mirror of
https://github.com/RevCurtisP/C02.git
synced 2024-11-17 15:06:29 +00:00
21 lines
681 B
Plaintext
21 lines
681 B
Plaintext
|
;Assembly Header Include File for platforms
|
||
|
|
;that do not have PRBYTE amnd PRHEX routines in ROM
|
||
|
|
|
||
|
|
;Print Byte as Two-Digit Hex Number to Console
|
||
|
|
PRBYTE: PHA ;Save Accumulater
|
||
|
|
LSR ;Shift Hi Nybble to Low Nybble
|
||
|
|
LSR
|
||
|
|
LSR
|
||
|
|
LSR
|
||
|
|
JSR PRHEX ; and Print it
|
||
|
|
PLA ;Restore Accumulator
|
||
|
|
; and fall into prhex
|
||
|
|
|
||
|
|
;Print Low Nybble as Hex Digit to Console
|
||
|
|
PRHEX: AND #$0F ;Strip High Nybble
|
||
|
|
CMP #$0A ;If Low Nybble >= 10
|
||
|
|
BCC PRHEXC ;
|
||
|
|
ADC #$06 ; Convert ':' to 'A'...
|
||
|
|
PRHEXC: ADC #$30 ;Convert to ASCII Character
|
||
|
|
JMP PUTCHR ;Print Hex Digit and Return
|