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  • Witchy's Avatar
    March 5th, 2017, 11:26 AM
    Witchy replied to a thread 8085a CPU oddity in Other
    OK, that's fitted and working nicely, you'd think the board spacing had been designed with one in mind :) DRAMs have the right voltages now but no...
    8 replies | 312 view(s)
  • Witchy's Avatar
    March 2nd, 2017, 01:44 AM
    Witchy replied to a thread 8085a CPU oddity in Other
    Good call, I've ordered 2. There's plenty of room on the board to fit it in :) W
    8 replies | 312 view(s)
  • Witchy's Avatar
    March 1st, 2017, 02:41 PM
    Witchy replied to a thread 8085a CPU oddity in Other
    Turns out the -5V rail for the 4116 DRAMs is running at -4.2V which is below spec for both types of DRAM on the board. Given that that section of...
    8 replies | 312 view(s)
  • Witchy's Avatar
    March 1st, 2017, 12:55 AM
    Witchy replied to a thread 8085a CPU oddity in Other
    Morning folks, I checked the wiring diagram of this board I've been drawing out and HOLD is actually Vcc fed through an inverter so unless I've...
    8 replies | 312 view(s)
  • Witchy's Avatar
    February 28th, 2017, 02:58 AM
    Witchy replied to a thread 8085a CPU oddity in Other
    Good call on the current draw, I'll check tonight. I did try a new pair of LS373s that I'd bought for another project but the behaviour is still the...
    8 replies | 312 view(s)
  • Witchy's Avatar
    February 27th, 2017, 06:42 AM
    Witchy started a thread 8085a CPU oddity in Other
    Hi folks, I'm in the process of restoring an 8085a based phone system and got it to the point of fully testing its 32K RAM and running code to a...
    8 replies | 312 view(s)
  • Witchy's Avatar
    February 27th, 2017, 05:18 AM
    Nice one, I'll add those to my troubleshooting toolchest. I've written similar for an 8085 machine I'm working on but it's largely based on guesswork...
    5 replies | 275 view(s)
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About Witchy

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About Witchy
Biography:
Exiled northerner, owner of the Binary Dinosaurs Computer Museum
Location:
Flatlands, UK

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www.binarydinosaurs.co.uk - UK home computer history
Where RIFA capacitors come to die
facebook.com/binarydinosaurs

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