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Straight after this:


init movlw 0x04 ; divide XTAL OSC by 4 and then 32 for 4ms ticks
option ; later, load TMR0 with 256-140 and let overflow

Microchip's RISC asm was free last I got it.
That code should compile in the MPLAB development environment they provide for free.
It's not a language you want to jump into straight up, but to...

Of course.
You can probably get the chip as a free sample, build the project with an 18 pin (or whatever) IC socket,
and you have nothing to lose.

And again, add this to the source code you posted (after it's init label) :


movlw 0x07
movwf CMCON

Research and development is over! def works with 16F628/A.
Don't know how you're going to...