Back to the uphacking part. I located several resistors and decided to attach some switches after a few futile attempts to change the resistors using SMT tweezers.
The scope software can be stopped using ctrl-alt-del which opens up the task manager on Win98 and restarted from the menu so testing all the combinations could be done quickly.
R3 R2 R1 R0
- - X X 54835A
X X - - 54845A
X = placed, - = open
I have not found the 54846A mode but I have not included R4 in my test because I didn't spot it when looking for potential candidates. For now I'm fine with the 54845A mode.
According to the notes I have (and I think I PM'd them to you), there are only two resistors used for strapping. Was I incorrect?
(note that my crappy drawing doesn't show that R1 is also 0 Ohms.)
I have a 54846A on my bench that I'm repairing at the moment (bulging caps on the motherboard). When I get it up and running, I'll pull the ACQ board and verify the config.
When I had the motherboard pulled, I noticed that the date code on the sheet metal under the MB was dated 2001, yet the serial prefix is MY40. How can this be?
I would have thought that the sheet metal should have been older, or the serial # newer...