Resolved 400k internal drive problems: F0064 error code

Discussion in 'Apple Collectors' started by CrazyWolf, Jul 21, 2015.

  1. CrazyWolf macrumors newbie

    Jul 21, 2015
    I've done some looking into this, and I was just wondering if this means there is a problem with the logic board, or if there is still some way to get this drive up and running before I have to start looking for a replacement.

    I am refurbishing a 512k and would like to keep the original drive with it if at all possible.

  2. MacTech68 macrumors 68020


    Mar 16, 2008
    Australia, Perth
    As you're probably aware, the error code is "Couldn't Read System File into Memory"

    There are two possibilities here.

    Either, the system version on the floppy is too new for the machine (ROMs on the motherboard may be the old 64K originals), OR the floppy drive has a fault of some kind, OR the floppy disk/data therein is damaged/corrupted.

    Depending on whether you have an 800K floppy or 400K floppy drive should dictate which ROMs you should have, and then what format the disk should be.

    Check what version of ROMs you have on the motherboard. The two chips will have a 342-xxxx number on them.

    "ROM-LO" is "342-0221-B"
    "ROM-HI" is "342-0220-B"

    Note that the "-B" ROMs must be used with the Sony OA-D34V-22 or OA-D34V-02 drive. Earlier "-A" ROMs are only compatible with the "OA-D34V" drive. This was due to a stepper motor upgrade on the newer drives that the old ROMs couldn't handle. You can use the updated ROMs (-B version) with both the older or newer drives - it's aware of both.

    ----Post-script - I think that needs a little editing but the text is correct.

    ROMs WITHOUT a "-A" or "-B" are the earliest revision of these ROMs and support only OA-D34V 400K drives.

    IIRC, 800K drives require 342-0341-X & 342-0342-X ROMs. The "-X" revisions must not be mixed. The last pairing is:

    "ROM-LO" is "342-0342-B"
    "ROM-HI" is "342-0341-C"

    Earlier combinations that work are:

    "ROM-LO" is "342-0342-A" AND,
    "ROM-HI" is "342-0341-A" OR "342-0341-B"

    What model of floppy drive do you have? (A pic of the drive with it's model number will easily identify which drive you actually have).

    Also note that 800K drives model MFD-51W-03 with the red on silver model label must use a floppy cable with a yellow Pin 1 stripe (or a red stripe with a wire in the ribbon cable partially cut out. The other models ("MFD-51W" and "51W-10") with black on silver model labels use the red stripe cable with all wires intact.

    Confused much? Once you get your head around it, it's fairly easy - sort of. o_O ;)
  3. CrazyWolf thread starter macrumors newbie

    Jul 21, 2015
    Thanks for the reply MacTech68, I probably should have explained it better, didn't realize how ambiguous I was being. Here's a little more detail on the problem.

    - The drive is a 400k, and the disk works properly in my 400k external on the same comp, so it's not the disk or the system files.

    - The drive USED to work about 3 years ago, although it had problems ejecting at the time. When the diskette is inserted and drive attempts to read it, kinda makes irregular sounding noises, nothing too obnoxious, not the "click of death" either.

    - I had found some resources online suggesting that perhaps I need to adjust the read/write head adjustment screws, or that possibly the logic board needs to be replaced.

    Here is that link:

    Sounds kinda like my problem, however, the article does not mention the error code that I am getting.

    Also acquired yesterday a Macintosh SE in fairly good shape with a 20MB HD internal that doesn't boot and light just blinks. I will create a post for that when the time comes, I reckon LOL

    I was just wondering if anybody else had encountered this particular problem, and if you all had any suggestions what I might do to complete this restoration.

    I will try to get some photos of the drive up after noon today, and a video of it attempting to read the diskette to shed a little more light on the issue. I know that the 400k drives are increasingly rare and would like to keep this one going.

    Thanks for the help, I am a total HACK at this Macintosh stuff, it's all new to me and I am driving with my eyes closed.
  4. CrazyWolf thread starter macrumors newbie

    Jul 21, 2015
    So the side of the drive says OA-D34V-22

    ROMS on Motherboard:
    Hi = 342-0220-B
    Lo = 342-0221-B

    Attached Files:

  5. CrazyWolf, Jul 22, 2015
    Last edited: Jul 22, 2015

    CrazyWolf thread starter macrumors newbie

    Jul 21, 2015

    Link to a video of the machine attempting to boot from a known working diskette.

    Same deal but with case off. Now that I think about it, I'm wondering if the diskette is even spinning... doesn't look like it.
  6. MacTech68 macrumors 68020


    Mar 16, 2008
    Australia, Perth
    OK, the ROM and drive numbers look fine.

    I'm going to say that you should try another boot disk and check the head is clean.

    I don't recommend adjusting the the radial alignment, as suggested by the article you linked to, unless we exhaust every other avenue first.

    If you lift the head pressure pad up about 15 degrees - no more or you will stretch the spring - and check the head. It should be a nice shiny white color with just a thin black line across the middle. If you see a blob or irregular shape, you'll need to clean that first.

    You really should remove, clean and lubricate the eject mechanism. I'm concerned that trying to insert disks whilst the eject cage is in the lowered position could damage the head and/or the floppy disk media. In the mean time, use the large flange at the front right and push it back which is the manual eject. You may need to hold at that position for the mechanism to return to a fully ejected position.

    The other thing you could try is to check that the stepper motor isn't jammed. Using your smallest finger, rotate the worm drive shaft annotated in the pic below. Looking at the photo, rotate the bottom towards you, and the head should move to the right. When you apply power to the drive, it should move the head back to the left.
    drivephoto2 crop annot.jpg
  7. CrazyWolf thread starter macrumors newbie

    Jul 21, 2015
    Thanks a bunch man! You are a true hero for helping me out, I really don't know anything about these Macs. I will give this a shot later today. I did check the read head very carefully and it looks pretty good, I wouldn't say it's white but it's off white and looks nice and clean.

    Also noticed you are in Australia. Went there in 2008 when I was on leave from Afghanistan to visit my buddy who moved to Melbourne. He is now in the Australian army and calls me "mate". You guys have a beautiful country, I had the time of my life, ate some kangaroo, went surfing, partied with your lovely womenfolk and all that good stuff. But speaking with the locals made me question whether or not I truly understood the english language! LOLZ

  8. MacTech68 macrumors 68020


    Mar 16, 2008
    Australia, Perth
    Don't worry. There are differences in some words and phrases from East to West coast here! None that I can mention without risking being reported! ;)

    Oh, you might like this for a little help cleaning the eject mechanism:
  9. CrazyWolf thread starter macrumors newbie

    Jul 21, 2015
    Well, bad news.

    Stepper motor is not jammed as it moved the head to the rear of the drive when I fired it up. Still got the same exact problem. Was unable to get the disk carriage to eject other than manually.

    Adjusted the head height, still same problem.

    So now I suppose the logic board is the problem. Is there anything else I can try?
  10. CrazyWolf thread starter macrumors newbie

    Jul 21, 2015
    Ok I do have an internal 800k that is verified working as I've used it in another machine, a Macintosh SE. I'm sure that my 512k is NOT upgraded ROM but I am currently looking into this... I'm thinking maybe I can swap the ROM from the SE into the 512K and maybe that will work.

    I will post my findings as I know the 400k drives are increasingly rare and this makes refurbishment a difficult task when there are so many 800k's still out there.
  11. CrazyWolf thread starter macrumors newbie

    Jul 21, 2015
    So I attempted to slap in the 800K drive it does not work in the 512K. The model is M0001W type for any who are attempting this repair for themselves.

    Now I will be looking into possible ROM upgrades to get this online.
  12. maczo macrumors newbie


    Dec 25, 2014
    I dont't think that your 512K ROM is broken. Have you tried installing the external 400K drive inside the Mac?
  13. Bloxin macrumors newbie

    Nov 2, 2017
    --- Post Merged, Nov 2, 2017 ---
    Hi, Can you help me ? I just got a Macintosh 128K and when i insert the system disk i get a sad mac with error code 0F0064. Do you think the sony disk drive is not compatible with the roms ?

    Here is my mac hardware info:

    ROM HI: 342-0220-A
    ROM LOW: 342-0221-A
    SONY Disk Drive: OA-D34V-22 (July 1984)
  14. MacTech68, Nov 2, 2017
    Last edited: Nov 2, 2017

    MacTech68 macrumors 68020


    Mar 16, 2008
    Australia, Perth
    All I can say at this point is that Apple's old service documentation strictly notes that a -22 drive must use the "-B" ROMs. NOTE that I've never found out what the symptoms of using an "UN-recommended" combination of ROMs and 400K drive models actually is.

    However, there are other things that can and should be checked.

    Checking the +5 volt rail is a start. Adjust to within + or - 0.5 volts. Also check the +12volt rail.

    Also, the floppy disk you are using should be in the old/original 400k MFS format for those ROMs.
  15. Bloxin macrumors newbie

    Nov 2, 2017

    How do i check the +5 volt rail and all that ?
    --- Post Merged, Nov 3, 2017 ---

    I noticed that when i press the interupt button and the memory test starts it never finishes. It just stays there showing the sad mac face with code 0F000D. What do you think this means ? Can the logic board be damaged ? Or a rom ?
  16. MacTech68 macrumors 68020


    Mar 16, 2008
    Australia, Perth
    You can check the voltages from the floppy port. See Section 5.1 (bottom of page 8) here:

    That particular guide is a wealth of information, well worth a read.

    The behavior you observe with the interrupt button is normal and no cause for concern.

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15 July 21, 2015