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Re: 6502 illegal opcodes questions
On Mon, 5 Jun 2006, mdj wrote:
Yeah - I used to think the best approach would've been an additional
softswitch and an extra ROM chip, providing absolute compatibility with
the old AutoStart ROM. Considering the cost of manufacture of the IIe,
it would've been a simpler solution.
If you're only running 48K apps on DOS 3.x that's easy. Use NEWBASIC
LOADER from Beagle Basic to load FPBASIC off the 1980 DOS 3.3 System
Master. Presto. Apple ][+ ROM on the LC.
That said, the engineers that wrote the IIc and enhanced IIe ROMS (I'm
not much of a fan of the original IIe ROM) did a fantastic job.
I never cared for the 6502 //e ROM either. Bug city. Ew.
I never really did understand why they licensed a new BASIC from
Microsoft instead of expanding Integer to include the missing features.
Because their own project got bogged down in details...
-uso.