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CPU-World — IBM 80386 Microprocessor Family (info & photos)
The New York Times — I.B.M. Making A 386 Chip
The UCA 386 Adapter now supports AMD & IBM 386s
Introduction
Known Parts
The information presented here was provided by David Beem. Thanks!
Introduction
IBM was helping Intel (and themselves, because it only alleviated Intel not
needing to supply CPUs for some Model 70 and 80 systems) with the production of
the 386DX processors — mostly at a time of the 20 and 25 MHz rated
parts.
Because the CPU Reset Signatures match the Intel versions (including the
only 0304h signature I have ever seen; I don't believe that Intel had
identified that level in their datasheet information either), IBM likely used
Intel's masks as-is.
Known Parts
| P/N | CPUID/Stepping | Frequency |
|---|
| 23F7189 | CPUID 0304h (C Step) | 16 or 20 MHz? |
| 51F1783 | likely a CPUID 0304h (C Step) or (Step D0)? | 16 or 20 MHz? |
| 51F1784 | likely a CPUID 0305h (D0 Step) | 20 MHz |
| 51F0352 | an unknown stepping | 20 MHz |
| 32G3366 | an unknown stepping | 25 MHz |
| 51F1797 | CPUID 0305h (D0 Step) | 25 MHz |
| 63F7615 | CPUID 0305h (D0 Step) | 25 MHz |
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