Thread
512K will not boot despite working diskdrive
Hello, I´m trying to restore a 512K but it will not boot.
When I start the 512K it shows a diskette with a questionmark. I use a 400k diskette with system disk 2.0 and when its entered in the diskdrive it will not boot. The question mark disappear but its not booting. The diskette is working and the diskdrive is working with another Mac (128k). I have tried to boot from an external diskdrive (400k) but with the same result.The external drive is working with the 128K. I have checked the cables to the diskdrive and its seems ok.
Is it maybe some problem with the logic board? I appreciate any advice how to proceed.
Thanks.
When I start the 512K it shows a diskette with a questionmark. I use a 400k diskette with system disk 2.0 and when its entered in the diskdrive it will not boot. The question mark disappear but its not booting. The diskette is working and the diskdrive is working with another Mac (128k). I have tried to boot from an external diskdrive (400k) but with the same result.The external drive is working with the 128K. I have checked the cables to the diskdrive and its seems ok.
Is it maybe some problem with the logic board? I appreciate any advice how to proceed.
Thanks.
Need higher system I would wager. Need like system 2 with finder 4.1 is the earliest I found can work, but not always. Might need higher would be my guess. Someone may have swapped a rom or whatever to get it working and it may need a higher system.
Good luck
Good luck
There is no minimum OS for the 512K. It can booth the original system 1.0.
To go even farther, any Mac up to the SE has no real "minimum system" - they'll boot off anything they have RAM for and can read. So that would cover the scenario of Mac Plus ROMs in the 512...
My plus will not boot system 2. Are you sure?
Beige or platinum. But my 128 upgrade does.
Pluses need system three, Finder 5.1 I believe.
I got my Platinum Plus to boot from a Sys 1.1 floppy.
According to web the 512ke motherboard requires system 3 also so like I said I'm betting 2.0 maybe to low of system software. It may say 512k on the unit but who knows what's been done to it before you.
Good luck.
Good luck.
I got my SE SuperDrive to boot off the 400KB System 1.1 floppy I made for what I thought was a Mac 128K, but turned out to be a 512Ke. So, there truly is no minimum System requirement for the early 68000 compact Macs.
Jason, when I'm down there this coming weekend, we can try my floppy in your machine...
-J
Jason, when I'm down there this coming weekend, we can try my floppy in your machine...
-J
Same here - on an SE and SE Superdrive, I was able to boot the entire series of systems that used to be available on the mac512.com site before Apple made them take it all down. "0.1" onward...
is the drive spinning? head seeking? doing anything?
I'm not worried about it as my 128 and 512 boot fine, I was just saying its possible it won't and system requirements listed on the 512 site differ from others. Just like my 128's are finicky. It may have something to do with rot, was just throwing it out there. He may just need to use a disk cleaner (wet/dry) or pull the drive out and clean the heads and re lubricate assemblies and such.
Thank You all for trying to solv this problem.
I think this is a 512k not 512ke. The high ROM is 342-020 and low ROM 342-0221-A. The disk drive is Sony OA-D34V-22 and I think its 400k. I use System disk 2.0 and Finder 4.1. I have re-lubricated the mechanism with help from sadmanonatrains fine pdf guide https://docs.google.com/file/d/0B6j6P7lBWw-BNHQ4dXRYZkFGdzQ/edit?usp=sharing&pli=1 . The head is cleaned. The disk drive and diskette is working perfect with another Mac.
Techknight asked about the diskdrive. When I put in the disk the disk starts spinning constantly but the head is not moving. If I start the Mac first the diskette with questionmark appears on the screen. When I put in the diskette the questionmark disappears and the disk is spinning constantly.
If I put in the diskette first in the diskdrive and then put on the Mac: Happy Mac appear on the display but nothing more happens, no booting.
I have used both internal disk drive and an external with the same result. The connections looks OK, what about the filter HYTEK 8444 RC1150002C ? Can that be the problem?
I think this is a 512k not 512ke. The high ROM is 342-020 and low ROM 342-0221-A. The disk drive is Sony OA-D34V-22 and I think its 400k. I use System disk 2.0 and Finder 4.1. I have re-lubricated the mechanism with help from sadmanonatrains fine pdf guide https://docs.google.com/file/d/0B6j6P7lBWw-BNHQ4dXRYZkFGdzQ/edit?usp=sharing&pli=1 . The head is cleaned. The disk drive and diskette is working perfect with another Mac.
Techknight asked about the diskdrive. When I put in the disk the disk starts spinning constantly but the head is not moving. If I start the Mac first the diskette with questionmark appears on the screen. When I put in the diskette the questionmark disappears and the disk is spinning constantly.
If I put in the diskette first in the diskdrive and then put on the Mac: Happy Mac appear on the display but nothing more happens, no booting.
I have used both internal disk drive and an external with the same result. The connections looks OK, what about the filter HYTEK 8444 RC1150002C ? Can that be the problem?
When I've had bad drives or bad media, it always caused the Mac to crash part-way through booting, with a Sad Mac, or else it would eject the disk media with the "X disk" icon. I've never seen a compact Mac hang and just do nothing after showing the Happy Mac icon. This is total speculation, but I would suspect a logic board problem rather than a problem with your drive or disk.
Just becuase the drive is spinning and the head isnt moving, sounds like it cannot find track 0. if the drive and disk work in another mac, Then the IWM is bad, or more likely, that bourns network is bad.
Happy Mac means at least one sector was read from the disk, so the track 0 indicator and IWM are working at least that much.
I think one of the 512's I received last year did something similar. Would just sit there, :beige: as a clam... Cursor wouldn't move, nor would it boot a disk.
-J
-J
I have noted a difference when I use the internal or external disk.
Internal connection:
If I start the Mac first the diskette with blinking questionmark appears on the screen. When I put in the diskette the questionmark is still there but not blinking. Disk constantly spinning. If I put in the diskette first in the diskdrive and then put on the Mac: Happy Mac appear on the display but nothing more happens, no booting. Disk constantly spinning.
External connection:
If I start the Mac first the diskette with blinking questionmark appears on the screen. When I put in the diskette the questionmark is still there but not blinking. Disk constantly spinning. If I put in the diskette first in the diskdrive and then put on the Mac: questionmark is still there but not blinking. Disk constantly spinning.
I dont know if that difference mean anything. The mousepointer is working. Can it just be bad connection from the diskdrive?
Internal connection:
If I start the Mac first the diskette with blinking questionmark appears on the screen. When I put in the diskette the questionmark is still there but not blinking. Disk constantly spinning. If I put in the diskette first in the diskdrive and then put on the Mac: Happy Mac appear on the display but nothing more happens, no booting. Disk constantly spinning.
External connection:
If I start the Mac first the diskette with blinking questionmark appears on the screen. When I put in the diskette the questionmark is still there but not blinking. Disk constantly spinning. If I put in the diskette first in the diskdrive and then put on the Mac: questionmark is still there but not blinking. Disk constantly spinning.
I dont know if that difference mean anything. The mousepointer is working. Can it just be bad connection from the diskdrive?
I think your network filter has gone bad... it happens quite abit i'm finding.
Maybe I should replace the network filter. HYTEK 8444 RC1150002 is unknown for Google. I have seen in an earlier thread that the SE/30 has a filter as described in
viewtopic.php?f=7&t=18026&hilit=bourns&start=25
I have measured the resistance between pin 2-19, 3-18 etc in my 512k and its 50 ohms so maybe it’s the same as in the SE/30? I can´t measure the capacitance.
Anybody know if I can use the same (for example Bourns 4120R-601-250/201) in the 512k?
Its available on ebay.
viewtopic.php?f=7&t=18026&hilit=bourns&start=25
I have measured the resistance between pin 2-19, 3-18 etc in my 512k and its 50 ohms so maybe it’s the same as in the SE/30? I can´t measure the capacitance.
Anybody know if I can use the same (for example Bourns 4120R-601-250/201) in the 512k?
Its available on ebay.
After some time I have continued work to get this 512k functional. I replaced the HYTEK with the Bourns 4120R-601-250/201 filter.
No change after replacement. The floppy drive is spinning but the same "happy Mac" and no booting. I checked the HYTEK filter with a resistance and capacitance meter and the HYTEK seems OK.
I have tested the logic board in a working 128k but the 512k board is not working. The boot disk (OS 2.1) and floppy drive from 512k is working with the 128k.
Any suggestions how to proced?
It would by very nice to get it working.
Greatful for any advice.
No change after replacement. The floppy drive is spinning but the same "happy Mac" and no booting. I checked the HYTEK filter with a resistance and capacitance meter and the HYTEK seems OK.
I have tested the logic board in a working 128k but the 512k board is not working. The boot disk (OS 2.1) and floppy drive from 512k is working with the 128k.
Any suggestions how to proced?
It would by very nice to get it working.
Greatful for any advice.
Have you tried to re-seat the ROMs? Sometimes that is all it takes.
I tried to reseat the ROMs but no change. I have tried with both system 2.0 and 1.0. The floppy drive is working with another 512k.
The mouse is working with my defect 512K , but when I put in a floppy disk the reader starts spinning and continues to spin. The steppermotor is not moving.
I have checked the voltage(+5,+12,-12 volt) to the drive and its OK.
Is it possible to measure the signals from the logic board to the floppy drive and locate the problem???
Just wondering, have you tried the floppy cable in another mac as well?
You said you confirmed the drive works in another Mac. The fact the stepper motor doesn't work, may hint at one problem. Check the ROMS in the other Mac you tested it in. If they are Mac Plus ROMs, or 342-022x-B then your 400K drive may require the REV B ROMs or better. Apple revised the original 64K ROM once for changes in a later model stepper motor. Im not sure exactly how this problem manifests as the drive model numbers offer little help in determining which you have. However, considering everything else you've tried, it's worth a check.
http://support.apple.com/kb/TA34190?viewlocale=en_US
Thanks for the help but the diskdrive and cable works fine with another Mac, so the problem is on the logic board. I have tested this logic board with another Macintosh (128k) and it doesn't work.
The problem i surely in the logicboard but I cant locate it.
Thanks Mac128 , I think You found the problem. According to Apple Support my sony drive needs the ”B” ROMs. ” "-B" ROMs are only compatible with the Sony OA-D34V-22 or OA-D34V-02 drive. Earlier drives "OA-D34V" used the "-A" ROMs” http://forums.macrumors.com/archive/index.php/t-1539356.html
The problems is that it wont work with my ”B”ROMs.
I have tried both the internal floppy drive (Sony OA—D34V-22) and an external drive (Apple M0130) connected to a Plus board ( ROM HI: 342-0341-B, ROM LOW: 342-0342-A) and everything is working perfect. Now I have two 512k boards to test.
The first 512k board (512k1) was together with the Sony drive in the Macintosh that i bought on Ebay. It was sold as not working so that is OK.
512k1 board is number 630-0118, ROM HI: 342-0220, ROM LOW: 342-0221-A. When I connect the floppy drives it will not boot. Just happy Mac, disk is spinning but stepper motor not working.
Recently I purchased another 512k board (512k2) sold as not working. 630-0118, it has ROM HI: 342-0220-B, ROM LOW: 342-0221-B. The same result when trying to boot from floppy.
The ROMs are cleaned and reseated , swithing the two ROMs between the 512k boards made no difference.
Obviously it may be better to buy working Macintosh instead, but it would be interesting to locate and solve the problem if possible.
Is it safe to put the two ROMs from the Plus board in the 512k boards?? Should it work?
Is it common that ROMs are defect??
Many thanks for all Your advice
The problems is that it wont work with my ”B”ROMs.
I have tried both the internal floppy drive (Sony OA—D34V-22) and an external drive (Apple M0130) connected to a Plus board ( ROM HI: 342-0341-B, ROM LOW: 342-0342-A) and everything is working perfect. Now I have two 512k boards to test.
The first 512k board (512k1) was together with the Sony drive in the Macintosh that i bought on Ebay. It was sold as not working so that is OK.
512k1 board is number 630-0118, ROM HI: 342-0220, ROM LOW: 342-0221-A. When I connect the floppy drives it will not boot. Just happy Mac, disk is spinning but stepper motor not working.
Recently I purchased another 512k board (512k2) sold as not working. 630-0118, it has ROM HI: 342-0220-B, ROM LOW: 342-0221-B. The same result when trying to boot from floppy.
The ROMs are cleaned and reseated , swithing the two ROMs between the 512k boards made no difference.
Obviously it may be better to buy working Macintosh instead, but it would be interesting to locate and solve the problem if possible.
Is it safe to put the two ROMs from the Plus board in the 512k boards?? Should it work?
Is it common that ROMs are defect??
Many thanks for all Your advice
It is safe. Just turns the computer into a 512Ke. Which means, if you so choose, you can replace the 400K drive with an 800K unit and run up to System 6.0.8.
-J
-J