Routines
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ADB0: Print Counter Digit
Used by the routine at UpdateLightYears.
Prints one digit of the light years counter. The upper four bits of the byte hold the digit and the lower three bits are an animation step. The glyph is taken from the font that number of rows later than the start of the glyph, so that the digit scrolls up like an odometer as it changes.
Input
A Digit and animation step
HL Address in the screen buffer
Output
HL Address of the next character
Find the glyph and print it.
PrintCounterDigit ADB0 PUSH BC Stash the registers on the stack.
ADB1 PUSH DE
ADB2 PUSH HL
ADB3 LD L,A Copy the digit and step to L.
ADB4 SRL L Divide it by sixteen.
ADB6 SRL L
ADB8 SRL L
ADBA SRL L
ADBC LD H,$00 Set H to 00.
ADBE ADD HL,HL Multiply the digit by eight.
ADBF ADD HL,HL
ADC0 ADD HL,HL
ADC1 AND %00001111 Keep bits 0 to 3.
ADC3 CALL AddAToHL Call AddAToHL.
ADC6 JP PrintCharacter_Offset Jump to PrintCharacter_Offset.
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