Resolved 400k internal drive problems: F0064 error code

[mxrider88]

Yes, the analog boards from a 128K, 512K, 512Ke and Plus are interchangeable.

The 128K motherboard can easily be put into the MacPlus chassis. You may need to check the +5volt rail adjustment when you swap boards.

Test initially with floppy drive (emulator), mouse and keyboard disconnected to minimize other causes.

I ideally want to keep the 128k original chassis and put the plus analog board in, being extra careful obviously.
the board might need a refurbishment anyway.
The emulator is not mine, it’s the guy who had the Mac who has it but he is 2 hours away from Sydney where I live.

I really hope I can get it back to a good shape and keep it.

do the analog boards have a serial number? I would love to have it like an original not a messed up Mac.

 

[mxrider88]

also, on the 128k when I insert the system disk I get error 0F0004. On the plus the same disk gets ejected, no error.
Any idea of what it could be? They both were booting with the floppy emu. Cheers

 

[MacTech68]

For troubleshooting the mother board, I'd suggest settling on a working chassis which right now seems to be the plus. Once you work out the issues with the boot up & motherboard, then transfer it into 128K chassis. That's just how I'd proceed.

In any case I think you have a system version vs rom version vs drive capacity problem.

If you already have them apart, get some pics of the ROM & SWIM chips.

 

[mxrider88]

For troubleshooting the mother board, I'd suggest settling on a working chassis which right now seems to be the plus. Once you work out the issues with the boot up & motherboard, then transfer it into 128K chassis. That's just how I'd proceed.

In any case I think you have a system version vs rom version vs drive capacity problem.

If you already have them apart, get some pics of the ROM & SWIM chips.

View attachment 939767

They aren’t apart at the moment. I’ll swap the board as soon as I have some time and get back to you. Thank you!!

 

[mxrider88]

Hello again, just taken it all apart and inspected. There is a bit of corrosion here and there but not too bad after all.
I got a floppy emu and it boots but if I try to boot for example the macintosh tour it all goes crazy, see the video attached.
what could that be?
this was taken while the floppy emu was connected directly into the main board and the floppy drive disconnected.

The floppy drive also doesn’t work well but that’s another story I guess.

does it have anything to do with the voltage or could it be a bad joint?

thanks!

 

[MacTech68]

Those are the original ROMs. They are known to exhibit the 0F0004 error when trying to boot from or use an external 800K drive without the HD20 init extension, System file v3.0 or greater and Finder file v5.0 or greater. Note this only affects external drive use. It causes a "Divide by Zero" error.

As for the error after it boots in the video, I'm unsure. Yes, it could be the +5v rail adjustment.

I assume the FloppyEMU is set to emulate the correct drive type (seems like it is).

The internal floppy drive will need to be cleaned and re-lubricated, if it hasn't already.

A pic of the whole logic board, internal floppy drive (and it's Part number label) and both analog boards might be advantageous.

 

[mxrider88]

Those are the original ROMs. They are known to exhibit the 0F0004 error when trying to boot from or use an external 800K drive without the HD20 init extension, System file v3.0 or greater and Finder file v5.0 or greater. Note this only affects external drive use. It causes a "Divide by Zero" error.

As for the error after it boots in the video, I'm unsure. Yes, it could be the +5v rail adjustment.

I assume the FloppyEMU is set to emulate the correct drive type (seems like it is).

The internal floppy drive will need to be cleaned and re-lubricated, if it hasn't already.

A pic of the whole logic board, internal floppy drive (and it's Part number label) and both analog boards might be advantageous.

Ok i will worry about the floppy drive in a second moment. Is the drive from the plus the same by the way?
Please see a pic of the whole board attached. I might just have been given the wrong system disk then...
I don’t have a photo of the drive, I will have to take it out again, it is a Sony though. And it is the same number of the drive of the plus but the plus has an extra 03 at the end of the number. If it helps.

Thanks!

 

[MacTech68]

Those floppy drives sound like an 800K (double sided) drive.

Your motherboard looks like an original 128K (never upgraded). Latest chip I can see in the photo is week 16 1984.

 

[mxrider88]

Really? How would I know for sure?
No good.. I want this mac to the original state. is this the reason why it doesn’t read the system disk I’ve got then or are they backwards compatible? any idea if it’s possible to find an original drive unit somewhere or do you have one to sell maybe?
Thanks for your help I really appreciate it!

 

[MacTech68]

Really? How would I know for sure?

If you mean the drive, MP-F51W-03 is a Sony 800K drive.

400K drives can be Models OA-D34V, OA-D34V-02, OA-D34V-22

And no, this drive should work with the later system versions above with the HD20 init - Your ROMs lack the additional driver - but, if you want to stick with the 'original ROMs', these are the issues you will face.

 

[mxrider88]

If you mean the drive, MP-F51W-03 is a Sony 800K drive.

400K drives can be Models OA-D34V, OA-D34V-02, OA-D34V-22

And no, this drive should work with the later system versions above with the HD20 init - Your ROMs lack the additional driver - but, if you want to stick with the 'original ROMs', these are the issues you will face.

well yes I’d like to have it in the original state, so I’ll have to look for a 400k drive..
the drive number is F51W, without 03.
Regarding the crash I get when I run from the floppy emu do you have any clue of what it could be?

thanks!! You are an encyclopaedia my friend ?

 

[djjeff]

well yes I’d like to have it in the original state, so I’ll have to look for a 400k drive..
the drive number is F51W, without 03.
Regarding the crash I get when I run from the floppy emu do you have any clue of what it could be?

thanks!! You are an encyclopaedia my friend ?

Looks like a really nice and clean 128K you have there. Does the system not have the floppy drive installed?

 

[mxrider88]

It had a 800k drive unfortunately.. so it doesn’t boot from floppy :-(

 

[djjeff]

It had a 800k drive unfortunately.. so it doesn’t boot from floppy :-(

Since you're wanting to keep it in its original state I would recommend locating the original 400KB drive. They fairly reliable once the dried lubricant (ironic eh?) has been removed.

 

[mxrider88]

Very hard to find though.. for a reasonable price...

 

[zastin17]

Put your aluminum Sheild Back on. Then try formatting!!

The aluminum sheild is very important, the CRT and powerfull stray EMF or something like that from the Macintosh will cause formatting to fail 99% of the time in my case, with 2x diffrent 400K drives.

Because the cable is so short, many people service these drives directly outside the case near the Macintosh power supply. The Alumnum case is a pain in the butt to install, so most wouldn't put it back on until the drive would work. But it's not going to work without the Aluminum sheild in the first place!

The very second I put the Aluminum case/sheild back onto the drives. Both immediately 100% successfully formatting!! I can't believe it! All this time, and for me atleast, it was just that I didn't have the case installed!.