex20("bios_addr");
break;
case 23: /* Victor V86P (RLL) */
fn = VICTOR_V86P_BIOS_FILE;
break;
}
/* Load the ROM BIOS. */
@@ -1605,6 +1661,12 @@ wd1004a_27x_available(void)
return (rom_present(WD1004A_27X_BIOS_FILE));
}
static int
victor_v86p_available(void)
{
return (rom_present(VICTOR_V86P_BIOS_FILE));
}
// clang-format off
static const device_config_t dtc_config[] = {
{
@@ -2036,3 +2098,17 @@ const device_t st506_xt_wd1004a_27x_device = {
.force_redraw = NULL,
.config = wd_rll_config
};
const device_t st506_xt_victor_v86p_device = {
.name = "Victor V86P RLL Fixed Disk Adapter",
.internal_name = "st506_xt_victor_v86p",
.flags = DEVICE_ISA,
.local = (HDD_BUS_MFM << 8) | 23,
.init = st506_init,
.close = st506_close,
.reset = NULL,
{ .available = victor_v86p_available },
.speed_changed = NULL,
.force_redraw = NULL,
.config = NULL
};

1
src/include/86box/hdc.h
View File

@@ -40,6 +40,7 @@ extern const device_t st506_at_wd1003_device; /* st506_at_wd1003 */
extern const device_t st506_xt_wd1004a_wx1_device; /* st506_xt_wd1004a_wx1 */
extern const device_t st506_xt_wd1004_27x_device; /* st506_xt_wd1004_27x */
extern const device_t st506_xt_wd1004a_27x_device; /* st506_xt_wd1004a_27x */
extern const device_t st506_xt_victor_v86p_device; /* st506_xt_victor_v86p */
extern const device_t esdi_at_wd1007vse1_device; /* esdi_at */
extern const device_t esdi_ps2_device; /* esdi_mca */