A thought for diagnostics

All information relating to the Alpha plus all the WIP threads etc.
Post Reply
User avatar
exxos
Site Admin
Site Admin
Posts: 23499
Joined: Wed Aug 16, 2017 11:19 pm
Location: UK
Contact:

A thought for diagnostics

Post by exxos »

I wonder if a new simple ROM could be done, a small loop which would basically pulse each address line one by one...

.. Would probably have to wire DTACK low else it probably cause a BERR as not every address is used etc...

Also probably have to hardwire ROM chip enable to gnd as we dont know if GLUE decoding is even working right yet..

Though at least it would help diagnose things, as a small loop in ROM can just be 68000 code only, and address lines pulsing can be seen on the scope.. at least then we know the CPU is running as it should..

Probably just a bunch of reads from each address range into the CPU internal registers.. nothing more..
https://www.exxosforum.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
troed
Moderator
Moderator
Posts: 908
Joined: Mon Aug 21, 2017 10:27 pm

Re: A thought for diagnostics

Post by troed »

Well we've seen bombs. That means, I believe, CPU is working, GLUE is working, MMU is working, Shifter is working.
User avatar
exxos
Site Admin
Site Admin
Posts: 23499
Joined: Wed Aug 16, 2017 11:19 pm
Location: UK
Contact:

Re: A thought for diagnostics

Post by exxos »

Only on one machine.. The other isn't doing anything, and I would imagine there are about 15 other boards out there to diagnose yet as well.
https://www.exxosforum.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
Post Reply

Return to “ALPHA DEVELOPMENT INFO”