zxsp 0.7.1

zxsp is a simulator for the historic ZX Spectrum home computer family. Main supported platform is Mac OS X. Versions for MacOS classic and Linux are available with different degree of feature set.
zxsp is a tool that supports ".sna" and ".z80" snapshot files, ".tap" tape files, excellent sound, precise screen and border effects, joysticks, 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 ZX Spectrum models with 16kB ram, 48kB ram, the +128, and the +2. 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 or you can use zasm for assembling. The built-in assembler is a spawn of zxsp, so you may want to look into the zasm documentation anyway.
Note: A version for classic MAC OS is also available.
Main features:
- Support for ZX Spectrum 16k through ZX Spectrum +2A
- Load .sna, .z80, .tap, .tzx, .rom, .ass and .scr files
- Save .sna, .z80, .tap, .rom and .scr files
- Excellent sound
- Precise screen and border effects
- Load from and save to real-world cassette recorder
- Virtual tape recorder and keyboards
- Joysticks
- Multiple instances
- Integrated debugger:
- Speed control from 1 Hz to 20 MHz
- Load assembler source files
- Z80, Ula/Mmu and AY-3-8912 register edit
- Single stepper
- Memory disassembly
- Breakpoints for exec, read or write access
- Video beam position indicator
Enhancements:
- Kempston mouse interface emulation.
- Saving ".z80" files in version 3.0 now. Defined IDs for all supported machines.
- Save ".80", ".o", ".81" and ".p" tape files for ZX80 and ZX81.
- Save and load ".z80" snapshots for ZX80 and ZX81.
- Save highres and flashing Gif screenshots. I create minimum common denominator gif files which all programs, incl. open source, freeware and Firefox should understand.
- Save highres Gif movies.
- Extended audio handler to work with physical devices with more channels.
- Fixed a very old bug (and, in OS 9 days, a dirty hack and not yet obviously a bug) in .z80 file compression.