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// Retro Vintage Connectors

MCA Bus IBM PS/2

MCA (Micro Channel Architecture) is IBM proprietary bus for PS/2 computers from 1987, with 32-bit data and address bus, bus mastering, and automatic card configuration but incompatible with ISA cards.

// Specifications
Standard
IBM MCA
Data Bus
16 or 32-bit
Address
32-bit
Speed
Up to 40 MB/s
Status
Obsolete proprietary IBM
Use Case
IBM PS/2 Models 50 60 70 80 server expansion cards
// Pin Reference Table
Pin Name Function Type
1 GND Ground GND
2 CD_SETUP Card setup I/O
3 GND Ground GND
4 /CD_SFDBK Setup feedback I/O
5 +5V 5V power PWR
6 D0 Data bit 0 I/O
7 D1 Data bit 1 I/O
58 A31 Address bit 31 I/O