Video: https://www.youtube.com/watch?v=klQPO-uYMEA

Forum: https://www.eevblog.com/forum/repair/fluke-199c-scopemeter-repair/

Connector: https://www.digikey.com/short/55dftjnn

• ZIP file contains gerbers and such. This file was submitted to JLCPCB.
• A fixed baud rate of 115200 was used, which should work everywhere. Other speeds were not tested.
• 12MHz crystal was used, which should result in about 7.5% baud rate error, wich was not a problem.
• Forgot to mark LEDs and polarized caps on silkscreen (used non-polarized ceramic caps in practice).
• MCU is marked 3290PA on the schematic, but 3290A can be used just fine.
• Be careful aligning memory modules (card edge type) in this connector since the slot in the connector is slightly longer.
• Be careful about the correct orientation of memory modules in the connector (see video if not sure).

Chip IDs:

$ python programmer.py -i
manufacturer's IDs (U3 U4): 00bf 00bf
device IDs (U3 U4): 2781 2781

RAM test:

$ python programmer.py -t
error count: 0

Read flash:

$ python programmer.py -r firmware.bin

Write flash:

$ python programmer.py -w firmware.bin