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IBM PS/1 User Manual

IBM PS/1
304 pages
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Page #21 background image
Two 72-pin system memory sockets (one is populated with
either a 2MB or 4MB SIMM). Memory speed is 70 ns.
Maximum memory is 32MB. Refer to “System Memory” on
page 1-20 and to “System Board Layouts” on page 5-2.
512K video RAM soldered on the system board (not field
upgradeable).
Ports include: two serial, parallel, keyboard, mouse, and video.
Connectors for AT riser card (120-pin), input power (12-pin), AT
diskette drives (34-pin), IDE AT hard disk drives (40-pin), and
power LED/hard disk LED (4-pin).
Lithium battery.
486SX—33MHz processor (72-pin memory SIMM)
Three system boards available:
1. 2MB SIMM for system memory, 128K external cache, upgrade
processor socket. Refer to “System Memory” on page 1-20
and to “System Board Layouts” on page 5-2.
2. 4MB SIMM for system memory, 128K external cache, upgrade
processor socket.
3. 4MB SIMM for system memory, 0 external cache, upgrade
processor socket.
Each system board contains:
Supports 8K internal cache.
Supports 0, 128K, or 256K external cache (field upgradeable).
Shipped with 0 or 128K standard.
Two or four 72-pin system memory sockets (one is populated
with either a 2MB or 4MB SIMM). Memory speed is 70 ns.
Maximum memory is 32MB or 64MB (depending on the
number of SIMM sockets). Refer to “System Memory” on
page 1-20 and to “System Board Layouts” on page 5-2.
1MB video RAM soldered on the system board (not field
upgradeable).
Ports include: two serial, parallel, keyboard, mouse, and video.
Connectors for AT riser card (120-pin), input power (12-pin), AT
diskette drives (34-pin), IDE AT hard disk drives (40-pin),
power LED/hard disk LED (4-pin), and video feature (26-pin).
Lithium battery.
486DX—33MHz processor (72-pin memory SIMM)
Two system boards available:
1. 238-pin processor socket
General Information 1-7

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IBM PS/1 Specifications

General IconGeneral
ProcessorIntel 80286 or 80386
Processor Speed10 MHz (80286)
RAM1 MB (expandable to 2 MB or more)
Storage40 MB hard drive
Floppy Drive3.5" 1.44 MB
GraphicsVGA
PortsSerial, Parallel, Mouse

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