Re: LCD64 Update /Help

From: Ruud Baltissen (
Date: 2001-03-12 08:01:08

Hallo Nick,

> * if I change the 6526 for a 74LS374 I could save the power of this chip;
> anybody know off-hand how many mA?

I'm not a fan of this replacing chips. You may gain some mA's but throw away

> * I could use Flash for off-line mass-storage (I'm not too familiar with
> Flash, I was just going to use battery backed SRAM)

I thought there was a limit on how many times you could write data to it.

> * would turning off the clock to the 6510 reduce power during "sleep" mode
> and is the 6510 static or dynamic??

Running a Rockwell 6502 on 250 KHz made it crash. As a descendent I fear it
is dynamic. There is only one way to find out and that is by changing the
frequency of an original C64. And that may be difficult because of the VIC
and merely of the refresh.

The above triggered the following idea: have you thought about replacing the
DRAMs by CMOS SRAMs? The 64'er design which Prof mentioned could be used to
realize it. You won't loose compatibility.

Another idea: what about decreasing the clock so far that AND the DRAM is
refreshed properly AND the 6510 still runs fine?

Groetjes, Ruud

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