ZXDEB alpha 3...
if you don't need an speccy debugger, then there's no need to download it :)
instructions to make it work:

1 - download the zxdeb zip source files (msvc), or only the exe
2 - decompress it anywhere
3 - find a 128k/plus2 rom, rename it to 128.rom and put it in the place you'll be executing the debugger. do the same with a 48 rom and rename it to spectrum.rom . roms are supplied with the exe-only version, however please note amstrad rom distribution license differs from this program's license
4 - download dlls (mfc & allegro dlls, maybe you won't need them)
5 - run!

debugger surely crash if the 128.rom or spectrum.rom are not present in the same directory. Consider that crash a chuntey error (to be fixed somewhere in the future).

once there, load a tap/snapshot, and start debugging ;)

Samples (wip)
Phantomas 2
The great escape

ZXDEB is built using a modified version of Aspectrum emulator as a base emulator.
AY chip sound is a preliminar version (noise channels are not ready yet, and other channels have some bugs)

Present features / keyboard shorcuts

• step into (F7)
• step though (F8)
• run (F9)
• run to (F4)
• go to (F11)
• run until (ctrl+F9) VERY SLOW! needs a lot of work yet
• screen go back to PC (backspace)
• breakpoint (F2 or doubleclick over instruction)
• set label (right mouse button / set menu)
• set indirect label (right mouse button / set menu)
• set comment (right mouse button / set menu), can be done by doubleclicking the rightmost part of the debugger text screen
• set comment BEFORE (not available)
• mark zone as defb/defw (not available)
• save emulator status (Shift + 1..5).
• load emulator status (Ctrl + 1..5). Status 0 contains the status from the start.
• disable labels ('-' key or view menu)
• memory viewer (Ctrl+m) (needs work)
• image viewer (Ctrl+i) ('screen' and linear modes)
• clear sound buffer (F12) USEFUL when you hear a repetitive sound just after you entered the debugger
• AY file creation (Ctrl+F12) (needs work and testing)
• View sound data (Alt+F12) (not available)
• Registers can be changed by clicking at them
• Memory can be changed by clicking at the memory viewer (and more than 1 byte can be altered)
• Labels can be edited by clicking at them
• Escape (in emulator window) - breaks into debugger

What's missing? Lots of things!!!!! The one I'm working at right now is a built in assembler, so that you can modify code while debugging. A variable watch, label managing, "before" comments (big comments to be put before functions), better implementation of lots of things, better sound (that work must be done in the emulator part), ... it's just an alpha, I plan to add lots of things :)

BTW, there's a nasty bug (I think it's a problem with allegro) which appears sometimes, were you can't switch back to emulator neither debugger, being the only way to exit just ctrl+alt+del to finish the process, so if you do something serious, you'd better save often :(
I hope the problem will disapear once I stop using the allegro window, soon...

Then execute (F9), type LOAD "" in the emulator and the debugger will stop at the GAME_START label (just after the game loaded).

contact: duelmc@SPAMYOURSELF.yahoo.co.uk or socelkak@SPAMYOURSELF.yahoo.co.uk