ZXDB single-step

[mrtinb]

On 2nd thought maybe I could add CALL $2000 (CD 00 20) in the code where I want a breakpoint. Then modify the registers acordingly to what the 3 instuctions would have done.

Then when I run the program, CALL $2000 will start ASDIS.

[mrtinb]

On 3rd thought. Running ASDIS will of cause mess up all registers. DOH

Unless ASDIS has a "clean" entry point that can be called.

[mrtinb]

Hi Siggi

Thanks for your help.

From: http://forum.tlienhard.com/phpBB3/viewt ... =483#p4114

Sieht also so aus, als wären auch Einsprünge bei 8195, 8198 und 8201 vorgesehen.

Did you ever find out what the other 3 entry points were used for?

[siggi]

On 3rd thought. Running ASDIS will of cause mess up all registers. DOH

Unless ASDIS has a "clean" entry point that can be called.

Hi Martin
the first problem, you wrote about, is to debug/single-step in ROM. Then you wrote about Forth: "The forth implementation I'm debugging"

ASDIS is a ZX81 program! So it expects to run together with a ZX81 rom (e.g. stores assembler source and configuration in a BASIC variable named A$).
Do you want to debug a Forth rom?
I always used ASDIS in a ZX81 context without problems. I don't know what happens, if ASDIS is running together with a Forth ROM!

Regards
Siggi

PS: No, I still do not know, what the 3 entry points are used for ...

[mrtinb]

I'm extending ToddyForth, and this is not in ROM.

Now I found that Hot-Z has both single-step debugger and breakpoints. I'll try that as well.

[siggi]

I think, that ANY debugger designed for ZX81 will only run in a standard memory layout like used by the ZX81 ROM and BASIC. But Forth uses its own layout (eg. expects text programs at 32768, but HOT-Z is running there). So I think you cannot use any of them.

But you could use EightyOne: run Forth there. And open the EO "debug" window, where you can set breakpoints and debug the program.

Siggi

[mrtinb]

But Forth uses its own layout (eg. expects text programs at 32768, but HOT-Z is running there).

I'm actually trying to modify ToddyForth, so it will run more like regular programs, and be easier to integrate with BASIC and ML.

Thanks for your help. Now I have 3 debuggers with single step functionality.

• ZXDB
• ASDIS
• Hot-Z