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Z80 CPU
8080 CPU
6500 Series
6800 CPU
DG Systems
Bytemaster
System Cards
Keyboard
Printer A & B
Phideck
Disk Drives
Documentation
Software
Flyers
Magazine Ads
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| 8080 Processor Board
Along with the 6800 and 6500 series, this board was among the first
processors originally offered by The Digital Group. It was also the preferred
processor of that group, and along with the Z80, the only processor
supported with DG software.
When the Z80 was introduced, sales of this processor fell off the map
and only those who had some special reason for using it, or those unaware
of the Z80 were inclined to purchase the 8080. It was also $50 less
expensive, so I'm sure that was a factor in continued sales, but for many
reasons, this is a rare item.
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Fully (almost!) Restored 8080 Processor Board
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| Restoration
Most of the CPU boards I have acquired were in poor condition,
sometimes due to poor assembly techniques or frustrated repair attempts,
or often to an accumulation of small modifications poorly done or rushed.
Combined with the effects of time, most of my boards require some
restoration to make them operate again. Coupled with the fact that DG used
the cheapest of the cheap IC sockets available, nearly every board made
has intermittent problems that can often be cured only by replacing all of
the aging sockets.
Whatever the condition, I never, ever power up any board without a thorough
clean up and inspection under a magnifying glass. every board is evaluated
carefully to determine the level of restoration needed. Sometimes this is
just a good cleaning with minor solder clean up, other times it means a
total tear-down and rebuild. If the circuit traces have lost plating or
corrosion is visible on the board top side, tear-down is the only way to
go.
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Bare 8080 Processor Board, Solder Side
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| The restored 8080 shown here is the same one in
the photos below. I received it in poor condition, and restored it as
shown above. Some of the reasons why I chose to tear-down this board were
the use of dissimilar IC sockets--I hate that!
As seen here, I have yet to power this board up. The tags seen on the
chips are an indication that I have verified the chips as operational,
part of my routine, but I haven't finished researching the modifications
found originally on this board. I need to cross check with the
schematic--something I just haven't gotten to yet!
8080 Card Information
8080_cpu.pdf
- This is all I have on the hardware. :( Can you help with more? Please
let me know!
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8080 Processor Board, Layout
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Photos Before Restoration: |
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Too many things wrong here to even count
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Sub-par solder job--unknown mods
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Full tear-down, this is as far as I went
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