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Use 25V position. Put the red cable to pin 8 and the black cable to one of the screw (ground). Then you should measure about 12 V. Do the same with pin 6 for 5 V. If you measure 0 V, your analog board has a problem. Did you check the solder joint of the power connector?

Did you measure the voltages at the floppy port? Should be 5 and 12 V.

Yes, 4.86V at the level shifter board. I downloaded MPLAB 8.92 and now I can build the HEX-File. A Pickit3 is ordered. I had a Pickit2 but it will not work with the 1825. Now I am waiting for the pickit3... Thanks for your help!

Thank you for the link to the HEX-File. I tried to flash the 1825 with a TL866plus, but a mac plus with a 6.08 boot disk does not see the HD20. I used the image with two drives. The SD-Card has 4.86V at VCC. I think that there is a problem with flashing the 1825. Up to now I only worked with...

I have some questions: 1. Where can I download the HEX-files for the firmware for the 1825? I am new to PICs and tried to compile the firmware with MPLAB X IDE but I get an error with the file P16F1825.inc and the build stops. 2. Which IDE and compiler do you use to compile the firmware?

Yes, 03 is bad RAM, but FFFF means that all chips are bad! Usually the subcode is used for the identification of the bad chip: https://udcf.gla.ac.uk/~gwm1h/Error_Codes/Sad_Mac_Codes.html

You could try THINK Pascal 4.5. It is a nice development tool. Pascal is easy to learn and there are a lot of books available. Apple developed a lot of software for macs with Pascal. https://www.macintoshrepository.org/1550-symantec-think-pascal-4-5 If you want something newer than Pascal you...

I think, that Rt are the termination resistors. You need them, when you want to use the drive internal terminated.

Did you measure the voltages at the floppy port? Must be 5 and 12 V. I would recap the analog board too if it was not done so far.

If you try to repair your board, some components are missing (Y1, RP8).

Would the PIC16F1704 work with your first pcb-design, shown on the first pages of this thread?

The unstable screen can be caused by leaking caps on the analog board or the PSU. I would recap them first. The keyboard is easy to find and not so expensive like the Mac plus keyboards.

This https://www.amazon.com/gp/product/B071L3L6MC/ was used here: https://www.instructables.com/Making-a-Tiny-Mac-From-a-Raspberry-Pi-Zero/ Edit: Just saw that you search for platinum. But perhaps someone searches for the older beige macs...

Sometimes the switchplate is broken inside. I repaired some of them with a little bit of aluminium foil to make sure that there is a contact. https://deskthority.net/wiki/File:Alps_internals--CM,_complicated,_grey_switchplate.svg https://deskthority.net/wiki/Alps_SKCL/SKCM_series

https://lowendmac.com/2007/making-floppies-and-cds-for-older-macs-using-modern-macs-windows-and-linux-pcs/ http://www.savagetaylor.com/

https://www.etsy.com/de/listing/840042244/macintosh-se30-rom-clips https://www.prusaprinters.org/prints/35592-macintosh-se30-rom-clips

If you have a working plus and classic, you can swap the ram into the SE. Perhaps your ram in the SE is defect.

My plus can boot of a scsi2sd! I posted in this Thread (Page 3): https://68kmla.org/bb/index.php?threads/fitting-a-scsi2sd-in-a-68k-mac.3742/page-3 I used the description of MOS8_030. The vendor etc. were Seagate and ST225N. Device Size: 8 GB; HD SC Setup formated 20 MB. OS 6.0.8 Then I was...

Could be a ram error in bank b. https://udcf.gla.ac.uk/~gwm1h/Error_Codes/Sad_Mac_Codes.html

It is a death chime. Could be a RAM/ROM Error. Open the case and check/reseat the RAM/ROM. Which ROM do you use? Rominator sometimes does not fit very well in the ROM slot. https://www.prusaprinters.org/de/prints/35592-macintosh-se30-rom-clips