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This page last updated on 14th September 1997

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2 emulators listed:

[JASPER] [Spectrum Emulator for Java]

JASPER v1.1 (Andrew Pollard and Adam Davidson)

  1. Emulates 48K Spectrum.
  2. Loads .Z80 and .SNA files using PgUp or LOAD "snapshot name".
  3. Saves .Z80 and .SNA files using PgDn if you have downloaded the class archive.
  4. No real tape support.
  5. Runs on any Java system.
  6. Slow - Java is an interpreted language. On the PC at least, Internet Explorer v3.01+ has a good JIT (Just-In-Time) compiler and shows off this emulator better than Netscape can manage. V1.1 has been improved speedwise and has smaller class files so will download quicker.
  7. Freeware.
  8. Good points - well, it's a nice achievement and very portable but that's about it really!
  9. So slow... though hardly the author's fault.
  10. There is a downloadable class archive so snapshots can be saved and the emulator used without being online. Source also available.
  11. Available via author's home page or JASPER home page.

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Spectrum Emulator for Java (James Sutherland)

  1. Emulates 48K Spectrum.
  2. Loads .SNA files.
  3. Saves .SNA files.
  4. No real tape support.
  5. Requires a Java SDK (a web browser will not do!) such as Symantec's JIT 2.0, 8Mb RAM, and a 'fast' computer.
  6. Apparently almost full Spectrum speed on a P133 with 32Mb RAM running Symantec JIT 2.0 in Win95.
  7. Freeware.
  8. Frame skip and instruction store options (the latter stores emulated instructions to greatly improve performance when they are needed again, though this causes games with self-modifying code to fail). Includes a nice-looking debugger with breakpoints, single stepping, etc.
  9. Not runnable in a web browser's Java VM.
  10. No other comments.
  11. Available from Spectrum Emulator for Java home page.

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