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1984-11-24
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Date: Friday, 16 November 1984
From: Hugh Redelmeier
To: net.micro.cpm
Re: Need Kaypro technical help
I have done serial I/O on the Kaypro II (pre-1984 version) using
interrupts.
- Only the first 16K of address space is bank switched.
- Remember to put your interrupt routine and the vector above 16k.
- You must use the interrupt mode that allows you to
specify that the interrupt vector is above 16k.
- If you are using PluPerfect CPM2.2E, it is already using
interrupts with the SIO (using the SIO channel to the keyboard
as a timer to turn off the disk after a few seconds of inactivity!).
It would be tricky to share the SIO interrupts with CP/M 2.2E.
- Be careful to use very little stack in your interrupt routine:
the interrupted routine may not have left you much. Best to
switch to a private stack immediately on entry to your
interrupt routine.
Date: Saturday, 24 November 1984
From: Mike Rubenstein
To: net.micro.cpm
Re: Need Kaypro technical help
On the Kaypro 10 the first 32K is bank switched.
--
Mike Rubenstein, OACB, UT Medical Branch, Galveston TX 77550