Ok, then it is the first answer. I used a Dremel steel point with a conic shape the point that size. Then you only have to  tilt the Dremel and drag and dig the track like writing. The 7134 in this picture:

I've made some test with the  interface. The various versions of Mouse.xr all load and install. The driver is visible with :help. on the other side Paintbox hangs at loading...

I've tried then with the basic program inside the instruction booklet, but it stops when intents to open the mouse channel. "Device not found" or something similar.

The original schematics have been followed except for the switches, they seem to be swapped in the table.(RTS needs sw2 be ON and sw1 OFF)

If I disconnect the RTS jack and put a joystick in the D-SUB port it works fine( for example: 10 print joy(1):  20 goto 10), the four directions and fire.

And about the mouse, they(Neos instructions) say it has a joystick mode when you power on with the left button pressed. Mine not, it only returns 16 with fire and 1 or 2 with the directions movements when in that state.

I think, may be the two modes(mouse, joystick) are interchanged, as if the normal mode(without pressing left switch at the start up)  could be the joystick mode.

I will test this and the PS/2 adapter at night.

I have loaded almost all, including Hsoft and the version coming with EGI.

RTS output is working. The error was on the short piece of wire, regained from a broken power suply... Now I know it was what was broken...

More tests this night.

The modified switch(normally open) of the jack 3.5 base was the offender....

Now it works.....but only with the 3352 bytes version of mouse.xr(I'm loading them with EPTE, so could exist some error with the tape files). The Neos mouse has some fault and only throws horizontal coordinates(?). But it is smooooooth....

On the other side the PS/2 to MSX converter works like a charm. The two PS/2 mouses tested have a high dpi and so are excessively fast, but I can manage them.


I have used this little program for the test:

100 GRAPHICS
110 SET 180,101
120 SET 181,30
130 SET 182,1
140 SET 183,255
150 OPEN £1:"mouse:"

MOUSE.XR versions:
2842 bytes: come with Paintbox 1.0, inside the file MOUSE version 1.0, but don't see in the HELP list. It is only works with NEOS mouse. If no Mouse then the cursor going to right bottom corner

3352 bytes: also MOUSE version 1.0 and displayed in the HELP list
It is have the 189 EXOS variable which used for select the input device: 0 Internal Joy, 1 Ext1 Joy, 2 Ext2 Joy, 3 Neos Mouse. Under the paintbox the selection works with F keys.
Then this version also works with joystick and mouse, but I can't press fire

3178 bytes: same with the previous, but fire working

3196 bytes: lates find from Nick disks. MOUSE version 1.1, joysticks and NEOS mouse also working.

3072 bytes: come with the Hungarian release of the Paintbox, NEOS support removed, only works with joystick

3389 bytes: HSOFT modified the previous version, added support for Gyula Mészaros serial interface card with Mouse System serial PC mouse. (And no NEOS)

The Neos mouse always returned 1 or 2 on joystick mode too, left and right, so something in the vertical decoder is wrong.

As I don't see one evident fail in its electronics I´ve bought another one on Ebay. 

Patience, only a couple of weeks.