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Jupiter Ace Emulators for Windows
We are lucky as there have been a few emulators over the years. Some are more useful than others, the odd one has features that none of the others have such as EightyOne with its WAV loader. Some have been abandoned for different reasons by their authors so development has stopped on some.
 
SpudACE
no$zx
EightyOne
Ace32xp & DOSBox
Vace
Vace 3d
MESS
Multi Machine
 
SpudACE
SpudACE
Is a new (2012) emulator written by Richard Chandler which will emulate the Jupiter ACE. Some features so far:
100% accurate Z80 emulation.
Drag and drop file loading.
File Formats supported .tap .wav .ace .txt
text file spooling
Accurate sound emulation.
Soft & hard rest.
Generate NMI
Save screenshot as a .bmp file
View modes 100%, 200% Full screen.
Tape browser
WAV browser
Snapshot save (.ACE)
Set screen colours white (Ace default), green or amber.
Folder locations for snapshots & taps (see Options > Folders)
Tools - SpudACE calculator
Save & Load configuration
Debugger
Keyboard help window (see Tools > display keyboard)
View Registers
View Memory
View Disassembly
load files from command line
PC logging

Keyboard layout & Keys:

Full Jupiter Ace keyboard emulated.
PC shift keys = Ace shift key (shift+8 = ( , shift+9 = ) shift+0 delete )
PC CNTRL keys = Ace symbol shift (cntrl+3 = # ,cntrl+z = : )
PC ESC will pause / restart.
PC F2 - will run SpudACE at full throttle (no sound) PC F3 - SpudACE debug tools
PC F4 - full screen mode, when in full screen F4 reverts back to normal window screen

New to version 0.320 MAY 2014
ADDED: Check the Edit ROM menu item to be able to edit the ROM.
ADDED: Onscreen keyboard.
ADDED: Added extra suffixes for Spool file loading ( .ja4, .fs)
FIXED: The Copy, Fill and Find function didn't actually work properly!!
FIXED: If you cancelled load WAV file in WAV browser SpudACE crashed.
FIXED: Load File didn't load .wav or .tap files.
REMOVED: OpenGL buttons in Options.
FIXED: SpudACE crashed when stereo sound was deselected. [Pegaz]
FIXED: Sound wasn't paused when doing UI related stuff. [Pegaz]
FIXED: Auto rewind & focus statuses weren't being saved when SpudACE was shut down. [Pegaz]
Fixed: SpudACE crashed when "Pause emulation when SpudACE when loses focus" was selected. [Pegaz]


Current version Download SpudACE 0.320

older versions (V0.314)  (V0.313)  (V0.312)  (V0.311)  (V0.310)  (V0.302)  (V0.301)  (V0.010)  (V0.008)  (V0.004)

SpudACE runs very well with Windows XP/Vista/7 & Linux with WINE installed.
SpudACE V0.312



SpudAce windows

spudACE-Linux
SpudACE running on Debian Linux 6.0 (Squeeze) with WINE
 
no$zx emulator
no$zx v2.0. The program has originally started as a two-weeks hack for emulating the ZX81, but now grew to a decent six-months project. Aside from improved ZX80/ZX81 emulation, it's now also supporting the Lambda and Jupiter ACE, alongsides with the complete ZX Spectrum series (though the older monochrome sinclair models are still looking more fascinating to me ..Martin Korth).



Download no$zx emulator V2.00 [other versions can be found no$zx website]
 
EightyOne
Is an emulator written by Mike Wynne which will emulate a number of simple machines including the ACE.
" It may or may not work on Windows 95/98/ME/NT4/2k/XP. I have no means of testing it except that it runs on my Windows XP laptop. It comes with no warranty, use it at your own risk. I think the "Simple ZX81 emulator" is a little outdated now - EightyOne is the most accurate ZX81 emulator available for Windows (And probably any other system too)" :- Mike Wynne.
EightyOne Version 1.00 runs fine with Windows 95/98/ME/NT4/2k/XP and now Vista compatible.
Download EightyOne V1.00 [Version 1.00 is used by the archive team]
Older Versions of Eightyone [V36] [V36b] [V42] [V42z] [V43a] [V43b] [V43c] [V52]
EightyOne V1.00 splash screen

EighytOne running on Windows XP with its Wav loader.
 
Ace32XP and DOSBox (version 0.74)
Ace 32 running under dos Box 0.74 and windows 7

See FAQ's for Ace32 and DOSBox installation.  
Vace
Vace version 1.0 was programmed for fun by Edward Patel. It has some loading and saving capabilities, but no snapshot function or sound.
Vace running Atic Raid on Windows XP
 
Vace 3D
Vace 3d , Yes!, a 3d version also programmed for fun by Edward Patel.
Vace 3d running on Windows XP
 
MESS
What is MESS?
MESS is an acronym that stands for Multiple Emulator Super System. MESS will more or less faithfully reproduce computer and console systems on a PC. MESS can currently emulate over 250 systems from the last 5 decades, including the Jupiter Ace.
MESS emulates the hardware of the systems and sometimes utilizes ROM images to load programs and games. Therefore, these systems are NOT simulations, but the actual emulations of the hardware.
MESS 098 running on Windows XP
 
Multi Machine
Multi Machine was programmed by Paul Hodgson. This emulator supports the Ace snapshot format.
Multi Machine running on Windows XP