BIOS_2199

//BS-X BIOS
//Disassembled $2199 serial related functions
org $80C36D

init_port_2199_registers: //$80C36D
PHB
PHK
PLB
LDA #$41
STA $2199
LDA #$00
XBA
LDA #$08
JSR $1059B0
LDX #$0000
Loop:
LDA _Array,x
XBA
TXA
JSL $1059B0
INX
CPX #$0007
BCC Loop
PLB
RTL

_Array:
db $88, $80, $04, $00, $08, $00, $70


send_array_to_port_2199: //$80C399
LDY #$0000
Loop:
LDA $0000,x
XBA
TXA
PHY
JSL $1059B0
PLY
INX
INY
CPY #$0007
BCC Loop
RTL


recv_3x8bit_from_port_2199: //$80C3AF
LDA #$01
STA $2199
LDA #$40
STA $2199
JSL $1059B4
STA $00,x
JSL $1059B4
STA $01,x
JSL $1059B4
STA $02,x
LDA #$01
STA $2199
LDA #$41
STA $2199
RTL


send_16bit_to_port_2199: //$80C3D6
LDY #$0008
Loop1:
PHA
AND #$80
STA $2199
ORA #$01
STA $2199
PLA
ASL A
DEY
BNE Loop1
XBA
LDY #$0008
Loop2:
PHA
AND #$80
STA $2199
ORA #$01
STA $2199
PLA
ASL A
DEY
BNE Loop2
LDA #$41
STA $2199
RTL


recv_8bit_from_port_2199: //$80C403
LDY #$0008
Loop:
LDA #$81
STA $2199
LDA $2199
ASL A
XBA
ROL A
XBA
LDA #$80
STA $2199
DEY
BNE Loop
XBA
RTL