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Scored a Silkscreened Drexel 128K Mac!

jsarchibald

Well-known member
As you may have seen on another thread or two (eBay finds and an older Drexel Mac thread), I scored a Drexel Mac for the princely sum of USD$199.95.  However, add in GSP to get it to Australia of USD$138.28, and then a handy credit from eBay of USD$14.35 (or AUD$20), and I’m left with a bill of USD$323.88.  Then, as it turns out, the seller sold the mouse separately, to our very own Unity.  He was kind enough to agree to part with it in order for my Drexel Mac to remain complete and original, so I parted with a further USD$62.75, for a grand total of USD$386.63, or $544.55 in Aussie dollars.

Which brings me to my delivery of goodness yesterday, waiting for me when I got home.  I unwrapped it in record time, and it has survived the transit halfway around the world to my doorstop.  Whilst I’m struck by how tidy the unit is, with no scratches, gouges or cracks, it is far dirtier than I was anticipating.  Why is every old Mac I buy dirty as hell, but every single one I sell clean as a whistle?  Just once, is it too much to ask?!  Anyway, I find the cleaning process cathartic, and over the next few hours, wipe down all of the dirt, even cleaning the top grilles vent by vent with a cloth and thumbnail, until it comes up looking great.  No stains, no marks, no pen, and consistent but very minimal yellowing.  One of the feet is missing, and the ones on the keyboard are a little sticky, but I can easily fix both of these issues.

When I went to open the Mac up, I noticed that all of the case screws were black (I’m used to 3 black, 2 silver), had no marks or chips on them, and they all felt to be the same tension, so I am thinking this may not have ever been opened.  There was a little bit of corrosion on the top terminal from a battery leak, but that’s the full extent of any damage, and the battery compartment is spotless otherwise.  The dust inside the Mac though was plentiful, but I just got an electric leaf blower for Christmas, so 30 seconds of blasting and most of the dust and tiny webs are gone.  Inside looks promising, as I see a Sony OA-D34V installed with a November 1983 date, the early grey cover on the side of the analog board, and an original 128K board.  It has a 44th week of 1983 Motorola 68000 chip, RAM with the Apple logo on them, and a ROM LOW 342-0221 and HI 342-0220-A.  All seems to be original, great news!  The Mac is a 5th week of 1984, and the keyboard and mouse are both 6th week, so very consistent.

When I bought this one, the seller said it turned on but wouldn’t take a disk.  I haven’t tried to turn this one on yet (must remember to use the step-down transformer for 110V!), and don’t intend to until I’ve cleaned everything up and gotten the floppy drive working.  I got it disassembled last night and started to clean out the gunk that used to be grease, but I haven’t been able to get it to cycle a disk just yet – a job for tonight.  The pictures of the auction show it booting to the screen where it asks for a boot disk, so that indicates all is well if I can get the drive to read media.  At least this one still has its felt pad to hold the media to the read head!

Below are some pictures of the part numbers and date codes, would appreciate those in the know (I’m looking at you Unity!) to let me know if any of these seem out of place (ie. Replaced at some point).  Also not sure if the apparent repairs on the bottom of the drive are from the factory, or were done later.  Once I have everything cleaned, serviced and working again, I’ll take some more pictures and update this thread.  Very surprised just how crisp and clean the Drexel logo is, considering it’s now 33 years old.  It seriously looks like it has just been done, no fading or wearing off at all.





















 

unity

Well-known member
Wow! So glad it arrived safe. Hopefully the mouse is not far behind!

I can say this, that is in very original condition. Yes, four black screws but I dont recall if they are all the same. For the upper ones and behind battery door, they may be corse thread. Also they are anodized so they scratch easy if every tampered with. If they had no marks/silver showing then you may be the first to open.

Notice the dark grey sweep board backing. That was only found on the very early ones and is FREQUENTLY missing. I think mainly due to failed sweep board swaps. My DrexMac has the same dark grey one.

Roms - Its pretty normal that the first set had no -A, etc. I am not sure when they decided to add the revision number. I think mine might have no -A on either ROM. I will have to open mine again so we can compare, being that mine is a week 6.

Also dont forget to look across the very top of the sweep board for the "diffuser" that was in fact a death wish for the early units. Meant to diffuse heat, maybe to not melt plastic vents? Instead it trapped heat in the fan-less Mac. Cant miss it, long metal thing. Often removed, but I bet yours is there.

 

jsarchibald

Well-known member
Yep, sure is there, I wiped it down last night.  First one I've come across with it installed, and because it's been a little while, I didn't even bat an eyelid about it being there.  Should have noticed it immediately!  I won't be using mine for long periods, so it'll be left in place for posterity.

I also don't recall the other 400KB drives being like this one either, seems to be a very early one.  Will need to wrap my head around it and fix it properly.  I have a 4 day weekend coming up, so I plan to have this fixed and working perfectly, after which I'll take a ton of pictures for the thread.

I can see that the mouse departed Sydney yesterday, so hopefully it turns up sometime this week so I can get a picture of the whole family!  Thanks again for your help.

 

unity

Well-known member
I dont recall the drive date in mine, I think yours might be older. If so, it may look a little odd in front. If you remove it, take pics please. I think its my Drexel that has a different copper heat sink tab on the front that differs from every other 400k drive I have seen. Not a big deal or anything, just something I noticed.

 

jsarchibald

Well-known member
Can definitely confirm this is all original, none of the screws have any wear, and it appears to be in excellent condition. Just finished servicing the drive, should read like a champ now.

Interestingly, I looked at the serial numbers on Drexel macs. All are week 6 of 1984, and I found one on the M0001 Registry, the one that sold on eBay last year, and a fellow members Drexel. They were the 4330th, 2585th, and 3510th made that week. Mine however appears to be 435th made. Now if they only made 1850, they must not have been made sequentially. However, the serials are all divisible by 5, so it must have gone down a particular line for the Drexel run. Funny what you find, even 33 years later!

 

Trash80toHP_Mini

NIGHT STALKER
There's also a logo differential. The first run for the students of the Drexel University class of 1988 appears to have the silk screened, color logo. My example has the Drexel logo cattle branded into the plastic. I wonder if it might have been a generational change by graduating class or a differentiation between student/faculty/institutional purchases. The Plus "upgrade" done to mine might actually be a model year change OEM kinda "mod" that's relevant to the intro of the Mac Plus. Dunno, fascinating stuff!

Uploads of closeups of the D-Logo of a very large size from all owners for comparison would be much appreciated. Links to offsite hosted photos are filtered out at work, but the ones hosted here come up just fine. I'll reply in kind as I happen to be setting up a Mac shoot ATM.

 

unity

Well-known member
The silk-screened Drexel Mac came off the line from Apple with the logo, so these are the official Drexel Macs so to speak. I think 1,850 were made. This was part of a large purchase by Drexel for computers re-sold to students. But a good number went in for facility use too. The logo was not a request by Drexel and done as a surprise for Drexel. Of course Drexel bought more for internal use and those received branding logos instead, like other equipment did.

As for week 6. Yes it seems most are week six but I think I recall one not being. I would have to see if I save info on it, could be wrong.

 

jsarchibald

Well-known member
Correction, the Mac is week 6, the keyboard week 5, and the mouse week 2. I guess it's possible for this to have happened in the early days, I recall a story over at Folklore when there was no reason or rhyme for serial numbers at the start.

 

unity

Well-known member
Yeah, the mice and keyboards were made at different rates. As the year went on they sync up a little more then toward the end of year it gets weird.

In the start the mice/keyboards were easier to produce and probably quicker. While I know I have mice from several weeks, I would not be surprised is some weeks had zero made, especially when Mac sales did not excel. So I am pretty sure there are lots of early Mice/Keyboards out there made before the Mac itself really got rolling off the line. So in the beginning, it was more probably to have a Mac with a mouse/keyboard that was older. Then things synced up. Then I found systems were the Mac itself was the older in later 84. So while some like to claim "matched" serials, there really was no such thing. Usually they are close, within a week or two or same. But they are not always the same exact week.

 

jsarchibald

Well-known member
After cleaning and lubricating the drive last night, I was pretty happy with its operation, and was confident it would work.  As requested by Unity, please find pictures of the drive below:







Then I put it all back together again, below are some more pictures of the inside, including the metal heat diffuser missing from most 128K's:







 

Trash80toHP_Mini

NIGHT STALKER
Very nicely done. Gotta love it. Here are the shots of the cattle brand on my DrexelMac:

DrexelBrand-0.jpg

DrexelBrand-1.jpg

Tough to get a pic that does it justice, looks very elegant in person. Have you got any info on what happened in the following class years at DrexelUniversity? Did they switch to PCs? You said other equipment was branded. Apple peripherals etc. or equipment in general. Who did the branding? Linkage please! [:)] ]'>

 
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