Re: TI-85 link port in asm
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Re: TI-85 link port in asm
I only have answers to questions 3 and 4: Execution time is not affected by
the amount of free memory, but it may vary slightly depending on battery life.
Useful reference manuals for the Z80 can be ordered for free from Zilog. They
give plenty of information on the way the chip works, as well as every
instruction. Although they have an order form at their web site, it usually
doesn't work, so just fax them the order.
________________
Jeff Tyrrill
http://tyrrill-ticalc.home.ml.org/
http://ti-files.home.ml.org/
-----Original Message-----
From: Open discussion of TI Graphing Calculators On Behalf Of Jani Nikula
Sent: Thursday, July 31, 1997 12:34 PM
To: CALC-TI@LISTS.PPP.TI.COM
Subject: TI-85 link port in asm
Hi -
Here's a few questions concerning programming the TI-85 link port in
assembly (on a non-turboed calculator, using ZShell):
- How fast can you send/receive, bits per second, error free --- in
practice, not theoretically?
- What is the shortest and most accurate time that can be used as a delay,
say, using the instruction execution speeds?
- Is there a list of Z80 instruction execution times available somewhere?
- Does the execution speed of an assembly program depend on the amount of
free memory the way it does in basic and everything else?
- Is it possible to forbid interrupts in a program w/o crashing the calc
and still use the link port?
I'd just like to know this stuff before I get any deeper into a project
aiming at attaching a new device to the calc... these are quite essential.
Any information that you think is relevant is welcome.
Thanks in advance,
Jani