User`s guide

20
PREPARATION
DECIDING ON WHETHER TO USE THE REPLACEMENT ROMS
Replacement of the existing ROMs is optional, however, the memory test routine in the OS ROM
corrupts the RAM disc on start-up and the cassette tape routines access the real tape I/O. If you
don't remove the existing ROMs containing OS and BASIC and use the replacements supplied with
REMEMOrizer, your RAM Disc can be corrupted at boot time, and you won't have the ability to use
virtual cassette tapes.
If you remove the ROMs containing OS and BASIC, set the ROMs jumper "high". REMEMOrizer will
provide replacements. These don't corrupt the RAM Disc and are modified so that the cassette
load/save routines access virtual cassette tapes.
Warning: Do not set the jumper "high" if your MTX still has the ROMs containing OS or BASIC.
Both the motherboard and REMEMOrizer will attempt to drive the bus when these ROMs are
accessed, which could result in permanent damage to the MTX and/or REMEMOrizer.
If you do not wish to use the replacement ROMs, ensure that the ROMs jumper is in the “L”
position and leave the existing ROMs in place.
If you do wish to use the replacement ROMs, you need to identify which version of the MTX
computer board you have :-
4004 Computer Board 4005 Computer Board
ROM Name Location Size Contents
ROM Name Location Size Contents
ROM B 8H 8 KB ASSEM
ROM B
8H 8 KB BASIC
ROM A
9H
16 KB OS&BASIC
ROM A
9H 8 KB OS
10H empty ROM C 10H 8KB ASSEM
If you remove the ROM(s) containing OS and BASIC, set the ROMs jumper "high".
If you don't remove ROMs containing OS and BASIC, set the ROMs jumper "low".