[sdiy] Anybody using Atmel AVR?

[Kenneth Elhardt]

Andreas Gaunitz writes:
>>I just bought an Atmel AVR programmer. Anybody here using Atmel for
musical projects?<<

I believe the Encore UEG (for MOTM synths) uses the Atmel.  Probably the
frequency shifter too.

Tom Arnold writes:
>>I would *kill* to find an 8052AH-FORTH, or at least a dump of the ROM so I
could try it on a more modern flavor of the 8052...<<

Note that writing a Forth interpreter can be quite simple and might be
pulled off in just a few days.  Also if you're into Forth, there are Forth
chips such as the ancient Novix NC4000, and doing a web search also brings
up ForthchipS2020.

Phil Harbison writes:
>>We never had a problem finding static RAM that could keep up with a 1 or
2MHz 6502. The problem was dynamic RAM. What do you do when you need to
refresh the RAM? It is fairly easy to piggy-back a refresh cycle onto every
memory cycle (and the Z-80 would even do this for you) but not very
practical if that means doubling the duration of each memory cycle.<<

I seem to remember seeing source code for software memory refresh on some
VME based CPU, probably 68K based.  Basically the CPU just used an interrupt
routine to read a consecutive 128 or 256 bytes periodically (or however long
the DRAM row or column was).  Don't know how much percentage of time that
would consume on a 6502, but it might be better off than doubling memory
cycles and it's sure easy to impliment.

-Elhardt