PROJECT : A TRS80 MC10 emulator on the ZX Spectrum

[Dr beep]

So I altered LD opcodes but not perfect.
I might get errors further in the game but I will try this first. C-flag is altered but other flags are now OK.

I can see that SOME OUTPUT gets to the screen so it is time to write the screenupdateroutine.

[Dr beep]

Another 1,5 hours spent to find 1 opcode emulated the wrong way.

[catmeows]

You are doing interesting things Dr.Beep. I like reading about it

[Dr beep]

Next bug is a wrong SP value.

[Quazar]

Because I did some emulation on the SAM too and a portal can be made???

I am just a fan of seeing an 8-bit machine emulate another, especially when there is a different CPU to be emulated as the programming and ingenuity behind the emulation engines to get best speed is very complex coding. So I applaud the work being done.

While I am chiefly focused on the SAM, I do still have my ZX Spectrums here... my 48K from 1983, +2 from 1986 and Next Dev Board from 2017.

Simon Owen used my mainprogram in his emulator on the SAM

I see there is a thanks to you for the fast opcode decoding techniques in the credits for his VIC-20 emulator. I have been patching that emulator to allow it to support some games as earlier this year I released an interface to plug VIC-20 cartridges into the SAM and run with the emulator.

[Dr beep]

Another opcode repaired and working but still my COPYRIGHT message is not set.
There still is a bug to solve.

[Dr beep]

I see there is a thanks to you for the fast opcode decoding techniques in the credits for his VIC-20 emulator. I have been patching that emulator to allow it to support some games as earlier this year I released an interface to plug VIC-20 cartridges into the SAM and run with the emulator.

Yeah I know he did.
Same routine is used here once again.

BTW on the SAM this emulator could be a bit faster since the original addresses can be read/written and the processor
is offcourse faster.

[NEO SPECTRUMAN]

BTW on the SAM this emulator could be a bit faster

Dr beep can you release completely lost SAM2_GB and SAM2_ZX81?
Binaries/sources
For historical/preservation purposes

[Dr beep]

Dr beep can you release completely lost SAM2_GB and SAM2_ZX81?
Binaries/sources
For historical/preservation purposes

no I can’t.

i don’t have the sources anymore.
it was on a computer that is long gone.
the source of the original ZX81EMUL for the ZX Spectrum is also only on paper printed in a map.
This I still have.

[Dr beep]

Dr beep can you release completely lost SAM2_GB and SAM2_ZX81?
Binaries/sources
For historical/preservation purposes

The source of my second ZX81 emulator, the one with hires on the ZX Spectrum, is also gone.
it was too slow so I never released it.

[Dr beep]

I did find this:

https://web.archive.org/web/20160324044 ... am2_gb.htm

[Dr beep]

Dr beep can you release completely lost SAM2_GB and SAM2_ZX81?
Binaries/sources
For historical/preservation purposes

SAM2_Zx81 is available here.
https://www.worldofsam.org/index.php/pr ... sam2zx81hr

[NEO SPECTRUMAN]

I did find this:

https://web.archive.org/web/20160324044 ... am2_gb.htm

i know about this link

also

but i can't find not scans nor pdfs of this magazine...
(Sam Revival magazine issue 19 Sept 2007)
https://www.worldofsam.org/products/sam ... l-issue-19


...so what about prebuild binaries?

[NEO SPECTRUMAN]

SAM2_Zx81 is available here.
https://www.worldofsam.org/index.php/pr ... sam2zx81hr

there is no binaries on this page in 2020 (also in 2022 to?)
only screenshot
also in 2020 it had be called SAM2_ZX81 without HR
https://web.archive.org/web/20221126123 ... s/sam2zx81

so is it has been finded recently?

[NEO SPECTRUMAN]

the one with hires on the ZX Spectrum, is also gone.
it was too slow so I never released it.

so what is this?
https://spectrumcomputing.co.uk/entry/3 ... /SP-2-ZX81
https://spectrumcomputing.co.uk/entry/1 ... 1-Emulator

[Dr beep]

so what is this?
https://spectrumcomputing.co.uk/entry/3 ... /SP-2-ZX81
https://spectrumcomputing.co.uk/entry/1 ... 1-Emulator

The 2020 and the 1997 emulator.
the 2006 emulator was coded to try hires for 25th anniversary, which was too slow on the Spectrum and then I tried the SAM2_zx81.

The source for the 1997 emulator I have in a map.

[Dr beep]

CLR A was emulated as LD A,0 but it also sets Z-flag so now it s XOR A

Other opcode was wrongly coded, some extra bytes without knowing where they came from.

COPYRIGHT message is printed, but still wrong text. Next step to find.

[Dr beep]

I have the (C) message. Todays target reached.

Next a screen display by intrupt.

[Dr beep]

Well there is a check for a number needed.... that is going wrong.

[Dr beep]

Well there is a check for a number needed.... that is going wrong.

It goes right, the MC10 alters the characterorder.

[Dr beep]

First attempt to let the emulator create a screen

[Dr beep]

Small bug found and border set black.

This is how the screen will be,

[Dr beep]

Oh... colour green might get bright too which is closer to the original.

[ANDREWRYALS]

I have the same feeling as I had in 1997 and 2000 when I coded my first ZX81 emulator and the VIdeopac emulator.

Same unknown outcome, knowing that speed will be an issue.

Either way, the best of luck, I know you'll code something amazing, you always do!

[Dr beep]

I am working on speeding up some opcodes.
I can erase some bytes when I can keep B' a fixed value. Every tstate won in the emulation is important.