Processor Complex Identification
Type 0 | Type 1 | Type 2 | Type 3 | Type 4


Base 0 / Type 0

Refdisk + Diags

-x0x "0 Minus" 386DX 20 MHz, FRU: 64F0782, FCC ID: ANO386201A

No L2 cache
Supports 1, 2 MB 85 ns (80 ns?)
8 MB FPM max (?), 24-bit DMA


-x0x 386DX 20 MHz, FRU: 04G3884, FCC ID: ANO38620C1A

64 KB 25 ns L2 cache
Supports 1, 2 MB 85 ns (80 ns?)
8 MB FPM max (?), 24-bit DMA


Base 1 / Type 1

Refdisk | Diags | BIOS

-xGx 486SX 20 MHz, FRU: 64F0201, FCC ID: ANOIBM486A20

No L2 cache connector
2, 4, 8 MB 70 ns FPM matched pairs
64 MB FPM max, 24-bit DMA
Some with bad DMA controller


-xJx 486DX 25 MHz, FRU: 64F0201, 84F8036, FCC ID: ANOIBM486A25
-xKx 486DX 33 MHz, FRU: 64F0198, 84F9356, FCC ID: ANOIBM486A33

2, 4, 8 MB FPM matched pairs
64 MB FPM max, 24-bit DMA
Some with bad DMA controller
Optional 256 KB 17 ns WT L2 cache
(L2 board FRU: 6451095, 64F0199)


Upgrade DX-50 486DX 50 MHz, FRU: 92F0048, FCC ID: ANOIBM486A50

2, 4, 8 MB FPM matched pairs
64 MB FPM max, 24-bit DMA
Some with bad DMA controller
Standard 256 KB 15 ns WT L2 cache
(L2 board FRU: 92F0050)


Upgrade DX2-66 486DX2 66 MHz, FRU: 92F0145, FCC ID: ANOIBM486B33

2, 4, 8 MB FPM matched pairs
64 MB FPM max
Flash based, supports >1 GB IML
Optional 256 KB 17 ns WT L2 cache
(L2 board FRU: 6451095, 64F0199)
No flash BIOS upgrade available


Base 2 / Type 2

Refdisk | Diags | BIOS

-xHx 486SX 25 MHz, FRU: 92F0079, FCC ID: ANOIBM486SXB25 (same as xLx)

No L2 cache
2, 4, 8 MB 70 ns FPM SIMMs
FPM single, matched, mixed pairs
64 MB FPM max, 24-bit DMA
Some with bad DMA controller


-xLx 486DX2 50 MHz, FRU: 92F0161, FCC ID: ANOIBM486SXB25 (same as xHx)

No L2 cache
2, 4, 8 MB 70 ns FPM SIMMs
FPM single, matched, mixed pairs
64 MB FPM max, 24-bit DMA
Some with bad DMA controller


Base 3 / Type 3

Refdisk | Diags | BIOS

-xMx 486DX 50 MHz, FRU: 82G2484, 57F1597, FCC ID: ANOIBM486B50

Two board construction
256 KB L2 WT cache
SIMMs in matched pairs
64 MB ECC -or- FPM max
32-bit DMA
Some with bad streamer support
Enhanced BIOS for >1 GB IML


Base 4 / Type 4

Refdisk | Diags | BIOS

-xNx 486DX2 66 MHz, FRU: 61G2343, FCC ID: ANOIBM486C66

128 KB L2 WB cache
169-pin Socket (LIF, 5 V)
SIMMs matched pairs
64 MB FPM -or- 256 MB ECC max
32-bit DMA
SynchroStream Controller
Some with bad streamer support


-xPx Pentium 60 MHz, FRU: 52G9362, 06H7324, FCC ID: ANOIBM586A60
-xQx Pentium 66 MHz, FRU: 92F0120, 06H7317, FCC ID: ANOIBM586A66

Revised board layout (xQx only?):

256 KB L2 WB cache
Socket 4 (LIF, 273 pins, 5 V)
SIMMs in matched pairs
64 MB FPM -or- 256 MB ECC max
32-bit DMA
SynchroStream Controller


-xYx Pentium 90 MHz, FRU: 06H3739, 06H7095, FCC ID: ANO06H3729

256 KB L2 WB cache
Socket 5 (LIF, 320 pins, 3.3 V)
SIMMs in matched pairs
64 MB FPM -or- 256 MB ECC max
32-bit DMA
SynchroStream Controller


None of the above? Also see Japanese PS/55 Processor Complexes HERE.


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