I'm just cleaning up my room and finally decided to open up my VICs to
get the missing board markings. I also got an interesting C64E :-)
Nicolas Welte wrote:
> C64E |250469 |U7 |CT1 |8565 |J3 zu |8562 |J3 auf
>
> This is the completely redesigned small board with HMOS chips and the 64pin
> gate array chip. There are two versions: 250469 rev 3 and rev 4 have the
> 251715-01 gate array and an 2114 color RAM chip, but 250469 rev B has the
> 252535-01 and no separate color RAM chip. For simplicity we could refer to
> this last version of the C64 as the C64E2, though I never saw it being called
> this way in a Commodore document. I think both of them are Copyright 1987.
I found another revision of the C64E, i.e. the small board WITH color
RAM chip. It is simply called 250469 rev A, and I couldn't see any
obvious differences to rev 3 and rev 4.
Now for the VIC-20. Someone told me that NTSC versions usually have
different board revisions, but still there should be only two major
board versions: the large original VIC20 board, and the small VIC20CR
board. The main differences are the board size, the power input jack,
the voltage regulator circuit and the type and number of RAM chips used.
I'm missing a VIC20CR NTSC, so maybe someone else could fill in this
hole?
VIC20:
large board
two prong power input, 9V AC (3A)
large internal heatsink, LM323 regulator in TO3 metal case
eleven 2114 SRAM chips (1k x 4)
board markings (PAL version):
top:
V C 20 (sic! they must've erased the "I")
ASSY NO. 324003
(C) 1981 COMMODORE INTL
KU-141T94HB (larger font than above)
bottom:
FAB NO. 324002-02
REV.D
board markings (NTSC version):
top:
VIC 20
ASSY NO. 324003
(C) 1981 COMMODORE INTL
(T) TP-S08HB
bottom:
FAB NO. 324002-01
REV.D
VIC20CR:
small board
7pin DIN power input (C64 like)
no internal voltage regulator
two 2016 SRAM chips (2k x 8)
three 2114 SRAM chips (1k x 4)
board markings:
top: none
bottom:
VIC 20 FAB NO. 251040-01
ASSY NO.250403 REV.D
(C) 1982 COMMODORE INTL
Nicolas
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