Re: Trouble with my Lisa 2/10

Switching the boards appears to have done the trick!

On Thursday, June 14, 2018 at 6:43:28 PM UTC-4, James MacPhail wrote:
>
>
> Hi Kevin,
>
> Two beeps indicates "no memory", which is to say that the self test
> didn't find some reliable memory to use for the stack and/or display.
>
> If you have no memory boards, you need one (or two).
>
> If you have one memory board, try moving it to the other slot.
>
> If you have two memory boards, swap them, and if the problem
> persists, try each one separately in each slot.
>
> The fact that you hear two beeps indicates some things are working,
> eg. you don't get any beeps if the CPU isn't running, or the ROMs are
> bad/wrong, or the I/O board is missing, or the PSU is dead, etc.
>
> The fact that you see something on the screen indicates the video
> board, CRT and flyback transformer are more or less working
> (probably). As Jason wrote, adjusting the brightness control (on the
> back of the power supply) may reveal something that wasn't evident
> before.
>
> If the zig-zag pattern is a sort of checkerboard, then the memory is
> more or less working, if it is a single line at various angles, then
> the memory isn't responding to video access requests or the data
> isn't getting through to the video shift register etc.
>
> When I have this problem with a Lisa that should work, it is almost
> always due to a poor/dirty edge contact.
>
> Lisa problems due to capacitors tend to be power supply related.
>
> Good luck!
>
> James
>
> >I recently acquired a Lisa 2/10. When I try and boot it up, I get
> >two beeps. Then this sort of zig-zag pattern shows up. Is this a
> >problem with capacitors?
>

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