5V tolerant programmable logic

From: Marko Mäkelä <msmakela_at_gmail.com>
Date: Wed, 3 Feb 2010 11:22:49 +0200
Message-ID: <20100203092249.GA1246@x60s>
Hi all,

> - The PDF says: "I/Os are not 5V tolerant". I see a lot of resistors to
> handle this.

For what it is worth, I have finally resurrected the Vic-20 all-in-one
Flash+RAM cartridge project from near death.  I have lacked the motivation
to finish the software; the hardware is OK since several years ago.
Watch this space for a release announcement in the next few weeks.  We will
release all plans and code for DIY people; I am not going to mass produce it.

All parts are 5V.  The Am29F032B is probably the largest useable flash memory
(4 megabytes, 8 bits wide, 5 volts, TSOP package).  The 32k SRAM is a 62256,
TSOP.  The logic array is a Lattice 1016 in TQFP package.  It is definitely
too small for emulating a 6502, but there are bigger chips in the family.
I have not done the VHDL or touched the mouse-wiggling software for doing
that.  I merely specified the needed I/O registers to my friend who did it.


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Received on 2010-02-03 10:00:22

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