I'm doing the unthinkable: I've bought a couple Commodore 64c
computers to take apart for parts for experiments. In particular,
I'm after the late-model SID chip for some Netduino projects. The early
model chip was 12v and ran really hot. The late model MOS 8580
sounds a bit different, but was also more reliable and ran cooler
at a lower voltage. I need a bunch of these, and they are getting
harder to find (some of the ones on ebay are counterfeit forged
chip packages with something completely different inside)
The C64 has a dear place in my heart; mind you, I owned a C128,
so that's what really tugs, and what I refuse to destroy, but the
C64c was the sexy late-model replacement for the breadbox.
I've looked inside the old breadbox C64s before, but I've never
cracked open a C64c. Once I removed the keyboard and all the RF
shielding/heatsink, this is what I found:
If I am reading things correctly, it looks like this model is
from December 1988 (going by the code at the bottom and the yellow
sticker on the cartridge port). The sticker on the bottom said it
was factory reconditioned; not sure which part(s) they
replaced.
When the modified the board from the original C64 to the late
model, the chip count was generally reduced, especially in the 64k
bank of memory. Rather than 8 or so chips, it looks like the count
was reduced to 2.
This motherboard may not seem small in an age of Netduinos,
netbooks, and multi-ghz mobile devices, but at the time, such a
compact unit was a revolution; especially if you ever looked at
those same-era IBM motherboards. Remember, this has everything
(video card, memory, CPU, device bus, joystick controllers etc.)
except for the power supply, all right in this small keyboard-sized
package about the size of a big laptop. All through-hole
hand-soldered (no miniaturized surface mount tech here). I've seen
hobby projects with more complex boards. Impressive.