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    Mac Plus Sad Mac Error 03FFFF

    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?
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    Trying to fix two Mac plus logic boards

    Did you measure the voltages at the floppy port? Should be 5 and 12 V.
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    TashTwenty: Single-Chip DCD (Hard Disk 20) Interface

    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!
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    TashTwenty: Single-Chip DCD (Hard Disk 20) Interface

    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...
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    TashTwenty: Single-Chip DCD (Hard Disk 20) Interface

    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?
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    Mac Plus Sad Mac Error 03FFFF

    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
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    Entry to Programming

    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...
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    SCSI HD doesn't boot internally in SE/30 (but works externally)

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

    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.
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    Battery bombed SE/30 prospects?

    If you try to repair your board, some components are missing (Y1, RP8).
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    TashTwenty: Single-Chip DCD (Hard Disk 20) Interface

    Would the PIC16F1704 work with your first pcb-design, shown on the first pages of this thread?
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    Preserve an SE (M5011) for the future

    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.
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    Beige filament for 3D printing?

    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...
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    Mac Plus Alps keyboard switch, anything in the UK?

    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
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    How to get software on a Mac Classic?

    https://lowendmac.com/2007/making-floppies-and-cds-for-older-macs-using-modern-macs-windows-and-linux-pcs/ http://www.savagetaylor.com/
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    Upgrading SE with SE/30 Logic Board... Doesn't Fit

    https://www.etsy.com/de/listing/840042244/macintosh-se30-rom-clips https://www.prusaprinters.org/prints/35592-macintosh-se30-rom-clips
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    Mac SE Sad Mac Error Codes?

    If you have a working plus and classic, you can swap the ram into the SE. Perhaps your ram in the SE is defect.
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    Booting a Mac Plus from external SCSI2SD, setup issue

    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...
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    Mac SE Sad Mac Error Codes?

    Could be a ram error in bank b. https://udcf.gla.ac.uk/~gwm1h/Error_Codes/Sad_Mac_Codes.html
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    Weird sad sound from SE/30

    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