IBM SCSI Adapters
MCA Signal Comparison Chart

From Peter:
   I've checked the used pins on my SCSI adapters. Here's a comparison chart. The old uncached adapter seems to be a 16-bit adapter in fact - but recognizes when it is used in a 32-bit slot. Funny little beasts. The later cached adapter does not use Address Parity (APAR), the old did - or has at least the option for that. Guess you will curse a lot on the table format, I've made it in Notepad (Ed. I did!).

SCSI-A = IBM FRU 15F6561 (20/25MHz crystals)
IBM FRU 85F0002 (12.5/20MHz crystals)
SCSI-B = IBM FRU 85F0000 (SCSI w. Cache / Old)
SCSI-C = IBM FRU 85F0063 (SCSI w. Cache / New)

Pin Signal A B C Pin Signal A B C
B01 AUDIO G - - - A01 -CD SETUP X X X
B02 AUDIO - - - A02  MADE 24 X X X
B03 GND X X X A03 GND X X X
B04 14.3MHz - - - A04 A11 X X X
B05 GND X X X A05 A10 X X X
B06 A23 X X X A06 A09 X X X
B07 A22 X X X A07 +5VDC X X X
B08 A21 X X X A08 A08 X X X
B09 GND X X X A09 A07 X X X
B10 A20 X X X A10 A06 X X X
B11 A19 X X X A11 +5VDC X X X
B12 A18 X X X A12 A05 X X X
B13 GND X X X A13 A04 X X X
B14 A17 X X X A14 A03 X X X
B15 A16 X X X A15 +5VDC X X X
B16 A15 X X X A16 A02 X X X
B17 GND X X X A17 A01 X X X
B18 A14 X X X A18 A00 X X X
B19 A13 X X X A19 +12VDC - - -
B20 A12 X X X A20 -ADL X X X
B21 GND X X X A21 -PREEMPT X X X
B22 -IRQ09 - - - A22 -BURST X X X
B23 -IRQ03 - - - A23 -12VDC - - -
B24 -IRQ04 - - - A24 ARB00 X X X
B25 GND X X X A25 ARB01 X X X
B26 -IRQ05 - - - A26 ARB02 X X X
B27 -IRQ06 - - - A27 -12VDC - - -
B28 -IRQ07 - - - A28 ARB03 X X X
B29 GND X X X A29 ARB/-GNT X X X
B30 -DAPAREN X - - A30 -TC - - -
B31 DPAR(0) X - - A31 +5VDC X X X
B32 -CHCK X X X A32 -SO X X X
B33 GND X X X A33 -S1 X X X
B34 -CMD X X X A34 M/-IO X X X
B35 CHRDYRTN X X X A35 +12VDC - - -
B36 -CDSFDBK X X X A36 CDCHRDY X X X
B37 GND X X X A37 D00 X X X
B38 D01 X X X A38 D02 X X X
B39 D03 X X X A39 +5VDC X X X
B40 D04 X X X A40 D05 X X X
B41 GND X X X A41 D06 X X X
B42 CHRESET X X X A42 D07 X X X
B43 -SDSTROBE - - - A43 GND X X X
B44 -SDR(0) - - - A44 -DS16RTN X X X
B45 GND X X X A45 -REFRESH X X X
B46 KEY       A46 KEY      
B47 KEY       A47 KEY      
B48 D08 X X X A48 +5VDC X X X
B49 D09 X X X A49 D10 X X X
B50 GND X X X A50 D11 X X X
B51 D12 X X X A51 D13 X X X
B52 D14 X X X A52 +12VDC - - -
B53 D15 X X X A53 DPAR(1) X - -
B54 GND X X X A54 -SBHE X X X
B55 -IRQ10 - - - A55 -CDDS16 X X X
B56 -IRQ11 - - - A56 +5VDC X X X
B57 -IRQ12 - - - A57 -IRQ14 X X X
B58 GND X X X A58 -IRQ15 - - -
B59 KEY       A59 KEY      
B60 KEY       A60 KEY      
B61 -SDR(1) - - - A61 GND X X X
B62 -MSDR - - - A62 RESERVED - - X
B63 GND X X X A63 RESERVED - - X
B64 D16 - X X A64 -SFDBKRTN - - X
B65 D17 - X X A65 +12VDC - X X
B66 D18 - X X A66 D19 - X X
B67 GND X X X A67 D20 - X X
B68 D22 - X X A68 D21 - X X
B69 D23 - X X A69 +5VDC X X X
B70 DPAR(2) - - - A70 D24 - X X
B71 GND X X X A71 D25 - X X
B72 D27 - X X A72 D26 - X X
B73 D28 - X X A73 +5VDC X X X
B74 D29 - X X A74 D30 - X X
B75 GND X X X A75 D31 - X X
B76 -BE0 - X X A76 DPAR(3) - - -
B77 -BE1 - X X A77 +12VDC X - X
B78 -BE2 - X X A78 -BE3 - X X
B79 GND X X X A79 -DS32RTN - X X
B80 TR32 - X X A80 -CDDS32 - - X
B81 A24 X X X A81 +5VDC X X X
B82 A25 X X X A82 A26 X X X
B83 GND X X X A83 A27 X X X
B84 A29 X X X A84 A28 X X X
B85 A30 X X X A85 +5VDC X X X
B86 A31 X X X A86 -APAREN X X -
B87 GND X X X A87 APAR(0) X X -
B88 APAR(2) X X - A88 APAR(1) X X -
B89 APAR(3) X X - A89 GND X X X

Content created and/or collected by:
Louis Ohland, Peter Wendt, William Walsh, Kevin Bowling, Jim Shorney, Tim Clarke, David Beem, Tatsuo Sunagawa, Tomáš Slavotínek, and many others.

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