LisaList2

Another for the spreadsheet.

Model: A6S0300
Memory Option: A6S0304
Serial number: A3356182
Applenet number: 00102186
Manufactured: 3356

Here is a photo of the 230 V configuration: https://upload.wikimedia.org/wikipedia/commons/1/11/Apple_Lisa_Teardown_%2816065582186%29.jpg

Both windings of the standby transformer must be in series, not parallel,  and the input of the main regulator must be configured as a bridge rectifier and not as a voltage doubler. So yes, the lower jumper is the culprit.

Could anyone please confirm for me the jumper settings for 230V for a DataPower 15A0202-000,001 power supply? I bought the Lisa in this configuration in the UK, but it had suffered a blown fuse, a vaporised trace underneath the PSU board and cracked RIFAs.

Attached is a top-down view of the power supply board with callouts for the jumpers, set in the state in which it arrived. (Please ignore that I have pulled the RIFAs and one of the tank capacitors, which was bulging on the top). Of the two jumpers at the top, only one is bridging the 230V terminals; the other jumper in this area is not connected at one end. The jumper at the bottom is bridging the "115V" terminals (YIKEES!). I cannot see any reason for this jumper to be connected for a 230V input supply. The vaporised trace and blown RIFAs are in this area of the board.

As soon as my replacement RIFAs arrive, I'll test the board with the lower 115V jumper disconnected and see what happens (although, if this is the culprit it's likely affected other components on the board). I'm just asking for confirmation of my hunch that this jumper is the culprit..

Best regards, Kevin (Insanely Digital)

Heads up: The new documentary by David Greelish is now available for rent or purchase on Vimeo.

https://vimeo.com/ondemand/beforemacintosh?autoplay=1

Quote from: ried on January 24, 2024, 07:29:56 pm

Another one to add to the sheet...

Is this a 2/5? Is the memory config on a red sticker?

Lisa 1

Another one to add to the sheet...

Is this a 2/5? Is the memory config on a red sticker?

Another one to add to the sheet:

Model A6SB100 - Memory A6SB108.

B08B831970575
00103924
83197

I suppose I have some high school essays from around the same time on my Lisas too, but of course I was doing that for fun after having installed LOS myself atop the previous owner's MacWorks setup

It's also interesting that the Professor was using the Office System in 1988. I wonder how many people were still doing that.

Believe it or not, I have a ProFile with some LisaWrite documents that are dated all the way into 1998 and 1999! Of course, the modification dates won't go this high, but there are some dates mentioned within files that are from this timeframe. From what I recall, the files were the homework of an elementary or middle schooler, so the computer wasn't being used for "real" work anymore, but it was definitely still being used!

Thanks ried, that is most of a relief. I'm obliged to ask (sorry!): is there a chance that you have an exact copy on something that is not a ProFile? The files on an emulated disk is a good start, but if you create and use a new ProFile image on the emulator, then you should be able to make an exact copy to that simulated hard drive just like you did with the ProFile.

I've tried to find some of Professor Gay's papers online, and there are two that come up from the 2000s having to do with indexing systems for text. It's possible that some of his earlier work is not known to search engines and paper databases --- computer science can have a short memory sometimes.

It's also interesting that the Professor was using the Office System in 1988. I wonder how many people were still doing that.