Assembler support - cfx 9850 G

This is schema of access points, whch I have created to enable asm on cfx.

How is machine code executed:

ROM in segment 2 contains table of jums, for every possible token one address, so I changed vector for token "#" from target routine "Syn ERROR" to "PRG START" access point at ROM seg 2:7FF8 , where is changed the segment to RAM. So on the address 7FFA in RAM MUST be instruction of jump to our code. The code should end jumping to 7FF8 where MUST be instruction of change segment to 2 (D1 22) - "EXIT" access point. It points to jump to the routine, which parses comments (token "'") - this solves skipping program arguments.

To read keyboard simply call address 7FF6 where MUST be "GETKEY" access point (instruction of change segment to 3 (D1 23)).

To update display after VIDEO RAM change simply call address 7FF3 where MUST be "DISPLAY" access point (instruction of change segment to 2 (D1 22)).

Return from these routines is done by changing segment to RAM at the address 7FF5, so there MUST be return part for "RET" access point (instruction for return (9F)).

Table of program interface - previous picture as a table

	ROM Seg2	ROM Seg3	RAM
7FF3	D1 Cseg	D1 Cseg	D1 Cseg
7FF4	40 RAM	40 RAM	22 ROM Seg2
7FF5	88 Jump	FF Nop	9F Ret
7FF6	FF <Update disp>	FF Nop	D1 Cseg
7FF7	05 <Update disp>	FF Nop	23 ROM Seg3
7FF8	D1 Cseg	8A Call	D1 Cseg - Jump here to exit your code
7FF9	40 RAM	D0 <Getkey>	22 ROM Seg2
7FFA	88 Jump	74 <Getkey>	88 Jump
7FFB	CC <Exit code>	88 Jump	<Hi addr of your  code starts>
7FFC	C0 <Exit code>	7F	<Lo addr of your code starts>
7FFD	FF Nop	F3	FF (Casio Basic - EOF)
7FFE	FF Nop	FF Nop	'#' (call routine in RAM - executing the file causes running this file as a machine code)
7FFF	FF Nop	FF Nop	?? - This byte is accessible only via backup send/receive

If you do not want to make your binaries yourself, you can use my compiler (assembler).

Unknown opcodes ? Read this.