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Daniele Verducci su MatissePenguin
2021-02-15 21:23:12 +01:00
parent 706dbe56e1
commit d3604ca3ab
4 changed files with 43 additions and 27 deletions
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pat80-io-devices/composite-pal-adapter/software/avr-assembly/communication.asm
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@@ -9,7 +9,7 @@
; INTERNAL POINTER:
; Internally, the last screen position is represented by 24 bits in two registers:
; POS_COARSE: Register Y (16-bit, r31 and r30): Coarse position. Points to one of the chunks
; (character columns). 52 chunks per row, 304 rows. Used for character position, as
; (character columns). 46 chunks per row, 304 rows. Used for character position, as
; 1 chunk = 1 byte = 1 character.
; POS_FINE: Register r24: Fine position. Represents the bit inside the chunk selected by POS_COARSE.
; Ignored in character mode (the character is always aligned to column). Used in graphic mode.