Yeah, I have had that before, seems when the data and address bus are bridged you get a goofy error. William Stillwell On Fri, Jan 10, 2025 at 7:24 PM John Robertson via Techtoolslist < techtoolslist@flippers.com> wrote:
Hi folks!
This is a new error message on me, and I am having a problem figuring out exactly what it means. No reference to it is the 9010A nor the 6800 pod manuals under Bus Test - or any other test. Perhaps this was an added treat for version 3A?
Note that the R/W line is not tied low or high, all address lines seem fine. Pod reads 0000 just fine, but if I try to Write AAh to 0000 I get this error msg too, but not if I write 55h. Curious I then try writing 01h, 02h, 04h (all good), 08h - nasty error message! Then again with 10h, 20h, 40h, and 80h - all good. The problem turned out to be a tiny solder bridge between D3 and A2! Pity the Fluke couldn't say anything about that then this cryptic message.
This is the second undocumented error message I've found - we need to list them somewhere...I'll put them on the Fluke page on flippers, and folks are welcome to publish elsewhere although I do like a wee note that it was found on TTL.
Thanks!
John :-#)#
-- John's Jukes Ltd. 7 - 3979 Marine Way, Burnaby, BC, Canada V5J 5E3 Call (604)872-5757 (Pinballs, Jukes, Video Games) flippers.com "Old pinballers never die, they just flip out"
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