At 17:43 10/08/2004 -0700, you wrote:
>Hi Dave
> A common failure item in these old machines is the RAM.
>Any failure of the RAM makes things like subroutines fail
>quickly.
>Dwight
Yeah - that did occur to me - hard to diagnose for certain - all the RAM's are
soldered in.
I did remove and socket the ROM's today - so with an EPROM emulator I can put
boot code in fairly easily - anyone know what the minimum I need to do to setup
the video and any other essential hardware is? Also a memory MAP would be
handy (I think I saw one in the Archive - I'll look, however if anyone knows
where the RAM limits are and where Video memory is - could save me sime time.
If I can figure out where the RAM is, and how to write to the screen, I can
boot a small RAM test in the Kernal ROM space.
Regards,
Dave
--
dave04a (at) Dave Dunfield
dunfield (dot) Firmware development services & tools: www.dunfield.com
com Vintage computing equipment collector.
http://www.parse.com/~ddunfield/museum/index.html
Received on Tue Aug 10 2004 - 20:45:44 BST