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IBM PS/2 FAQ | Do all PS/2s have MCA?  


The answer is "No". IBM PS/2 Models lower than 50 are ISA bus. All PS/2s 
Model 50 and above are the more superior Micro Channel bus. Here is a nice ASCII chart of all models:
 
      Model ??        |            Bus 
-----------------------------------------------
  Model 25            |        ISA 8-bit
  Model 25-286    |        ISA 16-bit
  Model 25SX      |        ISA 16-bit
  Model 30            |        ISA 8-bit
  Model 30-286    |        ISA 16-bit
  PS/2 E(9533)    |        ISA 16-bit
  Model 35SX      |        ISA 16-bit
  Model 40SX      |        ISA 16-bit
  Model L40SX    |        ISA 16-bit
  Model N45SX    |        ISA 16-bit
  Model 50            |        MCA 16-bit
  Model N51         |        MCA 16-bit
  Model 55SX      |        MCA 16-bit
  Model 56            |        MCA 16-bit
  Model 57            |        MCA 16-bit
  Model CL57       |        MCA 16-bit
  Model 65SX      |        MCA 16-bit
  Model 70            |        MCA 32-bit
  Model P70         |        MCA 32-bit
  Model P75         |        MCA 32-bit
  Model 76            |        MCA 32-bit
  Model 77            |        MCA 32-bit
  Model 80            |        MCA 32-bit
  Model 85            |        MCA 32-bit
  Model 90            |        MCA 32-bit
  Model 95            |        MCA 32-bit
  Model 195          |        MCA 32-bit
  Model 295          |        MCA 32-bit
  PC Server 500  |        MCA 32-bit 
 
Last updated: 2-12-98