It sounds like you need a ROMX from theromexchange.com.
You don't say if the programs that crash work on an enhanced IIe, or
just regular IIe. That would probably mean usage of an unsupported
opcode that doesn't work on enhanced machines.
I know the CALL -3100 command to enable graphics doesn't work on the
Laser. Not sure about the IIc.
Are we talking all programs with graphics, the ones that crash that is?
A list of the programs that don't work would be handy.
Although I understand where you are going. I had the same thought at
one time to install a IIe ROM into my Laser for more compatibility.
Instead of changing the ROM though, probably an easier idea might be to install the enhanced ROM's software into the Laser or IIc's Auxilliary Language Card, set the soft switches that puts the Auxiliary memory in control and run the software from there. The only time it won't work is
if the programs are booted from disk.
I've sometimes run into the occasional program that crashes or
malfunctions on an Apple //c or a Laser 128. So some time ago I had the
daft idea of trying to get the Enhanced //e ROM running on both.
Obviously, it's not quite as easy as just putting the right ROMs in the right place, or there seems to be differences between how all 3 systems bankswitch the ROMs.
I know it's a stupid idea but it's something I would like to experiment with.
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