89 lines
2.9 KiB
NASM
89 lines
2.9 KiB
NASM
;================================================================================
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; Service Request Support Code
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;--------------------------------------------------------------------------------
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; $7F5300 - $7F53FF - Multiworld Block
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; $00 - $5F - RX Buffer
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; $60 - $7E - Reserved
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; $7F - RX Status
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; $80 - $EF - TX Buffer
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; $E0 - $FE - Reserved
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; $FF - TX Status
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;--------------------------------------------------------------------------------
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; Status Codes
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; #$00 - Idle
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; #$01 - Ready to Read
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; #$FF - Busy
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;--------------------------------------------------------------------------------
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; Block Commands
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!SCM_WAIT = "#$00"
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!SCM_SEEN = "#$01"
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!SCM_GET = "#$02"
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!SCM_GIVE = "#$03"
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!SCM_PROMPT = "#$04"
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!SCM_AREACHG = "#$05"
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!SCM_DUNGEON = "#$06"
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!SCM_DEATH = "#$07"
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!SCM_SAVEQUIT = "#$08"
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!SCM_FCREATE = "#$09"
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!SCM_FLOAD = "#$0A"
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!SCM_FCDELETE = "#$0B"
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!SCM_SPAWN = "#$0C"
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!SCM_PAUSE = "#$0D"
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!SCM_STALL = "#$7E"
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!SCM_RESUME = "#$7F"
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; ;--------------------------------------------------------------------------------
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!RX_BUFFER = "$7F5300"
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!RX_STATUS = "$7F537F"
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!RX_SEQUENCE = "$7EF4A0"
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!TX_BUFFER = "$7F5380"
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!TX_STATUS = "$7F53FF"
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!TX_SEQUENCE = "$7EF4A0"
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;--------------------------------------------------------------------------------
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PollService:
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PHP
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SEP #$20 ; set 8-bit accumulator
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LDA !RX_STATUS : DEC : BEQ + : PLP : SEC : RTL : + ; return fail if there's nothing to read
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LDA #$FF : STA !RX_STATUS ; stop calls from recursing in
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LDA !RX_BUFFER : CMP.b !SCM_GIVE : BNE +
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PHY : LDA.l !RX_BUFFER+8 : TAY
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LDA.l !RX_BUFFER+9 : BNE ++
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JSL.l Link_ReceiveItem ; do something else
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PLY : BRA .done
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++
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JSL.l Link_ReceiveItem
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PLY : BRA .done
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+ : CMP.b !SCM_PROMPT : BNE +
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LDA.l !RX_BUFFER+8 : TAX
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LDA.l !RX_BUFFER+9 : STA $7E012E, X ; set sound effect, could possibly make this STA not-long
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REP #$30 ; set 16-bit accumulator and index registers
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LDA !RX_BUFFER+10 : TAX
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LDA !RX_BUFFER+12
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JSL.l DoToast
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SEP #$30 ; set 8-bit accumulator and index registers
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+
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.done
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LDA #$00 : STA !RX_STATUS ; release lock
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PLP
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CLC ; mark request as successful
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RTL
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;--------------------------------------------------------------------------------
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macro ServiceRequest(type)
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LDA !TX_STATUS : BEQ + : SEC : RTL : + ; return fail if we don't have the lock
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LDA $1B : STA !TX_BUFFER+8 ; indoor/outdoor
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LDA $A0 : STA !TX_BUFFER+9 ; roomid low
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LDA $A1 : STA !TX_BUFFER+10 ; roomid high
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LDA $76 : STA !TX_BUFFER+11 ; object index (type 2 only)
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LDA <type> : STA !TX_BUFFER ; item get
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LDA #$01 : STA !TX_STATUS ; mark ready for reading
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CLC ; mark request as successful
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RTL
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endmacro
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;--------------------------------------------------------------------------------
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ItemVisualServiceRequest:
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%ServiceRequest(!SCM_SEEN)
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;--------------------------------------------------------------------------------
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ItemGetServiceRequest:
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%ServiceRequest(!SCM_GET)
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;-------------------------------------------------------------------------------- |