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Kat
2019-05-25 20:23:01 -04:00
parent 4c85804f3e
commit 46b1681208
6 changed files with 72 additions and 5 deletions
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servicerequest.asm Normal file
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;================================================================================
; Service Request Support Code
;--------------------------------------------------------------------------------
; $7F5300 - $7F53FF - Multiworld Block
; $00 - $1F - RX Buffer
; $20 - $7E - Reserved
; $7F - RX Status
; $80 - $9F - TX Buffer
; $A0 - $FE - Reserved
; $FF - TX Status
!RX_BUFFER = "$7F5300"
!RX_STATUS = "$7F537F"
!RX_SEQUENCE = "$7EF4A0"
!TX_BUFFER = "$7F5380"
!TX_STATUS = "$7F53FF"
!TX_SEQUENCE = "$7EF4A0"
PollService:
LDA !RX_BASE : BNE + : RTL : + ; return if command is 0
LDA #$01 : STA !RX_STATUS ; mark busy
LDA !RX_BASE+1 : STA !RX_SEQUENCE ; mark this as handled
LDA !RX_BASE+2 : STA !RX_SEQUENCE+1
LDA #$00 : STA !RX_STATUS ; mark ready
RTL