VB81

Un emulateur ZX81 developpe en vb6. Une version amelioree existe, VB81 XUL

V 1.30
* 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.