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Author SHA1 Message Date
Andy McFadden
d3e00b2342 Add Apple IIgs I/O locations in bank $E1
The $Cxxx I/O locations are mapped into banks $E0/E1, and are usually
configured to appear in banks $00/01 as well.  Direct access to
locations in banks $E0/E1 is common in 16-bit code, but we only had
definitions for $E0.

This adds a clone of definitions for $E1, and renames the symbols
to be _E0/_E1 instead of _GS.

This can also be solved with MULTI_MASK, but that will always use
$E0 as the base address, so references to $E1/Cxxx will have a large
adjustment added ("+$10000"), which is kind of ugly.

Note we still don't have definitions for $01/Cxxx.  I'll add those
if I run into them in 16-bit code.  (That might be a reasonable use
of MULTI_MASK; feels less ugly somehow.)
2020-11-03 11:54:25 -08:00