RE: Asteroids - VSM woes

One day, when I get round to it, I'm going to port a Forth operating system
onto 6502, Z80 & 6809 and knock up some decent test ROMs for old games.

Then I want to add an RS232 port and a PC keyboard interface, using a small
expansion PCB that would connect under the uProcessor.

Then, I want to........and, and, and...

Should need just a small amount of RAM/ROM at the bottom of address space to
test the RAM/ROM system (although if that bit doesn't work, you're
buggered).

I currently have it running on some proprietry Z80 & 8086 boards, at the
company where I used to work. (Used for communications processing and
control systems work using a multi-tasker.)
http://www.lee-dickens.biz/systems/prod_rtu.htm

This idea came from when I was trying to debug my Defender RAM problems and
failing badly due to it's shitty RAM diagnostics, and of course the fact
that I'm a sucker for Forth...

L8r,
D-Type

> -----Original Message-----
> From: owner-vectorlist@synthcom.com
> [mailto:owner-vectorlist@synthcom.com]On Behalf Of Phil Morris
> Sent: 01 May 2002 19:23
> To: vectorlist@synthcom.com
> Subject: RE: VECTOR: Asteroids - VSM woes
>
>
>
> > These were all due to bad RAMs that had all passed the RAM test.
>
> Well, I've now tried replacing all the RAM chips with tested good ones
> (both program and vector RAM) but it made no difference. Still, I
> at least
> know the RAM is fine now. :-)
>
> Given the relevant programming skills and Asteroids hardware knowledge,
> would it be possible to knock up a special test EPROM for, say, Asteroids
> that not only thoroughly tests the RAM and ROM, but maybe also other
> components on the board?
>
> I should have also said that I know the VSM is causing the
> constant resets
> as I clipped pin 1 of the LS42 at L6 (so isolating the VSM) and the game
> then plays fine (but obviously blind!).
>
>
>
> Phil
>
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Received on Thu May 2 14:56:06 2002