By Alan Tootill, David Barrow
Computer code is the language of the processor on the middle of your computing device procedure. not like many different books on computing device code, this publication doesn't systematically clarify the operation of every guideline in over the top element. as an alternative, it provides you with easy, comprehensible projects in computing which are conducted by means of teams of directions (routines). each one job is defined, the strategy defined, and enough documentation given that you should paintings throughout the exercises and notice the half performed by way of each one guideline.
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Additional resources for 6502 Machine Code For Humans
Registers changed - None. HOME: JSR lOX lOA HaMEL: OEX STA BNE JMP STTMP #6 #0 CCN,X HaMEL lOTMP ;store regs. in pz. ;count six bytes. ;clear A and use to ;clear 6 bytes from ;Iowest cursor ;variable. ;recover regs from pz. 20 A2 A9 CA 95 00 4C 10 hi 06 00 22 FB 10 hi To do away with the need to code a new setting of the current display area each time the screen limits are changed, provision is made for an area of RAM to be set aside to hold a number of sets of predefined display area parameters, anyone of which can be moved into the current display area by a common routine.
Restore A & P and ;jump to correct ;action via table. 08 48 08 A5 FO C9 BO C9 90 A9 C9 BO 20 02 OA 65 65 85 90 E6 68 28 6C II 23 7F IF 20 02 00 09 15 10 16 hi 04 02 02 02 03 02 00 Displaying Text 51 PSLNV: JPTBL: PLA PLP RTS JMP JMP JMP JMP JMP JMP JMP JMP JMP AUTOP HOME CFC CBC CFL CBL CR CRLF CLCDA ;restore A and P ;registers and ;retum no action. ;display character. ;home cursor. ;cursor fward I char. ;cursor back I char. ;cursor fward I line. ;cursor back I line. ;carriage return. ;car. ret.
The current cursor address is therefore the home address + the line byte displacement + the character byte displacement. The cursor is home when all the display information is at zero. Here is a little routine to home the cursor: HOME - Home cursor to line 0, character 0 Subroutines - STTMP, LDTMP. Stack - 3. Input - None. Output - All display information is set to zero. Registers changed - None. HOME: JSR lOX lOA HaMEL: OEX STA BNE JMP STTMP #6 #0 CCN,X HaMEL lOTMP ;store regs. in pz. ;count six bytes.
6502 Machine Code For Humans by Alan Tootill, David Barrow