Using a Stamp as an EPROM emulator

shawnerz

All,
I'm new to the forum.· I've got minimal experience with a BS1 and a Counterfit Stamp from several years ago.
I have a project idea and I'd like to know if it's feasable to do with a Stamp.
Basically, I'd like to build a 27C64/27C128 EPROM emulator using Stamps.
I have some old '286 laptops that have their BIOS stored in 2, 27C128 EPROMS.· These EPROMS are in an odd/even byte configuration.
Rather than edit, download, burn, and test BIOS changes, I'd like to use 2 Stamps as an In-Circuit Emulator (ICE).
Are there any obvious "gotchas" that I may have over looked.· The clock speed on the laptop is only 16 MHz, so I don't think timing will be much of an issue.
Should I use the BS1, BS2, or Prop for it?· Will the cost outweigh the advantage of making changes more or less "on-the-fly"?
Thanks in advance,
-Shawn

Mike Green

A BS1 or BS2 will certainly be too slow. A Propeller would have the memory and speed. An SX would be fast enough, but doesn't have enough memory for the EPROM images.

allanlane5

Wow, welcome back to the 1980's.

Nope, you're in an "EPROM" write, burn, try, erase, write, burn, try again cycle. I THINK MAXIM has some static RAM parts with on-chip battery backup that might speed up the process. But no, a BS2 is WAY too slow. Yes, the cost would outweight the advantage.

shawnerz

Yeah Alan, it is "back to the 80's." [noparse]:)[/noparse]

Thanks for the Maxim tip.· I'll have to check them out.· Thanks to you, Mike, as well.

-Shawn