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na103's latest activity

  • na103
    na103 replied to the thread Rainbow 100A Memory beyond 256K?.
    Is my opinion that RAMbow could be an all-in-one board consisting of the memory card + 8087 adapter. in the article it says that it was...
  • na103
    na103 replied to the thread Rainbow 100A Memory beyond 256K?.
    Hi, I'm joining this interesting brainstorming by adding some information about the DM74S287N PROM. in my remake it was replaced with a...
    • 1712653383949.png
  • na103
    na103 reacted to N. Brown's post in the thread Rainbow 100A Memory beyond 256K? with Like Like.
    Yes you want the rainbow 100A and 100+ to thing it still has a A type memory expansion card. A19 is used on the 100B for memory...
  • na103
    na103 reacted to N. Brown's post in the thread 8087 on DEC Rainbow 100A with Like Like.
    DEC part number PC1XX-AK is really a Memory Expansion Adapter with the unused option for a 8087 Numeric Co processor. Dec PCB number...
  • na103
    na103 reacted to alitel's post in the thread 8087 on DEC Rainbow 100A with Like Like.
    Hi Nicola, Resurrecting an old thread here -- I just had it explained to me how this works on a 100A -- I am EXTREMELY keen to acquire...
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