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DP offset instructions, new demo programs.

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Added DPUP and DPDN, which take a one byte operand specifying how far up or down to offset the Data Pointer.
Three Fibonacci generators using the print.asm library.
 - 8 bit values printing in decimal representation.
- 16 bit values printing in hexadecimal representation.
- 32 bit values printing in hexadecimal representation.
This commit is contained in:
Anachronaut
2024-11-01 12:13:13 -04:00
committed by GitHub
parent e5241beb51
commit f4c78e68ba
7 changed files with 332 additions and 90 deletions
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Programs/Libraries/print.asm
+13 -8
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@@ -12,8 +12,13 @@ lineFeed:
OUTA 0x00 ; Output it.
RET ; Return to the caller.
; Expects A to contain the number of spaces to print.
blankSpace:
INIB 0x20 ; Set B to the ASCII value for space.
OUTB 0x00 ; Print it.
RET
; Expects A to contain the number of spaces to print.
blankSpaces:
INIB 0x20 ; Set B to the ASCII value for space.
OUTB 0x00 ; Print it.
BRA printDone ; If A is zero, we're done.
@@ -21,13 +26,13 @@ blankSpace:
BRI blankSpace ; Branch back to the loop again.
printString: ; Expects Data Pointer to be set to the beginning of the string to be printed.
LDA ; Move the first character of the string into A.
BRA printDone ; If A is NULL, the string is finished, so return.
OUTA 0x00 ; Output the character.
INCD ; Increment Data Pointer to the next character.
BRI printString ; Branch to the beginning of the loop.
printDone:
RET ; Return to the caller.
LDA ; Move the first character of the string into A.
BRA printDone ; If A is NULL, the string is finished, so return.
OUTA 0x00 ; Output the character.
INCD ; Increment Data Pointer to the next character.
BRI printString ; Branch to the beginning of the loop.
printDone:
RET ; Return to the caller.
; Expects A to contain the value to be printed in decimal form.
printByteDecimal: