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The Hegetron Hegotron Grafpad II is a graphic tabletfrom ''British Micro - A Hegotron Group Company'', marketed by ''Grafsales Ltd. '' It was produced for the Amstrad CPC, Joyce PCW and the IBM PC.

The Grafpad II is reviewed in [[Amstradbladet 1987, Issue 4|Amstradbladet 1987, Issue 4]], page 24 (Danish)   == Source Code == <pre> The following routines and descriptions are a part of FutureOS. All rights remain by Dr. Stefan W. Stumpferl. Free for non-commercial / private use. If you want to use this routines or parts of them, then give credits to TFM of FutureSoft! The original Hegotron software uses other port addresses and routines. This solution is faster and compatible to all other tested hardware expansions, which is not the case for the original routines from Hegotron. Version: 24.09.2010 - TFM of FutureSoft aka Dr. Stefan W. Stumpferl Questions? Mail me: FutureSoft@gmx.de  ;TEST IF HEGOTRON GRAFPAD 2 IS CONNECTED;;Parameters given back;;A = (&00 and) Z-Flag is set ---> no GP2 connected; = (&01-05,) Z-Flag cleared --> GP2 is connected;;Manipulated AF, BC T_GP2 LD A,&02:LD BC,&F9F7:OUT (C),A:LD C,&FF:OUT (C),C:LD C,&F7:IN A,(C):INC A:RET  TEST IF HEGOTRON GRAFPAD 2 IS CONNECTED======================================= Short description: Test if the Hegotron Grafpad 2 is connected. Jump in conditions: - Jump out conditions: The Z80 register A reports if the HegotronGrafpad 2 is connected to the CPC or not.A = &00 and zero flag is set ------> NO GP2 connected.A = &01-05 and zero flag cleared --> the GP2 IS connected. Manipulated: AF and BC. Description: This routine tests if the Grafpad 2 from Hegotron isconnected to the CPC. You call the routine without any parameters.After the return of T_GP2 the Z80 register A and the zero flag reportabout the existence of the Grafpad 2.If the routine returns with the value &00 in register A and with a setzero flag, then the Grafpad 2 can't be found. Else if the routinereturns with A unqual to &00 and with a cleared zero flag, then theGrafpad 2 is connected. Example:  CALL T_GP2;test if Grafpad 2 is connected. JR Z,NO_GP2 ;NO GP 2 connected! GP2 ... ;the GP2 IS connected!......   ;SCANNING OF THE HEGOTRON GRAFPAD 2;;Parameters given back;;DE = Y coordinate &0000-&04FF (&001B-&0484);HL = X coordinate &0000-&05FF (&0020-&05DF) + Buttons E (7.Bit H), S (6.Bit H);Bit 7/6(H) = 0 --> key pressed, Bit = 1 --> NO key pressed;;Manipulated AF, BC, DE, HL, BC' G_GP2 XOR A,A:LD BC,&F9F7:OUT (C),A ;OUT &F9F7,&00  EXX:LD BC,&F9FF:OUT (C),C:EXX ;OUT &F9FF,&FF  IN E,(C) ;yl=INP(&F9F7)  INC A:OUT (C),A:EXX:OUT (C),C:EXX:IN L,(C) ;xl INC A:OUT (C),A:EXX:OUT (C),C:EXX:IN D,(C) ;yh INC A:OUT (C),A:EXX:OUT (C),C:EXX:IN H,(C) ;xh RET  SCANNING OF THE HEGOTRON GRAFPAD 2================================== Short description: Scanning of the X-, the Y-coordinates and bothbuttons (E and S) of the Hegotron Grafpad 2. Jump in conditions: - Jump out conditions: The registers DE and HL report about the X- andthe Y-coordinates and the buttons E and S.DE = Y-coordinate, theoretical: &0000-&04FF, in real: &001B-&0484HL = X-coordinate, theoretical: &0000-&05FF, in real: &0020-&05DFAnd register H contains the state of the buttons E (bit 7, MSB of H)and S (bit 6 of H). For both buttons is valid, that a cleared bitreports a pressed key. If a bit is set, the key is NOT pressed. Manipulated: AF, BC, DE, HL and BC' Description: If the CPC is connected to the Hegotron Grafpad 2 (youMUST test this before!), then you can use this routine G_GP2 to scanthe actual coordinates of the graphic table pen and the status of thebuttons. When the routine returns DE contains the Y-coordinate of thepen. Theoretically that can be a value between &0000 and &04FF. But inreality the graphic tablet covers values between &001B and &0484.(There can be differences between different units). Little Y valuesare located at the bottom, near the user. Big Y values are locatedupwards, away from the user. The register HL reports about the Xcoordinate (bits 0-10) and the status of the buttons. The X coordinatetheoretical spans over values from &0000 up to &05FF. In reality thevalues lie between &0020 and &05DF. Little X values are located left,big X values are located right on the graphic tablet. Further the mostupper bits of register H (7 and 6) contain the status of both buttonsof the GP2. H encodes the buttons E (bit 7) and S (bit 6):- If bit 7 is cleared to 0, the key E (Entry, Exit) IS pressed now. If bit 7 is set to 1, the key E is actually NOT pressed.- If bit 6 is cleared to 0, the key S (Select) IS pressed now. If bit 6 is set to 1, the key S is actually NOT pressed. Example:  CALL G_GP2 ;get Grafpad 2 coordinates and buttons.  LD (GP2_X_Koordinate),DE ;save X-coordinate into RAM  LD A,H AND A,&C0 ;isolate bits 7 and 6 (= keys E and S), LD (KEYS_E_AND_S),A) ;and save key status (??00 0000) to RAM  RES 7,H RES 6,H LD (GP2_Y_Koordinate),HL ;save Y-coordinate into RAM... Attention: Use this routine ONLY if you are sure that the Grafpad 2 ISconnected to the CPC. Use T_GP2 to test this (look before).   ;SCANNING OF THE BUTTONS E AND S OF THE HEGOTRON GRAFPAD 2;;Parameters given back;;A (Bit 7) = button E / valid is...;A (Bit 6) = button S / Bit = 0 --> key pressed, Bit = 1 --> NO key pressed;;Manipulated AF, BC K_GP2 LD A,&03:LD BC,&F9F7:OUT (C),A:LD C,&FF:OUT (C),C:LD C,&F7:IN A,(C) ;yh  INC A:RET  SCANNING OF THE BUTTONS E AND S OF THE HEGOTRON GRAFPAD 2========================================================= Short description: Keys E and S of the Hegotron Grafpad 2 are scanned. Label: K_GP2 ROM-number: D Start address: &E73E Jump in conditions: - Jump out conditions: The register A reports if one of the two buttonsE (Entry, Exit) and / or S (Select) is pressed.Register A bit 7 corresponds to key E.Register A bit 6 corresponds to key S.A cleared bit (0) symbolizes a pressed key, whereas a set bit (1)symbolizes that the key is NOT pressed. Manipulated: AF and BC. Description: If the CPC is connected to the Hegotron Grafpad 2 (youmust test this before!), you can use this routine K_GP2 to investigatethe status of both keys.After the return of the routine the status of the keys is encoded inthe two upper bits of register A; key E (bit 7) and key S (bit 6): - If bit 7 is cleared to 0, the key E (Entry, Exit) IS pressed now. If bit 7 is set to 1, the key E is actually NOT pressed.- If bit 6 is cleared to 0, the key S (Select) IS pressed now. If bit 6 is set to 1, the key S is actually NOT pressed. Example:  CALL K_GP2 ;scan Grafpad 2 keys  AND A,&C0 ;isloate bits 7 and 6 (??00 0000) LD (KEYS_E_AND_S),A) ;and save status of keys to RAM ... Attention: Use this routine ONLY if you are sure that the Grafpad 2 ISconnected to the CPC. Use T_GP2 to test this (look before).</pre> == Manual == * [[Media:Grafpad 2 (Micro Draw) Manual.pdf|Grafpad 2 (Micro Draw) Manual]] {{EN}} {{PDF}} == Downloads == The System Software can be found here:  * [[Media:Grafpad2.dsk‎|DSK file, local mirror]]  

[[Category:HardwareFutureOS]] [[Category:Graphic]] [[Category:Input Device]] [[Category:Peripherals]] [[Category:StubManual]]