Re: 6510 and 8500 differences

From: Richard Atkinson (
Date: 2000-07-29 01:36:14

On Sat, 29 Jul 2000, Richard Atkinson wrote:

> Here's a short program to do it. You can run it from BASIC and read the
> results stored in result, lsb and msb. In a few minutes I will try it out
> (for the first time) on a plastic C128D, then maybe a breadbox C64. The
> use of bit 7 to do the testing should mean that it applies to the 8502 as
> well.

I've got it going in C64 mode using the C128 monitor to enter the
instructions. The MSB is fairly consistently 37, occassionally 36. The LSB
is all sorts of different numbers. However, this is with the screen
enabled, so I suspect much of the variation is due to VIC DMA. Time to try
it on lots of other machines. I'd be grateful to hear anyone else's
results. I'll post the BASIC handler and m/c binary in .prg formats when I
get X1541 working again. (could be a while so feel free to type in the
program yourself!)


Richard Atkinson
Software Engineer
Tenison Technology EDA Ltd

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