in vb81 Version 1.30
Version 1.30 contains the
following new features:-
- Significantly faster
Z80 emulation core. You should have no problems
running vb81 v1.30 at full speed in both SLOW and
FAST modes even on a relatively low-spec Windows
- Improved performance
of both standard and hi-res display routines.
- Fixed a couple of
bugs in the keyboard support which caused many games
not to respond to key-presses.
- Added new 3x display
- New 'Allow writes to
shadow ROM area' option allows access to the 8K-16K
area of the memory map. Some games use this to
provide hi-resolution graphics and custom character
sets (FROGGER- for example).
- Fixed a bug in the
interrupt routine that caused FRAMES to be
incremented wrongly. Some games such as Rocket Man
froze after a few seconds or minutes of playing.
- Fixed some minor bugs
in the Z80 emulation. I believe the CPU emulation is
now 100% correct in terms of timing, flag operation,
and support for undocumented opcodes -- let me know
if you think otherwise!
- Playtested against
literally hundreds of ZX81 games to ensure full
compatiblity. The only known problem is ZX-Xtricator,
which has a custom overscanned hi-res display
routine that does not yet work properly with vb81.
Features in vb81
- Emulates both SLOW
and FAST modes.
- Emulates psuedo hi-res
graphics routines as used by innovative games such
as Forty Niner, Rock Crush, Dan's
Revenge, and Rocket Man.
- Supports loading and
saving of standard ".P" tape files used by
various other ZX81 emulators.
- Includes optimised 'standand'
and 'double-size' display options.
- Emulates undocumented
Z80 op codes, and correctly emulates all bits of the
- Native 32-bit Windows
application runs under Windows 95, Windows 98, NT,
- Emulates Memotech's
MemoCalc spreadsheet ROM.
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