Help with some code please ...

To: CALC-TI@LISTS.PPP.TI.COM
Subject: Help with some code please ...
From: Jon Baker <jon@MARZIPAN.DEMON.CO.UK>
Date: Sun, 15 Mar 1998 03:22:04 -0000
Reply-To: Jon Baker <jon@MARZIPAN.DEMON.CO.UK>
Xref: paladin.american.edu bit.listserv.calc-ti:21616

Hi all.

I've been programming assembly on computers for nearly 10 years and it's not
until now that I've ever experienced a chip so obscure as the Z80.  Im used
the 68xx(x) series where you can actually do normal operations on all of the
registers.

Anyway.  Im a hardware person on the TI-85 and I use C for programs.

I have a pointer to block of memory (say P)
and a variable initialised to 255 (say A)

I want to do this (in pseudo code)

P=start of block
A=255

loop

A=A XOR [P]
[P]=A
P=P+1
IF P <= end of block goto loop

I've tried writing this but I cant compare a 16 bit number with the address
of the end of the block.

Help please. !  It will look good in the end

Thanks

Asurah
Jon@marzipan.demon.co.uk

Follow-Ups:

Re: Help with some code please ...

From: Jon Baker <jon@MARZIPAN.DEMON.CO.UK>