Ardent Tool of Capitalism

Your go-to destination for everything IBM PS/2 and Micro Channel

Processor Complex Identification

Type 0 | Type 1 | Type 2 | Type 3 | Type 4

"Type 0 Minus" 386DX 20 MHz, FRU P/N 64F0782, FCC ID ANO386201A
	No L2 cache 1 or 2 MB 85 ns (80 ns?), 4 SIMMs max 8 MB parity max (+8 MB on channel) 24-bit DMA

"Type 0 Plus" 386DX 20 MHz, FRU P/N 04G3884, FCC ID ANO38620C1A
	64 KB 25 ns L2 cache 1 or 2 MB 85 ns (80 ns?), 4 SIMMs max 8 MB parity max (+8 MB on channel) 24-bit DMA

Base 1 / Type 1

Refdisk | Diags | BIOS

-xGx 486SX 20 MHz, FRU P/N 92F0049, FCC ID ANOIBM486A20
	No L2 cache connector 2, 4, 8 MB 70 ns parity matched pairs 64 MB parity max, 24-bit DMA Some with bad DMA controller

-xJx 486DX 25 MHz, FRU P/N 64F0201, 84F8036, FCC ID ANOIBM486A25 -xKx 486DX 33 MHz, FRU P/N 64F0198, 84F9356, FCC ID ANOIBM486A33
	2, 4, 8 MB parity matched pairs 64 MB parity max, 24-bit DMA Some with bad DMA controller Optional 256 KB 17 ns WT L2 cache (L2 board FRU P/N 6451095, 64F0199)

Upgrade DX-50 486DX 50 MHz, FRU P/N 92F0048, FCC ID ANOIBM486A50
	2, 4, 8 MB parity matched pairs 64 MB parity max, 24-bit DMA Some with bad DMA controller Standard 256 KB 15 ns WT L2 cache (L2 board FRU P/N 92F0050)

Upgrade DX2-66 486DX2 66 MHz, FRU P/N 92F0145, FCC ID ANOIBM486B33
	2, 4, 8 MB parity matched pairs 64 MB parity max Optional 256 KB 17 ns WT L2 cache (L2 board FRU P/N 6451095, 64F0199) Flash based, supports >1 GB IML

Base 2 / Type 2

Refdisk | Diags | BIOS

-xHx 486SX 25 MHz, FRU P/N 92F0079, FCC ID ANOIBM486SXB25 (same as xLx)
	No L2 cache 2, 4, 8 MB 70 ns parity SIMMs parity single, matched, mixed pairs 64 MB parity max, 24-bit DMA Some with bad DMA controller

-xLx 486DX2 50 MHz, FRU P/N 92F0161, FCC ID ANOIBM486SXB25 (same as xHx)
	No L2 cache 2, 4, 8 MB 70 ns parity SIMMs parity single, matched, mixed pairs 64 MB parity max, 24-bit DMA Some with bad DMA controller

Base 3 / Type 3

Refdisk | Diags | BIOS

-xMx 486DX 50 MHz, FRU P/N 82G2484, 57F1597, FCC ID ANOIBM486B50
	Two board construction 256 KB L2 WT cache SIMMs in matched pairs 64 MB ECC -or- 64 MB parity max 32-bit DMA Some with bad streamer support

Base 4 / Type 4

Refdisk | Diags | BIOS

-xNx 486DX2 66 MHz, FRU P/N 61G2343, FCC ID ANOIBM486C33
	128 KB L2 WB cache 169-pin Socket (LIF, 5 V) SIMMs matched pairs 64 MB parity -or- 256 MB ECC max 32-bit DMA SynchroStream Controller

-xPx Pentium 60 MHz, FRU P/N 52G9362, 06H7324, FCC ID ANOIBM586A60 -xQx Pentium 66 MHz, FRU P/N 92F0120, 06H7317, FCC ID ANOIBM586A66 \|
	256 KB L2 WB cache Socket 4 (LIF, 5 V) SIMMs in matched pairs 64 MB parity -or- 256 MB ECC max 32-bit DMA SynchroStream Controller Two different PCB layouts

-xYx Pentium 90 MHz, FRU P/N 06H3739, 06H7095, FCC ID ANO6H3729
	256 KB L2 WB cache Socket 5 (LIF, 3.3 V) SIMMs in matched pairs 64 MB parity -or- 256 MB ECC max 32-bit DMA SynchroStream Controller

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

Content created and/or collected by:
Louis F. Ohland, Peter H. Wendt, David L. Beem, William R. Walsh, Tatsuo Sunagawa, Tomáš Slavotínek, Jim Shorney, Tim N. Clarke, Kevin Bowling, and many others.

Ardent Tool of Capitalism is maintained by Tomáš Slavotínek.
Last update: 05 Apr 2025 - Changelog | About | Legal & Contact