8525-286 Planar

rs25286a.tg0 Model 25-286 Starter Disk v1.00 (zipped image)
25-286ad.exe Model 25-286 Advanced Diagnostics v1.0 (zipped image)

190-082 IBM PS/2 Model 25 286 (8525-006, G06, 036, G36)
187-148 IBM 8525, PS/2 Model 25
188-081 IBM PS/2 Model 25 LS
192-019 IBM PS/2 Model 25 SX (8525-K00, K01, L02)
188-083 PS/2 Model 25 20MB Fixed Disk Drive and 20MB Fixed Disk Drive with adapter
189-145 IBM PS/2 Model 25 720KB 1-Inch High Diskette Drive Option

8525-286 Planar
System Firmware
   ROM Images
Memory
Riser Card
8525-286 Earphone Riser
Memory Expansion Cards


8525-286 Planar

F1 KB/Mouse fuse
J1 Pointing-device connector
J2 Keyboard connector
J3 Parallel port
J4 Display connector
J5 Serial port
J6 Bus-adapter connector
J7 Power-supply connector
J9 Memory packs
J10 Optional memory packs
J11 Hard-disk drive connector
J12 Diskette-drive connector
J13 Password-override connector
J14 Power-supply connector
J15 Earphone?
SP1 Speaker
Y1 14.318 MHz osc
Y2 25.175 MHz osc
Y3 20.322 MHz osc
Y4 20 MHz osc
Y5 48.00000 MHz osc
ZM1 287-10 NPU Socket
ZM2 VLSI VL82C100
ZM3 VLSI VL82C102A
ZM4 VLSI VL82C103A
ZM5 VLSI VL82C104
ZM6 VLSI VL82C101B
ZM9 VLSI VL16C451
ZM14 27F4094 DISKGA
ZM18 15F6864 VGA
ZM19 NEC D765BC
ZM23 Inmos IMSG171P-35
ZM33 Intel 8042
ZM35 Clock module connector
ZM36 286-10 CPU
ZM46 EPROM
ZM47-54 64Kx4 DRAM (Video)


System Firmware (POST & BIOS)

Firmware stored in EPROM.

ROM Images

Old Planar

30F9580 / 30F9579 - 25 Aug 1988, rev. 0, 2x 27C512 (ZM11 / ZM12)

New Planar

27F4092 - 25 Aug 1988, rev. 0, TC531024P-15 (ZM46), same as above, only combined
33F5381 - 28 Jun 1989, rev. 2, TC531024P-15 (ZM46)
33F5540 - same parameters and contents as above


Memory

30 pin SIMM 100-150 ns w. parity
Min/Max on system board: 512/4MB (16MB using adapter cards)


Riser Card


8525-286 Earphone Riser

L1 TDK ZJY-2P

Three conductors, Red, White, Black.


Memory Expansion Cards

Limitations: The ability to use a non-IBM memory expansion card in the Model 25 286 is dependent on the flexibility of the card in establishing its starting memory address. The amount of planar memory (standard plus kits) and the corresponding starting memory address is as follows:

Planar Memory Expansion Card
Starting Address
512KB 512KB
1MB 1MB +384KB
2MB 2MB +384KB
4MB 4MB +384KB

Memory expansion cards must support the listed starting address to properly operate in a system with a given amount of planar memory.

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

Ardent Tool of Capitalism - MAD Edition! is maintained by Tomáš Slavotínek.
Last update: 19 Nov 2021 - Changes & Credits | Legal Info & Contact