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HIMEMV2 or equivillent PROM

ibmapc

Veteran Member
Joined
Apr 5, 2010
Messages
1,029
Location
Albany, OR USA
If your not familiar with the HIGHMEMV2, see the folowing View attachment 40433.It is a chip that replaces the rom in socket u44 on the IBM 5160 XT Motherboard to address memory up to 1 meg. I did the mod for 640KB on the motherboard about 25 years ago. So I have 256k chips in banks 0 and 1. I have enough 256k chips that I pulled from another board to fill the other two banks. I realize that the added memory will only give me about 64k of Contiguous base memory, but I believe there is a good size chunk of other unused memory between 640K and 1 Meg that could be used as UMB to load device drivers like Network drivers etc. using something like Quarterdeck Cram.
Chuck(G) had mentioned using a GAL to replace the rom, but I don't have the technical expertise to burn one properly. I'd be willing to pay for the chip plus shipping and any other costs incurred (within reason of coarse). I had also hi-jacked a thread in PC's AND CLONES that discussed this same topic, but that thread has gotten a little long and has not attracted much interest lately, so I decided a new thread here might get the right person or persons interested. Anyone willing to help me with this project, please PM me or E-mail me at gregsaling@comcast.net
I know this is an old post from 2011. I just thought I'd post here a link to some files to make this mod a little easier. View attachment 40434 View attachment 40435
 
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