software/assembly_fragments/ansi_escape.asm

# ASCII NUL
WORD_0

# ASCII 'G'
WORD_70
IM_1
ADD

# ASCII '1'
WORD_48
IM_1
ADD

# ASCII '['
WORD_90
IM_1
ADD

# ASCII ESC
WORD_26
IM_1
ADD

# ASCII 'K'
WORD_74
IM_1
ADD

# ASCII '2'
WORD_50

# ASCII '['
WORD_90
IM_1
ADD

# ASCII ESC
WORD_26
IM_1
ADD

# ASCII 'H'
WORD_72


# Print characters
printstring
    LDSP+0
    TEST
    BRZ>halt
        JSR>putchar
        JMP>printstring
halt
    TEST # Clean the null terminator off the stack.
    HALT

putchar
# Description:
#   Writes one character to the terminal.
# Stack Requirements:
#   Character to write
#   Return PC <-- TOS
    WORD_134217728      # XBUF
    WORD_134217732      # XCSR
    LDSP+3
    SWAP
putcharloop
    LDSP+0
    LOAD
    TEST
    BRZ>putcharloop
    TEST # Drop XCSR from stack
    SWAP
    STORE
    # Wrote the character. Clean up stack and return.
    STSP+0
    RTS