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This article is from the 3b1 computers FAQ, by John B. Bunch with numerous contributions by others.

5.3. Can I really get 4MB of memory, even with a 1.5MB combo card, 512K RAM card, and 2MB of RAM on the motherboard?

The answer is yes. It does require a simple pin-ectomy. You need to fool the hardware to think the 512K RAM card is in a slot that doesn't physically exist on the UNIX PC. For more information on how to do this, grab John Milton's HwNote06 from the archive sites.

 

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pc, hardware, video, AT&T UNIX PC, PC7300, and 3B1, faq, frequently asked questions, repair, computer, card