>>>>> "DG" == Daniele Gratteri <daniele_gratteri@inwind.it> writes:
MV> the least amount of chips and wires possible, which is why I'm
MV> piggy-backing 6264's onto the kernal and basic rom. I'm also
MV> thinking about
DG> I also have got a VIC-20 I want to expand in the simplest mode.
DG> Can you tell me what are 6264's chips? I don't know how the VIC-20
DG> works very well...
I'll try to write something up when I'm done. The current projects on
Funet all require logic chips and a small PCB, I'm aiming for just
wires and memory chips.
6264's are 8K Static RAM (SRAM) chips that are almost pin compa-
tible with 2364 ROM chips. This enables you to solder the 6264 on top
of the ROM chip (aka piggy-backing) and just rewire 6 pins, instead of
having to wire all 28. It's a quick and dirty solution, but it works.
The Vic-20 is a *very* simple computer, almost everything is done
with standard 74xx logic chips. Check the scematics on Funet,
http://ftp.funet.fi/pub/cbm/schematics/computers/vic20/
--
___ . . . . . + . . o
_|___|_ + . + . + . . Per Olofsson, konstnär
o-o . . . o + MagerValp@cling.gu.se
- + + . http://www.cling.gu.se/~cl3polof/
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