DTK Apex 386/33, User Manual

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2-2 PEM-3300 Motherboard
If your motherboard is the PEM-3300, the layout of your board be as
pictured on the next page.
The PEM-3300 motherboard uses a cache memory subsystem provid-
ing a small amount of fast memory (SRAM) and a large amount of slow
memory (DRAM). This system is configured to so that all system
memory is fast memory — fast enough to complete bus cycles with no
wait states. The cache memory provides high performance with no wait
states. The cache memory provides high performance with a cost
approaching that of DRAM.
The motherboard contains a Intel
®
80386 processor, a 80387 math
coprocessor socket, BIOS chips and expansion slots. The figure on the
next page will familiarize you with the layout of the PEM-3300 Cache-
386 33MHz Mainboard.
Restrictions
Before installing the PEM-3300, we strongly recommend that you
follow the restrictions mentioned below:
Access Time:
l
27256 EPROM (BIOS) with 150ns access time
l
1MbitX9 SIP DRAM with 100ns access time
l
256KbitX9 SIP DRAM with 80ns access time
l
256KbitX4 DIP DRAM with 100ns access time
. 256KbitXl DIP DRAM with 80ns access time
l
16Kbit X 4 DIP Cache RAM (SRAM) with 20ns access time
l
All the SIP RAM modules must have leads
22 Chapter 2: Setting Up Your System