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Original Macintosh Model M0001


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I received from a friend a couple of years ago an original Macintosh Model M0001.  Serial number F4400ZXM0001.  myoldmac.net says it was manufactured in Freemont in the 40th week of 1984 and was the 1153 computer made.  Currently the display appears to be working, but was is both a repeating beep on the speaker, as well as alternating black and white vertical bars on the screen when I turned it on the first time.  Second power on, to see if there was any noise from the fly back transformer, bars still on screen, but no beeping and no noise from the fly back transformer. 

 

Due to the age, I'm guessing that the electrolytics have all dried out, if they have not failed otherwise.

 

It came with keyboard, numeric keypad, mouse and external floppy drive. as well as a female DB25 port where the battery cover is.  It also has a DB 25 male to DB 9 male cable, as well as a over the shoulder fabric carrying case.

 

Until it has been repaired, or at least until I've cracked the case, I don't know if there have been any modifications to it like getting a 3rd party memory upgrade or an original Apple upgrade to 512k.  Here's hoping that a recap will restore it to working.

 

Thank you to @JDW for the youtube walk through on recaping the analog board.

 

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@Anathae

Thank you for letting me know my video helped you.

 

I highly recommend doing keyword searches through the Dead Mac Scrolls because you can lookup topics and find recommended solutions that way.  The book talks about unusual sounds and bars too.  In most cases, you have fried parts you will need to replace.  The book discusses those.  Many are found on Mouser.  But of course, you will need to meet their minimum order to qualify for free shipping.  But if you buy a batch of capacitors to completely recap your Mac and other devices, you probably will qualify.   Please let me know if this helps.

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19 hours ago, JDW said:

@Anathae

Thank you for letting me know my video helped you.

 

I highly recommend doing keyword searches through the Dead Mac Scrolls because you can lookup topics and find recommended solutions that way.  The book talks about unusual sounds and bars too.  In most cases, you have fried parts you will need to replace.  The book discusses those.  Many are found on Mouser.  But of course, you will need to meet their minimum order to qualify for free shipping.  But if you buy a batch of capacitors to completely recap your Mac and other devices, you probably will qualify.   Please let me know if this helps.

 

Excellent, my google foo had not found this document yet.  Ctrl-F found on page 65, no start up sounds, and vertical bars.  It references a 512k logic board and issues with the ROM.  Considering the age, and the number of times this unit has been moved, having the ROMs not being properly seated makes sense.  I'll try and reseat them before attempting the recap.  This also suggests that this may have been upgraded to the 512 logic board, which makes sense considering the original user.  He worked as a Systems Analyst specializing in DEC Vax and later DEC VMS systems.

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I'd love to see a photo of your ROMs before you remove them, not only to see their orientation but also to see the part numbers.  (There were Revision A & B 64K ROMs in the 128K & 512K, and then the 512Ke and Plus used newer 128K ROMs.)

 

You probably don't have an anti-static mat or grounding wrist strap, so I would recommend you work on a wooden surface and avoid standing on carpet.  If you can touch a pipe or otherwise ground yourself, then that's really best.  These old electronics were more sensitive to static zaps than chips of today.

 

You probably also lack a ROM puller tool.  Even without that, you can still pry out the chips by fitting a very tiny flat-head screw driver just under one side of the chip and then twist a little.  It might dig into the plastic of the socket a bit, but I'm not such a purist that I really care about that.  Then repeat on the other side of the chip.  You don't want to pry up only one side because if you do that and pull off the chip, a couple pairs of pins on the opposite side of the chip will get bent a little bit.  If that happens, you can take needle nose pliers and carefully bend them back.  Just take care not to break off a pin.  Soldering pins back on isn't impossible, but it's harder than you think.  I know, because I've done it.

 

I look forward to hearing how your ROM reseating goes.  Hopefully that cures your problem because that really is one of the easier tricks in the book! :-) 

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21 hours ago, dochilli said:

If the ROM is defect you can replace it with an EPROM. 

 

Actually, there's nifty ROM kit available for purchase here:

https://www.bigmessowires.com/mac-rom-inator/

 

I don't have one of those, but from reading the comments on that page, it seems that you could opt to even use the original 64K ROM with it, so long as you zero-out all the other data on those 1MB ROMs.  And of course, you could burn the 128K ROMs, plus have other fun software in ROM too.  

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On 3/24/2021 at 6:48 AM, Anathae said:

It came with keyboard, numeric keypad, mouse and external floppy drive. as well as a female DB25 port where the battery cover is.  It also has a DB 25 male to DB 9 male cable, as well as a over the shoulder fabric carrying case.

 

Until it has been repaired, or at least until I've cracked the case, I don't know if there have been any modifications to it like getting a 3rd party memory upgrade or an original Apple upgrade to 512k. 

 

 

That, my friend, is an upgraded machine ... if you’ve got a DB25 in the battery port, there’s almost certainly a SCSI upgrade in there, which means you probably also have a nice memory upgrade like a Dove MacSnap or a Levco MonsterMac.  Nice find.  Looking forward to hearing what you discover.

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20 hours ago, Crutch said:

 

That, my friend, is an upgraded machine ... if you’ve got a DB25 in the battery port, there’s almost certainly a SCSI upgrade in there, which means you probably also have a nice memory upgrade like a Dove MacSnap or a Levco MonsterMac.  Nice find.  Looking forward to hearing what you discover.

 

I'm also thinking that the 25 pin adapter is for SCSI.  @JDW has pointed me at the dead mac pdf and it indicates that the alternating vertical white and black bars are a ROM issue, and as such, I'll have to open it up and will report back (with pictures?) on what I find.

 

Thinking that I may want to sell this thing if I get it working again.  It's been a rough year, and plugged in and running computers way out number humans in the house.  It would be nice to know it's being used by someone who can appreciate it.  I should get the failed hard drive in the 32 bit intel iMac replaced...

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