Epson PX-8 BIOS subroutines (OSRM, 4-2)

-03h BOOT       Performs a cold BOOT
 00h WBOOT      Performs a warm BOOT
 03h CONST      Returns the console input status.
 06h CONIN      Inputs one character to the console.
 09h CONOUT     Outputs one character to the console.
 0Ch LIST       Outputs one character to the LIST device.
 0Fh PUNCH      Outputs one character to the PUNCH device.
 12h READER     Inputs one character from the READER device.
 15h HOME       Positions the disk head to track 00.
 18h SELDSK     Specifies the device.
 1Bh SETTRK     Specifies the track for read or write.
 1Eh SETSEC     Specifies the sector for read or write.
 21h SETDMA     Specifies the DMA starting address for the read or write.
 24h READ       Reads the specified sector
 27h WRITE      Writes data to the specified sector.
 2Ah LISTST     Returns the status of the list device.
 2Dh SECTRN     Translates a logical sector to a physical sector.
 30h PSET       Converts graphic screen data for display.
 33h SCRNDUMP   Takes a hard copy of the displayed data.
 36h BEEP       Sounds the speaker.
 39h RSOPEN     Opens the RS-232C interface.
 3Ch RSCLOSE    Closes the RS-232C interface.
 3Fh RSINST     Informs whether the RS-232C interface has received data.
 42h RSOUTST    Checks whether the RS-232C is ready for transmission.
 45h RSIN       Receives one character from the RS-232C interface.
 48h RSOUT      Transfers one character to the RS-232C interface.
 4Bh TIMDAT     Performs clock or alarm functions.
 4Eh (MEMORY)   Does nothing.
 51h RSIOX      Performs RS-232C functions
 54h (LIGHTPEN) Does nothing.
 57h MASKI      Sets or resets the interrupt mask.
 5Ah LOADX      Reads the data in the specified bank.
 5Dh STORX      Writes data into the specified bank.
 60h LDIRX      Transfers data between banks.
 63h JUMPX      Jumps to the specified bank address.
 66h CALLX      Calls the subroutine at the specified bank address.
 69h GETPFK     Gets a PF key.
 6Ch PUTPFK     Defines a PF key.
 6Fh ADCVRT     Performs analog data input operation.
 72h SLAVE      Process communication with the SLAVE CPU 6301.
 75h RDVRAM     Read the contents of VRAM.
 78h MCMTX      Process communication with MIOS.
 7Bh POWEROFF   Turns main power off.
 7Eh USERBIOS   Entry point to the User BIOS.

Typical BIOS call:
        LD      IX, SLAVE
        LD      BC, (WBOOT)
        ADD     IX, BC
        JP      IX


Slave CPU Commands (OSRM 13-13)
1 RAM
  00 Read data
  01 Write data
  02 Execute routine
2 Screen
  10 - 36
3 Microcassette
  40-56
4 Serial I/O and serial communication
  60 Read serial I/O port status
  61 Set serial port bit rate
  62 Serial input
  63 Serial output
  64 Send with header (epsp-protocol)
  65 Receive data
5 ROM and speaker
  70 Turn on/off PROM capsule power
  71 Read PROM data
  72 Turn on/off speaker power
  73 Beep
  74 Melody


Source: PX-8 OSRM, p. 15-2

       Read                                 Write
00h   ICRL (Input Capture Register Low)    CTRL1 (Control Register 1)
01h   ICRH (Input Capture Regiser High)    CMDR (Command Register)
02h   ICRL.B (IRL Bar code Trigger)        CTRL2 (Control Register 2)
03h   ICRH.B (IRH Bar code Trigger)        
04h   ISR (Interrupt Status Register)      IER (Interrupt Enable Register)
05h   STR (Status Register) 7508 CPU               
06h   SIOR (Serial Data I/O Register)      SIOR (Serial I/O Register)

0Ch   8251 Data Read                       8251 Data Write
0Dh   8251 Status Read                     8251 Command Write
0Eh   SED 1320 PSR                         SED 1320 PDIR (6303 CPU)
0Fh   SED 1320 PDOR                        SED 1320 PDIR (6303 CPU)


80h - 81h    Intelligent RAM disk

84h - 87h    Direct modem

88h - 8Bh    Japanese-language processor

90h - 94h    Nonintelligent RAM disk

A0h - A7h   Synchronous communication unit