Re: 250466 PCB curiousness

From: Pasi Lassila <*pasi.lassila_at_gmail.com*> Date: Mon, 8 Jul 2019 00:01:16 +0300 Message-ID: <CACM8tfBA4+Wb1D7oxDOFM4ta2cJ1F=UDxOta5EAh2A7kt7J+fQ_at_mail.gmail.com> · pasi.lassila_at_gmail.com

On Sun, Jul 7, 2019, 11:55 PM <silverdr_at_wfmh.org.pl> wrote:

>
>
> > On 2019-07-07, at 21:43, Jim Brain <brain_at_jbrain.com> wrote:
> >
> > Memory in a 250466 PCB went flaky, so I tried my hand at repair.  The
> PCB is the 3 ROM version, but with 4164 DRAMs.  After desoldering the
> DRAMs, socketing, and installing some new DRAMs (all working now), I
> decided to see if I could switch the unit over to SRAM.  It appears I and
> some other folks had similar ideas,
>
> I recall Gerrit to be among those who successfully did it before (several)
> others…
>
> --
> SD! - https://e4aws.silverdr.com/


Here is the 466 schematic
http://www.zimmers.net/anonftp/pub/cbm/schematics/computers/c64/252278-1.gif
http://www.zimmers.net/anonftp/pub/cbm/schematics/computers/c64/252278-2.gif

-Pasi