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Thread: SaRuMan - 64k static RAM for DRAM replacement board

  1. #11
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    Quote Originally Posted by eslapion View Post
    Ray Carlsen has used on of my modules to replace all 8 DRAM ICs on an older board 250407.

    Attachment 150716

    The 8 DRAM chips needed about 240mA of power in all. The single module now uses less than 5mA.
    Interesting. I have two 250407 breadbins needing a ram replacement. Is it possible to have a schematic of all the connections?

  2. #12
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    Quote Originally Posted by Dataquarters View Post
    Quote Originally Posted by eslapion View Post
    Ray Carlsen has used on of my modules to replace all 8 DRAM ICs on an older board 250407.

    The 8 DRAM chips needed about 240mA of power in all. The single module now uses less than 5mA.
    Interesting. I have two 250407 breadbins needing a ram replacement. Is it possible to have a schematic of all the connections?
    This custom configuration was done by Ray Carlsen so I suggest you contact him.

    However, it's clear this arrangement was done simply by comparing the pinout of 41464 DRAMs vs 4164 DRAMs used on board 250407 and earlier. Anyone with a bit of knowledge in electronics should be able to do it easily.

  3. #13
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    New lower price!

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    Quote Originally Posted by eslapion View Post
    New lower price!
    A week after my purchase. Just my luck, hehehehehe.

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    Quote Originally Posted by Dataquarters View Post
    Quote Originally Posted by eslapion View Post
    New lower price!
    A week after my purchase. Just my luck, hehehehehe.
    I refunded you the difference.
    Last edited by eslapion; 15th November 2019 at 16:41. Reason: change of direction!

  6. #16
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    Quote Originally Posted by eslapion View Post
    Quote Originally Posted by Dataquarters View Post
    Quote Originally Posted by eslapion View Post
    New lower price!
    A week after my purchase. Just my luck, hehehehehe.
    I refunded you the difference.
    Wow, thank you. I didn't expect it and, honestly, you didn't have to. You are free to lower your prices whenever the circumstances allow you to do so. Anyway, thanks again. 'Til next purchase!

  7. #17
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    Seemed to be the honest thing to do... glad to know you like it!

  8. #18
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    Declaring interest for a couple of these, shipping to Alberta, Canada.

    Thanks
    Thomas
    COREi64 Component Design and Electronics for Retro Computing Platforms
    - Supported Platforms: Atari, Amiga, Commodore,Texas Instruments, Apple and Cross-Platform Boards

  9. #19
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    Quote Originally Posted by COREi64 View Post
    Declaring interest for a couple of these, shipping to Alberta, Canada.

    Thanks
    Thomas
    PM sent!

  10. #20
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    Payment sent!
    COREi64 Component Design and Electronics for Retro Computing Platforms
    - Supported Platforms: Atari, Amiga, Commodore,Texas Instruments, Apple and Cross-Platform Boards

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