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| Wits end trying to “fix” external floppy drive port on 128k…help needed |
Posted by: MacNinja on 2021-07-19 19:53:49
I recently got a 128k that could not boot at all. I was able to get the internal floppy to boot just fine now by fixing the actual drive but I cannot for the life of me fix the external DB19 port to read floppies via floppyemu.
- I am using a known working floppy emu.
-using a known working analog board from another system that boots fine using floppyemu
- when booting from floppyemu the system just hangs at the ?floppy icon on screen.
-when booting from internal floppy, and error keeps popping up that the drive needs initialized. This only happens when the floppyemu is connected. When it is not, and I boot from internal floppy I get no errors.
- I reflowed the WOZ disk controller chip.
- I completely replaced the DB19 port on the logic board.
-the 3 capacitors have been replaced.
What else can be done? Any and all advice is appreciated. I’d really like to get this working so I do not have to rely on the aging internal floppy drive.
this is also my first post of a long time lurker. Please be easy on me. I’m new to this type of work.
Thank you! |
Posted by: Cinan on 2021-07-19 22:15:47
What OS version are you selecting on the FloppyEmu ? I assume the FloppyEmu is getting power through the DB19. |
Posted by: mg.man on 2021-07-20 00:51:22
First thing I would try is connecting the FloppyEMU to the internal floppy port directly - just use its ribbon, removing the DB19 adapter. |
Posted by: MacNinja on 2021-07-20 17:00:01
What OS version are you selecting on the FloppyEmu ? I assume the FloppyEmu is getting power through the DB19. Thank you for replying. I always use 3.2 on these older macs. I also tried 1.1 and it did not work either. Both work on my other 128k.
First thing I would try is connecting the FloppyEMU to the internal floppy port directly - just use its ribbon, removing the DB19 adapter. Thank you for the reply. I just tried it and was able to boot successfully into system 3.2. I’ve used the DB19 adapter on my other system just now as well. No issues and booted fine. |
Posted by: marcelv on 2021-07-21 00:26:08
Did you check continuity between internal, external connector and floppy controller?
The only pin different between internal and external connector is the enable (ENBL1 / ENBL2) |
Posted by: MacNinja on 2021-07-21 19:28:41
Did you check continuity between internal, external connector and floppy controller?
The only pin different between internal and external connector is the enable (ENBL1 / ENBL2) Thank you for the reply. I’m sorry, but I’m very new to using a multimeter. Am I to pair each up to see if there is continuity? I also don’t know which pins I should pair for the floppy controller. I’m very sorry to pester for more assistance!
edit : nevermind. Your post helped me out so much. I did some youtube quick lessons and it was the ph2 that was not registering. I soldiered a wire to connect the two, tried the floppyemu again and it worked. Wow — I cannot thank you enough!!! |
Posted by: cheesestraws on 2021-07-23 01:30:41
Success! Well done 🙂 |
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