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  1. The floppy emu can be a solution. It is easy to tranfer files with a SDcard. https://www.bigmessowires.com/shop/product/floppy-emu-model-c-bundle/ Some more information for transfering files: https://lowendmac.com/2007/making-floppies-and-cds-for-older-macs-using-modern-macs-windows-and-linux-pcs/ My first approach to using floppies was the software HFVExplorer, that can write 1.44MB floppies on a windows PC. With some more hardware (raspberry pi, localtalk-ethernet-bridge) you can use the A2Server to share drives between the SE/30 and a windows PC
  2. Could be broken solder joints on LB or AB. Check the connections from AB to LB. Resolder the connections. Where did you check the voltages? Floppyport?
  3. Try to reseat the neck board on the crt. Check the solder joints on the neck board.
  4. Classic AB have most often problems with: TDA4605, CNY17G, IRFBC40, DP3 and DP4 (1N4148). Sometimes the two RIFA capacitors (CP19 & CP38) are cracked.
  5. Sad mac error codes: https://udcf.gla.ac.uk/~gwm1h/Error_Codes/Sad_Mac_Codes.html
  6. Is the LB recapped? Perhaps there is a rotten adress line caused by leaking caps.
  7. The RAM External addressing test failed. The Z field indicates a failed address line. Could be a broken adress line. Not sure, but can be two adress lines: 00000001 A0; 00000002 A1; 00000004 A3; 000000008 A4; 00000010 A5 and so on 00000040 could be A8 00400000 could be A23 I do not know, if this is the right interpretation but it could be.
  8. Perhaps you need an adapter like this? https://www.amazon.de/InLine-72919-50-polig-Pfostenstecker-68-polig/dp/B000PH8ZWS
  9. Did you run the software patches for System 7.5? https://www.bigmessowires.com/mac-se30-with-upgraded-rom/
  10. Did you measure the voltages when the AB was connected to the LB and the CRT? Or did you measure the voltages without these connections? If I remember right, my AB showed similiar voltages when it was not connected.
  11. Just an idea: 00000001 A0? ; 00000002 A1?; 00000004 A2? 00000008 A3? 00000010 A4? ; and so on? 00100000 would be A20? 00080000 would be A19? Do not know, if I am right, but could be possible.
  12. ROM download: https://www.macintoshrepository.org/7038-all-macintosh-roms-68k-ppc- Sometimes must be splitted up into 2 Files.
  13. Did you measure the voltages at the floppy port? Must be 5 and 12V. Fluctuating voltages can result in rebooting. The AB should be recapped!
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