BS-X BIOS Functions

All those documented BIOS functions are based from the SRAM Map; In case of an updated version, I'll put it with the original.

Function names are based on nocash's doc:

1059A4 init_port_2199_registers

  SRAM_1059A4:

  JML $80C36D //init_port_2199_registers
  //----

  init_port_2199_registers:
  
  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

1059A8 send_array_to_port_2199

  SRAM_1059A8:

  JML $80C399 //send_array_to_port_2199
  //----

  send_array_to_port_2199:
  LDY #$0000

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

1059AC recv_3x8bit_from_port_2199

  SRAM_1059AC:
  
  JML $80C3AF //recv_3x8bit_from_port_2199
  //----
  
  recv_3x8bit_from_port_2199:
  
  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

1059B0 send_16bit_to_port_2199

  SRAM_1059B0:

  JML $80C3D6 //to send_16bit_to_port_2199
  //----
  //16-bit data have to be in A, in 8-bit Mode.

  send_16bit_to_port_2199:

  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 

1059B4 recv_8bit_from_port_2199

  SRAM_1059B4:
  
  JML $80C403 //recv_8bit_from_port_2199
  //----
  
  recv_8bit_from_port_2199:
  
  LDY #$0008
  Loop:
  LDA #$81
  STA $2199
  LDA $2199
  ASL A
  XBA
  ROL A
  XBA
  LDA #$80
  STA $2199
  DEY
  BNE Loop
  XBA
  RTL