From: William Levak (wlevak_at_sdf.lonestar.org)
Date: 2006-06-22 07:02:07
On Wed, 21 Jun 2006 r.lagendijk@hccnet.nl wrote:
> Date: Wed, 21 Jun 2006 21:02:07 +0200 (CEST)
> From: r.lagendijk@hccnet.nl
> Reply-To: cbm-hackers@ling.gu.se
> To: cbm-hackers@ling.gu.se
> Subject: RAM 4864 and 4164 and Z80
>
> Hello,
>
> I recently bought a P500, the seller said that i didn't know if was
> working. That mostly means it doesn't work. So I opened up the P500 to
> take a look inside. There was a very nice yellow sticker on the
> motherboard with the following text: DEFEKT
>
> The first thing I noticed was that all the RAM has been removed from the
> motherboard (Desoldered)
>
> I found on the schematics that this are dynamic RAM's 4864. My question is
> now can I replace them with 4164's from a 64 (the pinout seems to be the
> same.)
The schematic lists the RAM as 4864-2, which is equivalent to 4164-15,
2164-15, 4564-15, 6665-15, or 3764-15.
> Also the Z80 socket is empty. Can I drop in a z80 or is this not neccesary
> for the working of the P500.
It should not need it to run BASIC.
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