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I have two 8mb sticks that bios recognizes as 4mb each
You are noting that each memory module is actually 8 MB but is recognized as only 4 MB?
Or the modules are 4 MB each, total 8 MB?
Yes, some brands did have a bit of on-board main memory. A carry-over from the 8088 age where 1 MB was maximum main memory.
Older systems such as this use only single-density memory types. Double-density would not be recognized for what they are.
Single density refers to one layer of memory pages.. double density refers to two layers of pages, stacked like a sandwich.
There are some 20 pin DIPP chip sockets at the upper corner of the board image.. that should be the on-board cache memory.
There is some cache memory on the CPU die, but external cache memory is on the board. Typical external amounts are 128KB, 256KB or 512KB. The on-die cache may be only 32KB. Finding additional cache memory for this older board may be near impossible.
The CPU has the marking "486ODPR75" on it.. indicating it is rated at 75 MHz max speed. Perhaps the diagnostics program does not truly recognize the true speed.
There are two Web sites which may have more info about this board.
http://stason.org/TULARC/pc/motherboards/http://www.elhvb.com/