From: William Levak (wlevak_at_cyberspace.org)
Date: 2002-09-03 07:38:26
On Mon, 2 Sep 2002, Bo Zimmerman wrote:
> Second, I confirmed the locations of the chips, sort of. My board does not
> have the ROM sockets numbered (UD9, UD8, etc), so it was tough to confirm
> against the docs on FUNET. However, if you are facing the front of the
> computer, they are (left->right), 901465-03, 901447-24, 901465-02,
> 901465-01. If that corresponds with UD9-UD6, then they are OK.
Those are correct.
> And last, as Mr. Anderson suggested, I wrote down the monitor entry info.
> It is:
> 007C E62E F1 Fc FF 01 F8
The calling location $E62E is the hardware clock interrupt.
What did you do about screen memory? On the non-CRTC PET's the CPU waits
every 1/30 second for 1/60 second so the screen circuitry can generate
the screen image. The address bus is being used at this time. This is
controlled by the clock interrupt mentioned above.
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