Difference between revisions of "Programming the Microprocessor"

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  Select '''Language''' and then select the Letter '''A''' then select '''Assembly.'''  
 
  Select '''Language''' and then select the Letter '''A''' then select '''Assembly.'''  
 
  Assembly Language file uses the .s extension or .asm
 
  Assembly Language file uses the .s extension or .asm
−
  Select '''File''' again and then '''Save AS''' to the folder VASM6502 [enter a file name for your program]  
+
  Select '''File''' again and then '''Save AS''' to the folder VASM6502 [enter a file name '''updownblink.asm''']  
−
  Make sure it has the '''.asm''' extension (yourfilename.asm) then click '''Save'''.
+
  Make sure it has the '''.asm''' extension then click '''Save'''.
 
  Make sure you have line numbering turned '''On'''. Found under '''Settings/Preferences/Editing/Display line number'''.   
 
  Make sure you have line numbering turned '''On'''. Found under '''Settings/Preferences/Editing/Display line number'''.   
 
  Cut and paste the example code below into Notepad++ at line #1  
 
  Cut and paste the example code below into Notepad++ at line #1  
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'''Example code:'''
 
'''Example code:'''
−
      STX #$6ffc ; capture x reg
+
  .org $8000          ; Reset Vector points to the Program address on EEPROM
−
      LDX #$55    ; set counter to binary 10101010
+
reset:  ; reset = address $8000 on the EEPROM
−
count EQU *
+
  LDA #$FF          ; Set DDRB to output on 65c22
−
      LDA #$0f  ; Turn on half of the LED's 00001111
+
  STA $6002 ; write to VIA Address for DDRB
−
      STA $6000 ; Write value to VIA chip
+
loop: ; Main loop starts here
−
      DEX ; Decrease the X register by 1
+
  LDA #$55 ; Load Hex 55 alternating 0101 0101 Turn on evey other LED
−
      LDA #$f0  ; Turn on other half of the LED's 11110000
+
   STA $6000 ; Write to VIA $55 binary 01010101
−
      BNE count
+
  LDA #$00 ; Load $00 Binary 00000000 turn off LEDs
−
      LDX $6ffc ; Restore X reg to orginal value
+
  STA $6000 ; Write to VIA $00 binary 00000000
−
      LDA #$00   ; turn off all LED's 00000000
+
  LDA #$AA ; Load Hex AA alternating 1010 1010 Turn on evey other LED
−
      STA $6000  ; Write value to VIA chip
+
  STA $6000 ; Write to VIA $AA binary 10101010  
 +
  LDA #$00 ; Load $00 Binary 00000000 turn off LEDs
 +
  STA $6000 ; Write to VIA $00 binary 00000000
 +
  LDA #$55 ; Load Hex 55 alternating 0101 0101 Turn on evey other LED
 +
  STA $6000 ; Write to VIA $55 binary 01010101
 +
  LDA #$00 ; Load $00 Binary 00000000 turn off LEDs
 +
  STA $6000 ; Write to VIA $00 binary 00000000
 +
  LDA #$AA ; Load Hex AA alternating 1010 1010 Turn on evey other LED
 +
  STA $6000 ; Write to VIA $AA binary 10101010
 +
  LDA #$00 ; Load $00 Binary 00000000 turn off LEDs
 +
  STA $6000 ; Write to VIA $00 binary 00000000
 +
  LDA #$FF ; Load Hex FF all 1111 1111 to the A Register
 +
  STA $6000 ; Write to VIA $FF binary 11111111 to on all LED's
 +
  LDA #$00 ; Load $00 Binary 00000000 turn off LEDs
 +
  STA $6000 ; Write to VIA $00 binary 00000000
 +
  LDA #$FF ; Load Hex FF all 1111 1111 to the A Register
 +
  STA $6000 ; Write to VIA $FF binary 11111111 to on all LED's
 +
  LDA #$00 ; Load $00 Binary 00000000 turn off LEDs
 +
  STA $6000          ; Write to VIA $00 binary 00000000
 +
  LDA #$FF ; Load Hex FF all 1111 1111 to the A Register
 +
  STA $6000         ; Write to VIA $FF binary 11111111 to on all LED's
 +
  LDA #$00 ; Load $00 Binary 00000000 turn off LEDs
 +
  STA $6000 ; Write to VIA $00 binary 00000000
 +
  LDX #$00              ; Load the X register with $00 to start counting
 +
  countup: ; Start counting up from 0
 +
  INX ; increment the X register
 +
  TXA ; transfer X register to A register
 +
  STA $6000          ; Write that value to the VIA chip to turn on LEDS
 +
  BNE countup         ; Branch not equal if less than 256
 +
  LDA #$00 ; Load $00 to turn off all LED's
 +
  STA $6000         ; Write $00 to VIA to turn off LED's
 +
  LDX #$ff          ; Load X register with valus $FF to make sure in counts down correctly
 +
  countdown: ; Start loop for count down
 +
  DEX ; decrement the X register
 +
  TXA ; transfer X register to A register
 +
  STA $6000          ; Write that value to the VIA chip to turn on LEDS
 +
  BNE countdown        ; Branch not equal if not = 0
 +
  LDA #$00          ; Load $00 to turn off all LED's
 +
  STA $6000         ; Write $00 to VIA to turn off LED's
 +
  JMP loop ; Jump back to the start of the program
 +
  .org $fffc         ; Address of where to load or start the program
 +
  .word reset         ; reset = address $8000
 +
  .word $0000         ; write a word $0000 to fill in the the whole EEPROM
  
 
'''Compile your source code Windows 10.'''
 
'''Compile your source code Windows 10.'''
Line 31: Line 73:
 
  Open '''WIN''' folder then '''Win10''' folder and copy the relative path.
 
  Open '''WIN''' folder then '''Win10''' folder and copy the relative path.
 
  C:\Users\this-PC\Documents\VASM-6502\vasm6502_oldstyle\win\win10
 
  C:\Users\this-PC\Documents\VASM-6502\vasm6502_oldstyle\win\win10
−
  '''VASM6502 compiler''' is a command line program (CMD) so you need to use the CMD prompt terminal.
+
Move the file '''updownblink.asm''' you created with Notepad++ to the Win10 folder.
−
  Open CMD terminal and change directory to the VASM6502 directory.   
+
 
−
  CD Users\this-PC\Documents\VASM-6502\vasm6502_oldstyle\win\win10
+
  '''VASM6502 compiler''' is a command line program (CMD) so you need to use the CMD prompt terminal in Windows10.
 +
  Open CMD prompt terminal and change directory to the '''VASM6502''' directory.   
 +
  Example: CD Users\this-PC\Documents\VASM-6502\vasm6502_oldstyle\win\win10
 +
Do a list command to make sure your updownblink.asm file is in the folder.
 +
Type the following command: '''vasm6502_oldstyle.exe -Fbin -dotdir updownblink.asm'''
 +
Output creates the following lines and a file called '''a.out'''
 +
  ''vasm 1.8g (c) in 2002-2019 Volker Barthelmann
 +
  vasm 6502 cpu backend 0.8 (c) 2002,2006,2008-2012,2014-2018 Frank Wille
 +
  vasm oldstyle syntax module 0.13f (c) 2002-2018 Frank Wille
 +
  vasm binary output module 1.8a (c) 2002-2009,2013,2015,2017 Volker Barthelmann
 +
  seg8000(acrwx1):                106 bytes
 +
  segfffc(acrwx1):                  4 bytes''
 
    
 
    
 +
Rename the a.out file so that when you create a new program you do not lose this one.
 +
rename a.out updownblink.out
 +
'''Next Step:'''
 +
Write the updownblink.out to the EEPROM
 +
== [[ Programming the EEPROM ]]==
 +
----
  
−
 
+
== [[ 65C02 Vintage Computer Build ]] ==
  
 
----
 
----
−
 
+
==[[ Main Page ]]==
−
== [[ 65C02 Vintage Computer Build ]] ==
 

Latest revision as of 17:02, 7 June 2022

Write your source code. 

Download and Install Notepad++ from https://notepad-plus-plus.org/
Create a new folder (direcotry) Called VASM6502
Open Notepad++ and select File and then select New. (Opens a new window)
Select Language and then select the Letter A then select Assembly. 
Assembly Language file uses the .s extension or .asm
Select File again and then Save AS to the folder VASM6502 [enter a file name updownblink.asm] 
Make sure it has the .asm extension then click Save.
Make sure you have line numbering turned On. Found under Settings/Preferences/Editing/Display line number.  
Cut and paste the example code below into Notepad++ at line #1 
Select File again and then Save

Example code: 

  .org $8000  	        ; Reset Vector points to the Program address on EEPROM
reset:  		; reset = address $8000 on the EEPROM
  LDA #$FF  	        ; Set DDRB to output on 65c22 
  STA $6002		; write to VIA Address for DDRB
loop:			; Main loop starts here
  LDA #$55		; Load Hex 55 alternating 0101 0101 Turn on evey other LED
  STA $6000		; Write to VIA $55 binary 01010101
  LDA #$00		; Load $00 Binary 00000000 turn off LEDs
  STA $6000		; Write to VIA $00 binary 00000000
  LDA #$AA		; Load Hex AA alternating 1010 1010 Turn on evey other LED
  STA $6000		; Write to VIA $AA binary 10101010 
  LDA #$00		; Load $00 Binary 00000000 turn off LEDs
  STA $6000		; Write to VIA $00 binary 00000000
  LDA #$55		; Load Hex 55 alternating 0101 0101 Turn on evey other LED
  STA $6000		; Write to VIA $55 binary 01010101
  LDA #$00		; Load $00 Binary 00000000 turn off LEDs
  STA $6000		; Write to VIA $00 binary 00000000
  LDA #$AA		; Load Hex AA alternating 1010 1010 Turn on evey other LED
  STA $6000		; Write to VIA $AA binary 10101010 
  LDA #$00		; Load $00 Binary 00000000 turn off LEDs
  STA $6000		; Write to VIA $00 binary 00000000 
  LDA #$FF		; Load Hex FF all 1111 1111 to the A Register	
  STA $6000		; Write to VIA $FF binary 11111111 to on all LED's
  LDA #$00		; Load $00 Binary 00000000 turn off LEDs
  STA $6000		; Write to VIA $00 binary 00000000
  LDA #$FF		; Load Hex FF all 1111 1111 to the A Register
  STA $6000		; Write to VIA $FF binary 11111111 to on all LED's
  LDA #$00		; Load $00 Binary 00000000 turn off LEDs
  STA $6000  	        ; Write to VIA $00 binary 00000000
  LDA #$FF		; Load Hex FF all 1111 1111 to the A Register
  STA $6000 	        ; Write to VIA $FF binary 11111111 to on all LED's
  LDA #$00		; Load $00 Binary 00000000 turn off LEDs
  STA $6000		; Write to VIA $00 binary 00000000
  LDX #$00              ; Load the X register with $00 to start counting
countup:		; Start counting up from 0 
  INX			; increment the X register
  TXA			; transfer X register to A register 
  STA $6000   	        ; Write that value to the VIA chip to turn on LEDS 
  BNE countup	        ; Branch not equal if less than 256
  LDA #$00 		; Load $00 to turn off all LED's  
  STA $6000 	        ; Write $00 to VIA to turn off LED's 
  LDX #$ff   	        ; Load X register with valus $FF to make sure in counts down correctly 
countdown:		; Start loop for count down
  DEX			; decrement the X register
  TXA			; transfer X register to A register 
  STA $6000   	        ; Write that value to the VIA chip to turn on LEDS 
  BNE countdown         ; Branch not equal if not = 0
  LDA #$00   	        ; Load $00 to turn off all LED's 
  STA $6000 	        ; Write $00 to VIA to turn off LED's 
  JMP loop		; Jump back to the start of the program
  .org $fffc	        ; Address of where to load or start the program
  .word reset	        ; reset = address $8000
  .word $0000 	        ; write a word $0000 to fill in the the whole EEPROM

Compile your source code Windows 10. 

Download the application VASM from Dr. Volker Barthelmann´s Compiler Page: http://www.compilers.de/vasm.html
Select Binaries of vasm for 6502 for x86-64 (Mac, Windows and Linux): http://www.ibaug.de/vasm/vasm6502.zip
Move vasm6502.zip to your new folder VASM6502 and extract the zip file in that folder.
Open the new folder called vasm6502_oldstyle and select your operating system. I will be using Windows folder. (Win\Win10)
Open WIN folder then Win10 folder and copy the relative path.
C:\Users\this-PC\Documents\VASM-6502\vasm6502_oldstyle\win\win10
Move the file updownblink.asm you created with Notepad++ to the Win10 folder. 

VASM6502 compiler is a command line program (CMD) so you need to use the CMD prompt terminal in Windows10.
Open CMD prompt terminal and change directory to the VASM6502 directory.  
Example: CD Users\this-PC\Documents\VASM-6502\vasm6502_oldstyle\win\win10
Do a list command to make sure your updownblink.asm file is in the folder.
Type the following command: vasm6502_oldstyle.exe -Fbin -dotdir updownblink.asm

Output creates the following lines and a file called a.out 

 vasm 1.8g (c) in 2002-2019 Volker Barthelmann
 vasm 6502 cpu backend 0.8 (c) 2002,2006,2008-2012,2014-2018 Frank Wille
 vasm oldstyle syntax module 0.13f (c) 2002-2018 Frank Wille
 vasm binary output module 1.8a (c) 2002-2009,2013,2015,2017 Volker Barthelmann
 seg8000(acrwx1):                 106 bytes
 segfffc(acrwx1):                   4 bytes

Rename the a.out file so that when you create a new program you do not lose this one. 

rename a.out updownblink.out

Next Step: 

Write the updownblink.out to the EEPROM

Programming the EEPROM

65C02 Vintage Computer Build

Main Page

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