Scans of adverts for ZX81 Software & Hardware Links to Various ZX81 Emulators Over 1000 P files to use with the emulators.Virtually every game/utility including classic's like 3d Monster Maze & ZX-Galaxians Pictures of the machine itself and various hardware

Scans of Tape Inlays Technical Specifications and circuit diagrams.
New Features 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 system
  • 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 magnification option.
  • 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.

Other 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 Flags register.
  • Native 32-bit Windows application runs under Windows 95, Windows 98, NT, and Win2K.
  • Emulates Memotech's MemoCalc spreadsheet ROM.



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