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DG Systems

I am no longer active in this hobby for the foreseeable future. 
I will no longer maintain or update the website, but I will leave it accessible to the web for as long as possible (years).

 

DG Systems
Bytemaster
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Phideck
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Mark-8 Minicomputer
Apple-1
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Imsai 8080
Kenbak-1
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LSI ADM-3A
ASR-33
The Digital Group

 

 
Digital Group Z80 Restoration Photos

If you haven't been there yet, be sure to view The Digital Group home page on my site!

This picture page documents the restoration of a Digital Group "System", less circuit boards. A Digital Group system consisted of a cabinet, a mother board--mini or standard, a low current power supply and a high current +5 Volt supply--of which three were available, and at least three circuit boards--CPU, I/O and Video & Cassette. The System Cards have their own page. 

My restorations consist of a complete system breakdown, cleaning, refurbishing, and reassembly. Sounds easy, huh? Just a guess, but it probably takes me around 200 hours to do what you see here. Good thing this is just a hobby!

The restorations shown here are just two that I have done. Most of the photos are from a restoration I did in 2007 for another collector in trade for some DG equipment. The photos show the work from start to finish, though not in tremendous detail. The other restored system is shown completed only--no photos were taken of the work. I was busy, what else can I say? You can tell them apart by the power supplies. The second system went to a museum in Texas a few years ago, oh but don't worry--I still have good collection of my own!
 

IMG_2125.JPG (1282986 bytes)
A fully restored Digital Group System, now living in Texas

Restoration

The power supplies in this system needed some close attention. The low current supply (the one with the silver caps) had an unusual power transformer unlike those I have seen from Digital Group. I concluded that this must be an after market replacement. Since originals are hard to come by, and since I have no extras on hand, I chose to restore this one by cleaning and painting it to look like the original. The results were quite good as seen in the photos below, the transformer was painted black and a duplicate of the original label was attached. Only a true DG snob will notice the fake! :) Then again, for all I know, it shipped from the factory like this--maybe they ran out of the originals. The other power supply needed a lot of work to clean up, but all went well. The red "Danger" sticker is a non-original, placed for safety sake.

The system had some extra holes drilled into the back, and I thought, what the heck--I'll patch them! So I did. I taught myself to weld aluminum--still have some learning to do--but it worked well enough. The repair is almost unnoticeable in the finished machine. Visible in the pictures is the brushed aluminum finish that I do to clean up most of the cabinets I restore. Over the years, the cabinets loose that "new shine" from getting bumped around. I use a belt sander to re-brush the finish to like new. Painted surfaces are either stripped down to the bare aluminum and repainted, or just touched up with an airbrush depending on condition. 

And now, the before photos:

 

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dg_restore_011.JPG (1374514 bytes) dg_restore_012.JPG (1519453 bytes) dg_restore_009.JPG (1421656 bytes)
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dg_restore_049.JPG (1793800 bytes) dg_restore_053.JPG (1853445 bytes) dg_restore_054.JPG (1733227 bytes)
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dg_restore_021.JPG (1708467 bytes) dg_restore_036.JPG (1703110 bytes) dg_restore_038.JPG (1782338 bytes)
dg_restore_082.JPG (1449630 bytes) dg_restore_040.JPG (1378903 bytes) dg_restore_039.JPG (1400273 bytes)
dg_restore_041.JPG (1581025 bytes) dg_restore_043.JPG (1219528 bytes) dg_restore_044.JPG (1644860 bytes)
 

Reassembly:

 

dg_restore_047.JPG (1377539 bytes) dg_restore_045.JPG (1329429 bytes) dg_restore_056.JPG (1311826 bytes)
dg_restore_071.JPG (1918082 bytes) dg_restore_070.JPG (1455322 bytes) dg_restore_073.JPG (1624847 bytes)
dg_restore_072.JPG (1533934 bytes) dg_restore_067.JPG (1912472 bytes) dg_restore_090.JPG (1411025 bytes)
dg_restore_095.JPG (1665112 bytes) dg_restore_093.JPG (1729043 bytes) dg_restore_094.JPG (1681466 bytes)
dg_restore_098.JPG (1420659 bytes) dg_restore_100.JPG (1544033 bytes) dg_restore_102.JPG (1457387 bytes)
dg_restore_104.JPG (1386316 bytes) dg_restore_109.JPG (1690611 bytes)
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Second System: 

 

IMG_2134.JPG (1228460 bytes) IMG_2135.JPG (1250414 bytes) IMG_2136.JPG (1283292 bytes)
IMG_2143.JPG (1876133 bytes) IMG_2144.JPG (1495541 bytes) IMG_2137.JPG (1134796 bytes)
 


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Copyright 2008 Bryan's Old Computers
Last modified:
October 16, 2009