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DASD Storage Interface Specification Micro Channel (Rev. 2.2, Sep 1991)
8550 HDD Adapters
Direct Bus Attachment Pinout
WD387 60MB Drive PCB
160MB DBA-ESDI PCB
Direct Bus Attachment Pinout
The following table shows the signal assignment and pin numbering for the
2 x 36-pin hard drive edge connector. Side A of the connector is the top
(component side) and Side B is the bottom (solder side).
This is a subset of the standard Micro
Channel slot (16-bit).
| Pin | Dir | Signal | | Pin | Dir | Signal |
|---|
| A01 | O | -CD SETUP | B01 | O | A 15 |
| A02 | O | A 13 | B02 | O | A 14 |
| |
| A03 | — | Ground | B03 | — | Ground |
| A04 | O | A 11 | B04 | — | Reserved |
| A05 | O | A 10 | B05 | — | Ground |
| A06 | O | A 09 | B06 | O | A 12 |
| A07 | O | +5 Vdc | B07 | O | -CMD |
| A08 | O | A 08 | B08 | I | -CD SFDBK |
| A09 | O | A 07 | B09 | — | Ground |
| A10 | O | A 06 | B10 | I/O | D 01 |
| A11 | — | Ground | B11 | I/O | D 03 |
| A12 | O | A 05 | B12 | I/O | D 04 |
| A13 | O | A 04 | B13 | — | Ground |
| A14 | O | A 03 | B14 | O | CHRESET |
| A15 | O | +5 Vdc | B15 | I/O | D 08 |
| A16 | O | A 02 | B16 | I/O | D 09 |
| A17 | O | A 01 | B17 | — | Ground |
| A18 | O | A 00 | B18 | I/O | D 12 |
| A19 | O | +12 Vdc | B19 | I/O | D 14 |
| A20 | O | -ADL | B20 | I/O | D 15 |
| A21 | I | -PREEMPT | B21 | — | Ground |
| A22 | I | -BURST | B22 | I/O | D 00 |
| A23 | O | +5 Vdc | B23 | I/O | D 02 |
| A24 | I | ARB 00 | B24 | I/O | D 05 |
| A25 | I | ARB 01 | B25 | — | Ground |
| A26 | I | ARB 02 | B26 | I/O | D 06 |
| A27 | — | +12 Vdc | B27 | I/O | D 07 |
| A28 | I | ARB 03 | B28 | I/O | D 10 |
| A29 | O | ARB/-GNT | B29 | — | Ground |
| A30 | O | –TC | B30 | I/O | D 11 |
| A31 | — | +5 Vdc | B31 | I/O | D 13 |
| A32 | O | -S0 | B32 | O | -SBHE |
| A33 | O | -S1 | B33 | — | Ground |
| A34 | O | M/-IO | B34 | I | -CD DS 16 |
| A35 | — | Ground | B35 | I | -IRQ 14 |
| A36 | I | CD CHRDY | B36 | — | Ground |
There is a physical key between pins 2 and 3 (A02 and A03; B02 and B03).
Source:
WD387 60MB PCB
D15 Activity LED
J4 7x2-pin header (2 keys)
J7 2-pin header
J2 20-pin header
U3 SSI 32P541-CH Read Data Processor
U5 S80C31-1 MCU
U7 K1-230 microcode ROM?
U8 Hitachi HD64950CPB Hard Disk Ctrl.
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U17 HM6264ALFP-15T
U9 TC8564AF
U11 TC17G032AF 6127911
U15 P/N 6127914
Y1 16KSS0A
Y2 12AKSS0A
Y3 3.6DKSS0B
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160MB DBA-ESDI PCB 79F6370
There are no reference designators silkscreened on the PCB.
Modifying 160MB SCSI Drive With ESDI PCB
Modifying a 160 MB SCSI Disk was only half way successful (took of the SCSI
PCB and hooked up the ESDI PCB from my bad 120 MB Drive). I can see the HD when
booting with the Refdisk, but I get all kinds of errors when trying to format
it.
The 160 operates with a different number of sectors IIRC. Only have the data
for the 80 and 160MB: 984 cylinders, 10 heads, 17 (80) and 34 (160) sectors. So
the 120 must have 26 sectors (25.5 arithmetically - but there are no half
cylinders ...). I think the 120MB controller cannot "fetch" a valid sector
start ... and therefore jumps out. The LLFORMAT routine does not go *that* deep
that it can write raw sectors on the media. That's usually the purpose of some
factory tools.
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