From: William Levak (wlevak_at_cyberspace.org)
Date: 2002-08-24 05:57:49
Check that there is not a jumper on the user port. Pin 5 is the diag
jumper which puts you in the ML monitor. The 6520 that this line goes to
may also be defective.
Check also the first 1K of memory. The screen editor parameters are
stored there.
On Fri, 23 Aug 2002, Bo Zimmerman wrote:
>
> Hi all.
>
> This is an easy one I'm sure. I started working on my sick PET 2016. Turns
> out the picture tube was dead, and needed replacing. That was pretty sad,
> since I had to put a green screen in to replace the previous white screen.
>
> Anyways, now that I have a display, I notice it always powers up with a
> "READY" prompt in the upper-left hand corner. The cursor is located over
> the "R" in READY, and is blinking. Hitting return gives the ML monitor.
> Although all output is restricted to the second-line from the top of the
> screen, I did manage to do a "M 2000 3000" command. Memory there comes back
> as FF 00 FF 00 FF 00 FF .. etc. So that looks OK. There are two banks of
> memory. The row closest to the back of the machine is occupied. The one
> closest to the front is not.
>
> I managed to swap out all the ROM chips (they are 901465-01,02,03 as well as
> the kernal 901447-24). The same bevaior occurs, so I'm thinking its not the
> ROMs. What else could it be? Is it the memory chips (all are socketed)?
> If so, which ones should I look at? What are the proper values for memory?
>
> BTW, this is a neat machine. It has the full-metal casing, like the
> original 2001-8s.
>
> - Bo
>
>
>
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>
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