Re: Lisa 2 Repair

Dear Patrick,

Just one thing... Regarding your Lisa keyboard tester... You said that nobody would be interested in using a keyboard adapter for a Lisa. I'm disagree with you...

Using you IDEfile I installed the Apple Pascal and I attempted to program a small game for the Lisa (just for using it), but the original keyboard, even after replacing the pads is really uncomfortable. I would appreciate a keyboard adapter to use for example a PS/2 keyboard.

I was looking the schemes of your tester, but some code is behind managing its CPU... This code is not public...

Are you interested in going further to develope this adapter? Can I have your full schematics to use it as a foundation to link your design with a PS/2 translator?

With best regards,

Raúl

El 19/12/2013 23:56, PSchaefer escribido:
>
> 1. When I turn on the machine, the light under the screen turns on
> and the screen is dark for a while, and after a while a grey
> screen with a pattern of diagonal lines shows up on the screen;
>
>
> Replace capacitor C8 on the CPU board (2,2µF next to the 68000). It
> gets leaky, then the 555 is not able to finish its /Reset pulse.
>
> 2. I don't have a keyboard for this Lisa, but I've read that it
> used a TRS style connector. Is there, to anyone's knowledge, a
> converter for keyboard signals, either from:
>
>
> This has to be invented first. A direct connection is not possible,
> you will need a protocol converter that would accept USB, PS/2 or ADB
> and generate Lisa Kbd signals.
>
> 3. This computer didn't come with a floppy drive inside. Can I
> install a 400k drive from a Mac 128k or a 128k external drive?
>
>
> Yes, it is the same drive.
>
> I also noticed that there are 2 floppy drive ribbon cables inside
> the floppy drive cavity - is this normal?
>
>
> Yes, that's normal. A Lisa 1 has two 26pin cables for its two Twiggy
> drives. A 2/5 uses one of them to connect a Sony 400k drive (via a PWM
> generator board for the variable motor speed). A 2/10 also has two
> cables, but there one is for the floppy (20pin), the other is for the
> hard disk (26pin).
>
>
> Regards
> Patrick
>
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