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  • gekaufman's Avatar
    June 18th, 2019, 06:51 PM
    I located my spare PB10 87xx adapter board, a picture is attached. This board supported 8751's, 7742's, 8748's, 8755's etc. I believe it was a...
    8 replies | 298 view(s)
  • gekaufman's Avatar
    June 6th, 2019, 07:26 AM
    Dwight - I do have an 8748 adapter, but no schematic. I think I have a spare, but couldn't easily locate it last night. I'll keep looking, if I...
    8 replies | 298 view(s)
  • gekaufman's Avatar
    June 4th, 2019, 05:47 PM
    I found a print-out of the schematic. The original file might be on one of the 5.25" disks but I'll have to pull out an older system to look. I...
    8 replies | 298 view(s)
  • gekaufman's Avatar
    June 4th, 2019, 10:28 AM
    I’m pretty sure that Needham did release the schematic for the PB10. They were a great company to deal with, but sadly no longer in business (the...
    8 replies | 298 view(s)
  • gekaufman's Avatar
    June 4th, 2019, 08:39 AM
    Interesting parts, also equivalent to WS57C49, very fast. Looks like they were really intended to replace bipolar proms as the pinout Is different.
    29 replies | 811 view(s)
  • gekaufman's Avatar
    June 3rd, 2019, 06:23 PM
    I've never heard of/seen the 68765. Does it exist? The Needham's EMP30/31 and BK867C will handle the 68764 and 68766.
    29 replies | 811 view(s)
  • gekaufman's Avatar
    June 3rd, 2019, 11:53 AM
    If you have a way to program them, the Motorola type 68764 or 68766's are an 8Kx8 EPROM that will directly substitute for many mask ROMs.
    29 replies | 811 view(s)
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About gekaufman

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About gekaufman
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