RE: Asteroids - VSM woes

This is the other half of my project to connect the Fluke CPU pods to a PC
parallel port. I finally got the logic analyzer I was looking for (an Arium
ML4100) and I should be able to double check the control lines now...

The Fluke pods (6502, Z80, 68000, 6800, 6802/8, etc...) all use an 8-bit
data for the read/write commands to the pod, there are two handshaking
lines, plus a couple of status lines...only 12 lines in total and only 8
are bi-directional, should be fairly easy with the parallel port...now to
figure out the status lines and the pod self test commands and we might be
able to have a much more useful tool...

John :-#)#

At 10:49 PM 02/05/2002 +0100, Phillip Eaton wrote:

>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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> >
>
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Received on Thu May 2 22:46:26 2002