6502 Machine Code For Humans by Alan Tootill, David Barrow

By Alan Tootill, David Barrow

Laptop code is the language of the processor on the center of your machine approach. in contrast to many different books on computer code, this publication doesn't systematically clarify the operation of every guide in over the top aspect. in its place, it provides you with easy, comprehensible projects in computing which are performed by way of teams of directions (routines). every one activity is defined, the strategy defined, and enough documentation given so you might paintings during the exercises and spot the half performed via every one guideline.

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Extra resources for 6502 Machine Code For Humans

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The number of hundredths of a second delay is given in page zero location DELN and this can be set to 200 ($C8) whilst you determine the value needed, which is put in page zero location DELH, to cause the hundredth of a second delay. If you then set up code to execute INKD 30 times, to aim at a total delay of a minute, and start with DELH at 8, you can adjust this value as necessary to make the total delay as near to a minute as you can get. INKD - Timed delay while waiting for keyboard input Subroutines - GETCH to scan the keyhoard for input.

18 20 08 A6 A4 20 69 BO 88 DO CA DO FO E6 69 85 4C 35 10 hi 13 12 10 FF 08 hi F6 FI 06 05 00 10 10 hi There is another form of delay. The delay until any key on the keyboard is pressed. There is not much to this, except its usefulness. WAIT - Wait until a key is pressed Subroutines - GETCH. LenKth - 12. Stack - 2 + GETCH stack requirements. ReKisters chanKed - None. WAIT: WI: PHP PHA JSR ORA BEQ PLA PLP RTS GETCH #0 WI ;save the P and ;A registers. ;scan the keyboard. ;test the A register ;and go back if zero.

Store regs in pz. ;fix for binary arith. ;no of 1/100 second. ; 1/100 s delay factor. ;seek input making cy ;set if not 0 return. ;end early on input. ;else loop till 1/100 ;second is complete. ;Ioop till wanted no. ;of 1/100 sees done. ;exit with no input. ;set carry in TM PP ;to show input. Correct ;char code to KCH. ;return with pz regs. 18 20 08 A6 A4 20 69 BO 88 DO CA DO FO E6 69 85 4C 35 10 hi 13 12 10 FF 08 hi F6 FI 06 05 00 10 10 hi There is another form of delay. The delay until any key on the keyboard is pressed.

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