Re: Apple IIc going crazy, bad ROMs ?

["Silicon Sam" <SiliconSam@gmail.com>]

Gabriele72 wrote:
> Hello,
>
> my attempt to revive an Apple IIc ended in a comatose unit... perhaps
> someone here may point me in the right direction to fix it.
>
> The machine powers up with the usual Apple //c [...] Check Disk Drive
> writings but also some "@" appear on the screen here and there. Despite
> what I throw in the disk drive, the machine always ends up in system
> monitor.
>
> Breaking into basic prompt is possible but basic commands return weird
> effects (the commands give the expected result followed by load of
> garbage characters). I suspect one or more bad ROMs but I can't verify.
>
> I noticed 3 socketed ROMs, 342-0133 CHARGEN (I think it's fine),
> 342-0284A MAP, and 342-0272 MON. I can burn 2716 EPROMs and up if
> needed. Any suggestion is greatly appreciated.
>
> *Gabriele*

  Sounds like bad RAM to me....  It's far more common for the RAM to
fail than the ROMs.  There is a built-in RAM test, try resetting it
with CTRL-Open Apple-RESET or CTRL-Closed Apple-RESET.  Or CTRL-both
Apple keys-RESET does it with sound.  It's been far too long, but I
think that's it.

Raymond