Compaq Prolinea Family Maintenance & Serice Manual page 20

processor.
The 586-based system boards support the 586 processor running at bus
frequencies of 50-MHz and 60-MHz.
Memory
All of the computers use 70ns enhanced page-mode DRAMs. Memory parity is
not supported.
The 486-based system boards accommodate a total of four double-sided
SIMMs. Either a single-sided 4 MB SIMM or 8 MB of soldered down DRAMs is
installed for base memory.
The 586-based system boards accommodate a total of six double-sided SIMMs.
Either two single-sided 4 MB SIMMs or two double-side 8 MB SIMMs are
installed for base memory.
Memory Expansion
The SIMM sockets on the 486-based system board can be populated with 4,
8, 16, or 32 MB SIMMs in any order. The SIMM sockets on the 586-based
system boards must be populated in pairs of equal size in sequential
slots. The SIMMs must be 70ns or faster.
IMPORTANT: SIMMS with tin-lead pins must be used for memory upgrades.
Cache
All of the computers support a second level write-back cache. 486DX2/XX
and 486DX4/100 models support an optional 128 KB or 256 KB cache board.
586 models support an integrated 256 KB cache.
Graphics
The Compaq ProLinea Family of Personal Computers is supported with a
2-tiered graphics strategy.
The 486-based system boards and selected 586-based system boards are
shipped with a PCI Local Bus integrated graphics controller. These system
boards are provided with 1 MB DRAM. Additional memory is provided with a
daughter card. The PCI Local Bus integrated graphics controller supports
the following maximum screen resolutions:
o 1024 x 768 x 256 colors with 1 MB DRAM
o 1280 x 1024 x 256 colors with 2 MB DRAM
Selected 586-based system boards are designed to be used with a QVision
2000+ Graphics Controller in a PCI slot. This will provide the following
maximum screen resolutions:
o 1280 x 1024 x 256 colors with 2 MB VRAM
o 1280 x 1024 x 16.7M colors with 4 MB VRAM