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are 4164's the same as mt4067-12

reanimatorreanimator
edited October 2013 in Hardware
just wondering if I can use as direct replacements
as I have a +2a here with ic5 and ic4 overheating, also what are the correct voltages for these ic's?
thanks in advance
Post edited by reanimator on

Comments

  • 1024MAK1024MAK
    edited October 2013
    reanimator wrote: »
    just wondering if I can use as direct replacements
    as I have a +2a here with ic5 and ic4 overheating, also what are the correct voltages for these ic's?
    thanks in advance
    The RAM chips in all 128k Spectrums only need a +5V supply.
    The grey +2 uses KM4164B-15P (or equivalent) 64k X 1 bit DRAM chips.
    The black +2A and +2B use TMS4464-12 or M5M4464-15 (or equivalent) 64k X 4 bit DRAM chips.

    From a quick glance at the data sheet, it looks like MT4067-12 DRAM chips may work in place of 4464 DRAM chips.

    If you do fit some and it works, please let us know :smile:

    Mark
    Sinclair FAQ Wiki
    Repair Guides. Spanish Hardware site.
    WoS - can't download? Info here...
    former Meulie Spectrum Archive but no longer available :-(
    Spectranet: the TNFS directory thread

    ! Standby alert !
    “There are four lights!”
    Step up to red alert. Sir, are you absolutely sure? It does mean changing the bulb!
    Looking forward to summer in Somerset later in the year :)
  • reanimatorreanimator
    edited October 2013
    This +2a has MT4067-12's fitted already
    so they must work in a +2a except these seem fried
  • DEATHDEATH
    edited October 2013
    In that case, no. 4164 chips won't even fit in the socket - you need 4464 chips for a +2a/+3 ;)
    Oh bugger!<br>
  • reanimatorreanimator
    edited October 2013
    DEATH wrote: »
    In that case, no. 4164 chips won't even fit in the socket - you need 4464 chips for a +2a/+3 ;)

    lol I meant 4464's as I have eight of them here in front of me :oops:
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