Heathkit ET-3400

From: Allison J Parent <allisonp_at_world.std.com>
Date: Wed Jul 8 07:30:48 1998

< old Altair hackers, so.... How hard would it be (for a software guy) to
< replace the ROM with something else, say, a parallel cable from a PC that
< fed data through the ROM socket?

not easy at all. You really need to make or buy an eprom emulator that can
do 6830 (an oddball pinout).

< The clock is already very slow, 500KHz, I think, but I could slow it to
< 1HZ if it would help. Could I software decode the address, do whatever
< handshaking I need to do from the TTL-levels on LPT1, and emulate a ROM
< without buying a ROM emulator?

Not possible, there is a minimum clock spec as the internal registers are
dynamic and would forget.


Allison
Received on Wed Jul 08 1998 - 07:30:48 BST