Hi Louis !

Have checked the used pins on my 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 ... :-)  Have written it with Notepad ... (Ed. I did.)

Used Adapter Signals on MCA Connector
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