PROJECT : A TRS80 MC10 emulator on the ZX Spectrum

[Dr beep]

Reading the keyboard is not ready, not all tokens are defined yet but I just ran my firt program

1 PRINT 123;
2 GOTO 1

[Dr beep]

The MC10 has 48 keys that are read unshifted.
The ZX Spectrum has 40 keys that are read unshifted.

This means that to read the 8 extra keys on the ZX Spectrum 2 keys need to be pressed.
All the keys (except BREAK) can be read with symbol shift + key, however...
The MC10 also uses a symbolshift key and other keys to make keywords.
Keywords can also be typed as lose letters so for some keywords the
keyboardroutine will read the ZX Spectrum character and you need to type the keyword
for that key letter by letter.

I am now working on the routine to skip ZX Spectrum character from the MC10 keywords.

[Dr beep]

The first keyword showed up after fixing another opcode.
Next to do add other values for keywords in a table to make keys react to them.

The table is already part of the code, but keys were disabled.

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It took me a while to know how the MC10 defined the keys.
Especially the ZX Spectrum keys under symbol shift that are default on the MC10.

I finally have the keywordroutine working, now only changing a table to get all keywords.

[Dr beep]

Adding the SHIFTED keys was yet another struggle but it is now working too.

Only a few keys still missing to add.
+<>?*=

and a BREAK-key test

After that the keyboard is ready and I can try focussing on speeding up the emulator

[Dr beep]

Adding the final keys did not work as planned.

So I focused on the keyboardroutine that was still doing a check where from ROM it was called.
Still some ghostkeys appeared once in a while.

i was able to stabilize the routine and make it independent from where it was called.
Now ingame keyboardredading should always work too.

next to add the extra keys.

[Dr beep]

From tuesday till now (sunday) struggling to get 1 extra key to the keyboard.
When 1 will work all will work.

Now finally working and found out that there is a different bug eleswehere.

[Dr beep]

I coded a program to display all characters.
This would show all option of the screenroutine too.

I ran this code
1 FOR F=1TO255
2 PRINT CHR$(F);
3 NEXT F

It showed another bug, CHR$ is executed as CODE, so work to find the error.

[Dr beep]

I also ran the code at 20 Mhz on an emulator.

This is a good speed the emulator runs at

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Bug found and this is the output of the code.

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BREAK key was the only TRS80 key missing, now all keys added.

Only an extra key for the menu needed.

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Final issue with the keyboard was some keys added an extra ghost key.
I was able to find a fixed moment where it happened so I was able to
find the cause.

I will now start adding the menu and speedup the BASIC

A BETA version could be released if wanted......

[Quazar]

A BETA version could be released if wanted......

Would be great to see!

[Dr beep]

I will make it... btw with Mayhem you can get a good speed already.

I will add option back 2 basic first

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A beta version......

https://www.mediafire.com/file/4wxet0zh ... a.zip/file

[Dr beep]

Another opcode fixed, but not in the beta version.

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First results of a tester shows some missing features due to lack of knowledge.

Working on that.

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Added a menu and now working on the display of the MC10 keyboard as emulated on the ZX Spectrum.

After that I will work on the sound and loading.

Finally I will speed up the BASIC by translating parts of the ROM.

[Dr beep]

The keyboard picture is now added.

Loading next

[zx_if1]

Ok
I downloaded the beta
and the pdf manual too
now I go to try it
thanks
then I will write my observations next

[zx_if1]

Ok
cest magnifique!
set and reset work good
the bad: print@ and sound crashed the emulator
all freezed
mem crash all too

[Dr beep]

print@ is solved, sound is known too, but soynd was not added yet.

[Dr beep]

Although not exact the same sound as on the MC10, the emulator has sound.

[zx_if1]

ok
but INPUT is not accepted yet
caused error
and MEM crashed all

[Dr beep]

Input and mem had the same bug as print@

Wait for new release.