BIOS Entry list

Comments:

Following restarts (from RST 0 до RST 28) are reserved for
BASIC-interpreter. RST 30 is reserved for interslot calls.
RST 38 handles hardware interrupts.

Name      Function Name
Function  Function Description
Entry     Arguments
Return    Result
Modifies  Modified Registers
Notes     Comments (optional)

------------------------------------------------------------

0000

Name            CHKRAM
F               Check RAM and sets slot for command area.
E               нет
R               нет
M               все
N               When done,a jump to INIT must be made for
                further initializator.


0008

Name            SYNCHR
F               Checks if then current character pointed by
                HL is one desired.If not,generates
                'Syntax error',otherwise falls into CHRGTB.
E               HL,character to be checked be placed at the
                next location to this RST.
R               HL points to next character,a has the
                character.
                Carry flag set if number, Z flag set if end
                of statesment.
M               AF,HL.


000C

Name            RDSLT
F               Select the appropriate slot according to the
                value given through registers, and reads the
                 contents of memory from the slots.
E               A:   FxxxSSPP
                     |   ||||
                     |   ||++--Primary slot #(0-3)
                     |   ++----Secondary slots #(0-3)
                     +---------If secondary slot # specified.
R               A: Contents of memory.
M               AF,BC,DE
N               Interrupts are disabled automatically but
                are never enabled by this routine.


0010

Name            CHRGTB
F               Gets next character (on token) from BASIC text.
E               HL
R               HL points to next characted, A has the
                character. Carry flag set if number,Z flag
                set if end of statesment encountered.
M               AF,HL.


0014

Name            WRTSLT
F               Select the appropriate slot according to the
                value given through registers, and writes to
                memory.
E               A: FxxxSSPP.(see RDSLT).
                HL: Address of target memory.
                E: Data to be written.
R               None.
M               AF,BC,D
N               (see RDSLT)


0018

Name            OUTDO
F               Output to the current device.
E               A,RTFIL,PRTPGL.
R               None.
M               None.


001C

Name            CALSLT
F               Performs inter-slot call to specified address.
E               IY -FxxxSSPP (high) (see RDSLT)
                IX: Adress to call
R               None
M               None
N               Interrupt are disabled automatically but
                never enabled to this routine. Argument can
                never be passed via the alternate registers of
                Z80 or IX and IY.


0020

Name            DCOMPR
F               Compare HL with DE.
E               HL,DE.
R               Flag.
M               AF.



0024

Name            ENASLT
F               Select the appropriate slot according to the
                value given through registers,and permanently
                enables the slot
E               A: FxxxSSPP.
                HL:Address of target memory.
R               None.
M               All.
N               (see RDSLT)



0028

Name            GETYPR
F               Return the type FAC.
E               FAC.
R               Flags.
M               AF.



0030

Name            CALLF
F               Performs far_call (i.e. inter-slots call)
E               None
R               Flags.
N               The calling sequence is as follows.


                RST 6
                DB              Destination slot.
                DW              Destination address.

                (see CALSLT)



0038

Name            KEYINT
F               Performs hardware interrupt procedures.
E               None.
R               None.
M               None.



;-----------------------------------------------------------

The following routined are used for I/O initialization.

;-----------------------------------------------------------



003B

Name            INITIO
F               Performed devise initialization.
E               None
R               None
M               All



003E

Name            INIFNK
F               Initializes function key strings.
E               None
R               None
M               All


;-----------------------------------------------------------

The following routined are used to access the VDP (T19918)

;-----------------------------------------------------------



0041

Name            DISSCR
F               Disables screen display.
E               None
R               None
M               AF,BC



0044

Name            ENASCR
F               Enables screen display.
E               None
R               None
M               AF,BC



0047

Name            WRTVDP
F               Writes to the VDP register.
E               Register in C,data in B.
M               AF,BC.



004A

Name            RDVRM
F               Reads the VRAM address by [HL].
E               HL.
R               A
M               AF



004D

Name            WRTVRM
F               Write to the VRAM address by [HL].
E               HL,A.
R               None
M               AF



0050

Name            SETRD
F               Sets up the VDP for read.
E               HL
R               None
M               AF



0053

Name            SETWRT
F               Sets up the VDP for write.
E               HL
R               None
M               AF



0056

Name            FILVRM
F               fill the vram with specified data
E               addres [HL] , length [BC], data [a]
R               none
M               All




0059

Name            LDIRMV
F               Moves a VRAM memory block to memory.
E               Address of sourse [HL], destanation [DE]
                lenght [BC] .
R               none
M               All



005C

Name            LDIRMV
F               Move blok of memery from memory to Vram
E               sourse [HL], destanation [DE], length [BC]
R               None
M               All



005F

Name            CHGMOD
F               Sets the VDP mode according to SCRMOD.
E               SCRMOD (0...3)
R               None
M               All



0062

Name            CHGCLR
F               Changes the color of the screen.
E               Foreground color in FOBCLR.
                Background color in BAKCLR.
                Border color in BDRCLR
R               None
M               All



0066

Name            NMI
F               Performs non-maskable interrupt procedures.
E               None
R               None
M               None



0069

Name            CLRSPR
F               Initializes all sprites.
                Patterns are set to nulls,sprite names are
                set to sprite plane number,sprite colors are
                set to foregroup color,vertical positions are
                set to 209
E               SCRMOD
R               None
M               All



006C

Name            INITXT
F               Initializes screen for text mode (40*24) and
                sets the VDP.
E               TXTNAM,TXTCGP.
R               None.
M               All



006F

Name            INIT32
F               Initializes screen for text mode (32*24) and
                sets the VDP.
E               T32NAM,T32GRP,T32COL,T32ATR,T32PAT.
R               None
M               All



0072

Name            INIGRP
F               Initializes screen for high-resolution mode
                and sets the VDP.
E               GRPNAM,GRPCGP,GRPCOL,GRATR,GRPPAT.
R               None
M               All



0075

Name            INIMLT
F               Initializes screen for multi-color mode and
                sets the VDP.
E               MLTNAM,MLTCGP,MLTCOL,MLTATR,MLTPAT.
R               None
M               All



0078

Name            SETTXT
F               Sets the VDP for text (40*24) mode.
E               TXTNAM,TXTCGT.
R               None
M               All



007B

Name            SETT32
F               Sets the VDP for text (32*24) mode.
E               T32NAM,T32CGT,T32COL,T32ATR,T32PAT.
R               None
M               All



007E

Name            SETGRP
F               Sets the VDP for high-resolution mode.
E               GRPNAM,GRPCGP,GRPCOL,GRPATR,GRPPAT.
R               None
M               All



0081

Name            SETMLT
F               Sets the VDP for multicolor mode.
E               MLTNAM,MLTCGRP,MLTCOL,MLTATR,MLTPAT.
R               None
M               All



0084

Name            CALPAT
F               Returns address of sprite pattern table.
E               Sprite ID in [Acc].
R               Address in [HL]
M               AF,DE,HL.



0087

Name            CALATR
F               Returns address of sprite atribute table.
E               Sprite ID in [Acc].
R               Address in [HL].
M               AF,DE,HL.



008A

Name            GSPSIZ
F               Returns the current sprite size.
E               None.
R               Sprite size(# of bytes) in [Acc].
                Carry set if 16*16 sprite is use,otherwise
                reset the otherwise.
M               AF



008D

Name            GRPPRT
F               Prints a character on the graphic screen.
E               Code to output in [Acc].
R               None
M               None


;-----------------------------------------------------------

The following routined are used to access the PSG.

;-----------------------------------------------------------

0090

Name            GICINI
F               Initializes PSG,and static data for PLAY
                statement.
E               None.
R               None.
M               All



0093

Name            WRTPSG
F               Writes data to the PSG register.
E               Register number in [Acc],data in [E].
R               None
M               None



0096

Name            RDPSG
F               Reads data from PSG register.
E               Register number in [Acc].
R               Data in [Acc].
M               None.



0099

Name            STRTMS
F               Checks/starts background tasks for PLAY.
E               None
R               None
M               All


;-----------------------------------------------------------

The following routined are used to access the console,
i.e. the keyboard and the CRT.

;-----------------------------------------------------------

009C

Name            CHSNS
F               Check the status of keyboard buffer.
E               None
R               Z flag reset if any character in buffer.
M               AF



009F

Name            CHGET
F               Waits for character being input and returns
                the character codes.
E               None.
R               Character code in [Acc].
M               AF



00A2

Name            CHPUT
F               Outputs a character to the console.
E               Character code to be output in [Acc].
R               None
M               None



00A5

Name            LPTOUT
F               Output a character to the line printer.
E               Character codes to the output in [Acc].
R               Carry flag set if aborted.
M               F



00A8

Name            LPTSTT
F               Check the line priter status.
E               None.
R               FF in [Acc] and Z flag reset if priter ready.
                0 and Z flag set if not.
M               AF.



00AB

Name            SNVCHR
F               Check graphic header byte and converts codes.
E               Character code in [Acc].
R               Cy flag reset: graphic header byte
                Cy and Z flags set converted graphic code.
                Cy flag set,Z flag reset,non-converted code.
M               AF.



00AE

Name            PINLIN
F               Accepts a line from console until a CR or STOP
                is typed,and stores the line in a buffer.
E               None
R               Address of buffer top-1 in [HL],carry flag
                sets if STOP is input.
M               All.



00B1

Name            INLIN
F               Same as PINLIN,exept if AUTFLO if set.
E               None
R               Address of buffer top-1 in [HL],carry flag
                set if STOP is input.
M               All



00B4

Name            QINLIN
F               Output a '?' mark and a space then falls into
                the INLIN routine.
E               None
R               Address of buffer top-1 in [HL],carry flag
                set if STOP is input.
M               All.



00B7

Name            BREAKX
F               Check the status of the Control-STOP key.
E               None
R               Carry flag set if being pressed.
M               AF
N               This routine is used to check Control-STOP
                when interrupt are disabled.



00BA

Name            ISCNTC
F               Check the status of the SHIFT-STOP key.
E               None
R               None
M               None



00BD

Name            CKCNTC
F               Same as ISCNTC,used by BASIC
E               None
R               None
M               None



00C0

Name            BEEP
F               Sounds the buffer
E               None
R               None
M               All



00C3

Name            CLS
F               Clear the screen.
E               None.
R               None.
M               AF,BC,DE.



00C6

Name            POSIT
F               Locate cursor at the specified position.
E               Column in [H],row in [L]
R               None
M               AF


00C9

Name            FNKSB
F               Check if function key display is active. If
                it is,it display it,otherwise does nothing.
E               FNKFLG
R               None
M               All



00CC

Name            ERAFNK
F               Erased the function key diplay.
E               None
R               None
M               All



00CF

Name            DSPFNK
F               Display the function key display.
E               None
R               None
M               All



00D2

Name            TOTEXT
F               Forcidly places the screen in text mode.
E               None
R               None
M               All



;-----------------------------------------------------------

The following routined are used for game I/O access.

;-----------------------------------------------------------


00D5

Name            GTSTCK
F               Return the current joystick status.
E               Joystick ID in [Acc]
R               Direction in [Acc]
M               All



00D8

Name            GTTRIG
F               Return the current trigger button status.
E               Trigger button in ID in [Acc].
R               Return 0 in [Acc] if not pressed,255
                otherwise.
M               AF



00DB

Name            GTPAD
F               Check the current touch PAD status.
E               ID in [Acc]
R               Value in [Acc]
M               All



00DE

Name            GTPDL
F               Return the value of the paddle.
E               Padle ID in [Acc].
R               Value in [Acc]
M               All


;-----------------------------------------------------------

The following routined are used to access the cassette tape.

;-----------------------------------------------------------


00E1

Na 3) A jump to 'Device I/O error' is made when
                    aborted.




0150

Name            GETVCP
F
E
R
M
N               Used only to play music in the background.



0153

Name            GETVC2
F
E
R
M
N               Used only to play music in barcground.



0156

Name            KILBUF
F               Clears the keyboard buffer.
E               None
R               None
M               HL



0159

Name            CALBAS
F               Performs far_call (i.e.inter-slot call) into
                the BASIC interpreter.
E               Address in [IX]
R
M



;-----------------------------------------------------------

The following is a a patch area for BIOS.It is placed here to
 make it easier to add new entry vector.