William Chops Westfield wrote:
>
> Signetics/Phillips had an AP-note some time ago using an 80451 as a
> printer buffer.  the interesting bit was that they used a SIMM as the
> buffer, and drove the address lines directly from the micro, doing
> RAS, CAS, refresh, and etc all in software...
> BillW

I did a printer buffer some time ago with a Z80 that addressed from 8K
to 4Mb in Dram dips, simms, or combinations thereof. It is all done with
software and has only a 74LS00 and a 74LS04 to hardware interface to the
Drams. I figured I could use the Z80 to address 64Mb before I needed any
additional address decoding logic.

My full source code and schematics in PDF format can be found at:
Don's Download Dungeon http://www.dontronics.com/download.html
I hope someone can learn something from this now dated project.

This was in the days when I could really remember that I wrote software,
and knew when it was bed time as the sun came up to tell me. I gave that
all up. I rise with the sun now. :-)

(Countries that don't have sun, please delete the last sentence.)

Don McKenzie  mailto:don@dontronics.com   http://www.dontronics.com

For more details, send a blank message to mailto:info@dontronics.com
or mailto:simstick@dontronics.com or mailto:basics@dontronics.com