Gunfright: Routine at D4EA

D4EA: Convert Character

Used by the routines at PrintTelegram, TypeTelegram, PrintLargeText, HandleMenuBullet, PrintOutlawName and PrintText.

Converts a character into the number of its tile in Font. The space is 00, the digits are from 01 to 0A and the letters begin at 0B. A character which is not one of these gives a number which has other bits set.

Input
A	The character

Output
A	The number of the tile

Make a space into zero.

ConvertCharacter

D4EA

SUB $20

Take away 20, and keep it in C.

D4EC

LD C,A

D4ED

AND %00111111

Keep only bits 0-5.

D4EF

RET Z

Return if it is a space.

Make the digits begin at one.

D4F0

LD A,C

Take away 0F, and keep it in C.

D4F1

SUB $0F

D4F3

LD C,A

D4F4

AND %00111111

Keep only bits 0-5.

D4F6

CP $0B

Return if it is a digit.

D4F8

RET C

Make the letters begin at eleven.

D4F9

LD A,C

Take away 07.

D4FA

SUB $07

D4FC

RET

Return.