Reply 40 of 48, by feipoa
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- l33t++
Thanks a lot! You have confirmed my suspicion, which I have now tested for.
Unfortunately, I didn't have any parity 256K modules, so I also tested with 4x 1 MB modules. I found that the RAMpAT board was more likely to read the full 16 MB when installed using 9-chip modules, rather than 3-chip. With the 3-chips, I was sometimes getting 12160K or 8192K detected.
I do not quite follow the numbers on the RAMpAT config file.
It looks like config is counting the existing motherboard memory as 4096K - BIOS SHADOW (64K) - VGA SHADOW (32K) - SCSI SHADOW (32K) = 3968K. But then why is the "next starting address" at 4352K? Should be at 4096K (I think).
Furthermore, the config utility then looks to be eliminating all of the motherboard's system memory except for 640K conventional, then adding the RAMpAT amount (16384K) minus 128K = 16896 K total memory. Complicating matters, the DOS mem command shows 15872K total memory. Is anyone able to make sense of this?
I ran Windows 3.11 IE5, loaded google, with the 16 MB on the RAMpAT. No issues there.
Ran a DOOM/Quake comparison with and without the RAMpAT
16 MB w/RAMpAT
DOOM = 21.28 fps
Quake = 2.5 fps
16 MB on motherboard only
DOOM = 21.57 fps
Quake = 3.1 fps
Rests were run on a SiS Rabbit board with an IBM BL3-100 (3x66) and ISA at 13.3 MHz. Graphics was GD5434 ISA.
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