zxsp 0.7.3pre4
zxsp is a simulator for the historic Sinclair ZX home computer families. Main supported platform is Mac OS X. Versions for classic MacOS and old versions of Mac OS X are still available from the zxsp download page.
zxsp supports “.sna” and “.z80″ snapshot files, “.tap”, “.tzx”, “.pzx”, “.80″, “.81″, “.o”, “.p” tape files, excellent sound, precise screen and border effects, joysticks, mouse, a virtual tape recorder and virtual keyboards.
zxsp can load from and save to a built-in virtual tape recorder or a real-world cassette recorder or a real-world Specci. It also can dup real-world cassette tapes to “.tap” files or vice versa.
zxsp supports the black&white models ZX80 and ZX81 and the Jupiter Ace, the ZX Spectrum models with 16K and 48K ram, the +128, +2 and the +2A/+2B; including the Spanish and French versions. If you still own one of the emulated machines and find that the simulation does not match the original, you are welcome to contact me for further improvement. Just keep the original thing ready for tests. 
zxsp comes with a debugger with register edit for the main chips, a video beam position indicator, single stepper and memory disassembly. The machine can be throttled down to 1 Hz or overdrived to 20 MHz cpu clock. You can directly load Z80 assembler sources into zxsp.
What’s new:
Version 0.7.3pre5:
• Generic emulation of the b&w machines:
• Jupiter Ace: generic memory (3K), keyboard, audio and video decoding.?virtual taperecorder loads and saves .tap files.
• ZX81: generic memory (16K), keyboard, audio, and highres SLOW/FAST video decoding.?instant load/save works, virtual taperecorder load works, but not saving.
• ZX80: generic memory (4K), keyboard, audio, and highres video decoding.?instant load/save works, virtual taperecorder load works, but not saving.
• Frequent crash when switching between models fixed
• Inves Spectrum+ fixed and in again.
• This preview version is recommended for all who already loaded previous preview versions.
