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  • Learning Assembly LanguageHow easy would it be to learn assembly language for someone who has a decent grasp of Basic? I mean how long do you think it would take before I coul…

    ... />

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


    ; Routine to wait for next video ... length
    ld d,0 ; Value to write to screen
    ld d,7 ; Value to write to attributes
    sekrets sekrets November 2010 Development
  • Learning Assembly LanguageHow easy would it be to learn assembly language for someone who has a decent grasp of Basic? I mean how long do you think it would take before I coul…

    ... />

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


    ; Routine to wait for next video ... length
    ld d,0 ; Value to write to screen
    ld d,7 ; Value to write to attributes
    ASM ASM November 2010 Development
  • Why doesn't my loop work?Can anyone help me understand why my loop doesn't work? Is it to do with how DEC HL affects the flags? [code] ; Read 32k bytes from port 191 as fa…

    ... HL,buf ; also overwrite trigger routine with sample data - why not ... :
    You could store the value read in another register (in ...
    RetroTechie RetroTechie December 2010 Development
  • New game coming soon: PhaetonI have thought that I'll announce it now to build some anticipation ;) I'm almost ready with my new Spectrum game called [B]Phaeton[/B]. It is a g…

    [QUOTE=Ralf;501215]I could do a Spectrum model detection at the start of the program and adjust my code appropriately, although I have no idea at the moment how to detect Pentagon[/QUOTE]

    Best way for detect Pentagon is test CPU speec (number ...
    velesoft velesoft December 2010 Games
  • A clever method of using a single 8-bit register to be used for two things at a timeI don't know if this is the way the SAVE routine in the Spectrum works. Anyway, this is what I've learned today. I've been commented the disassembly…

    ... many bits to process. This routine uses L with two roles ... process AND to have the value whose bits are being written ... another one to hold the value being written to the tape ...
    mcleod_ideafix mcleod_ideafix January 2011 Development
  • A clever method of using a single 8-bit register to be used for two things at a timeI don't know if this is the way the SAVE routine in the Spectrum works. Anyway, this is what I've learned today. I've been commented the disassembly…

    ... AND to have the value whose bits are being ... one to hold the value being written to the ... />
    In the decoder routine I analyze in my article ... current byte, preventing its value to become 0 until the ... the same as ROM load routine). The second marker bit, ...
    Metalbrain Metalbrain January 2011 Development
  • Converting TRD-Dos into TapHello, there are still many programs appearing on TRD-Dos or SCL format and users of normal Spectrum cannot run them. Of course I know about emulator…

    ... a typical TR-DOS load routine:

    [code]ld hl ... (data length in bytes = this value * 256),
    ;C = operation code ...
    Hikaru Hikaru January 2011 Development
  • FRAMES counter...Hi Folks, I wrote a test program that uses FRAMES to generate a clock. When I tested this within BASin it worked well and kept near perfect time. …

    ... by the BASIC Interrupt Service Routine, which runs 50 times a ... FRAMES counter being updated (any routine with a DI), for example ... you need to read the value of these three bytes twice ... succession and take the high value for full accuracy because of ...
    na_th_an na_th_an January 2011 Sinclair Basic
  • Screen$ command, ROM routineHi All, Does anyone know which ROM routine to call for the Screen$ command (and/or the ATTR command)? Any comments on how well it works or the spee…

    ... /> Does anyone know which ROM routine to call for the Screen ... />
    SCREEN$ will store the value on the stack and you ... must get the value from it.

    I ...
    Dr BEEP Dr BEEP January 2011 Development
  • Converting TRD-Dos into TapHello, there are still many programs appearing on TRD-Dos or SCL format and users of normal Spectrum cannot run them. Of course I know about emulator…

    ... $3D13 (the TR-DOS loader routine) and making a note of ... 's post explains what the value of each register means)
    routine, which loads the data from ...
    * Dump the entire loader routine to disk using the emulator ...
    StuBruise StuBruise January 2011 Development
  • Z80 Processor Interupt helpHi everyone, Currently designing a Z80 computer and i need a little help with these interupts. If i have an I/O device that sends a pulse to the int…

    ... the data bus. The value of this byte and the ... current value of I register will ... form a 16 bit value, which will be handled ... of another 16 bit value. That value will be read and ... address will be performed (interrupt routine).

    For ...
    mcleod_ideafix mcleod_ideafix January 2011 Hardware
  • guides and tips on converting multi loaders to diskhi all is their any sites with info about converting the various multi loading tape games over to disk using plus d interface? any pointers or info w…

    ... with your own disk loader routine using +D hooks. And do ... simply put the current R value in it...

    With ...
    Stefan Drissen Stefan Drissen January 2011 Games
  • Calculating the address of a pixel?Hi Folks, Is there an easy/quick way of calculating the memory address of a pixel? So for example, if I wanted to "plot" pixel at screen coordinate…

    ... of 320x224 with 8x8 attribute cells (yes, i know it's ... 'd need a sixteen bit value (well, nine bit, but you ...
    ewgf ewgf February 2011 Sinclair Basic
  • Calculating the address of a pixel?Hi Folks, Is there an easy/quick way of calculating the memory address of a pixel? So for example, if I wanted to "plot" pixel at screen coordinate…

    ... layout, in terms of logic cells used, is needed.

    cells) in the ULA" because that ... coordinate storage, a 16-bit value can hold both X,Y ...
    mcleod_ideafix mcleod_ideafix February 2011 Sinclair Basic
  • Calculating the address of a pixel?Hi Folks, Is there an easy/quick way of calculating the memory address of a pixel? So for example, if I wanted to "plot" pixel at screen coordinate…

    ... check in the each gfx routine he writes; and it forces ... coordinate storage, a 16-bit value can hold both X,Y ...
    TVzombie TVzombie February 2011 Sinclair Basic
  • Calculating the address of a pixel?Hi Folks, Is there an easy/quick way of calculating the memory address of a pixel? So for example, if I wanted to "plot" pixel at screen coordinate…

    ... layout, in terms of logic cells used, is needed.

    cells) in the ULA" because that ... coordinate storage, a 16-bit value can hold both X,Y ...
    Paddy Coleman Paddy Coleman February 2011 Sinclair Basic
  • Ocean Conquerer 48kDoes anyone play this game? The instructions say Determine your rank and set your level of difficulty and joy stick preference. But when I load the g…

    ... POKE the S-channel output routine address with 52h, which contains ... later restored to its original value, but in the TZX it ... doesn't restore the value so the S-channel output ...
    Battle Bunny Battle Bunny February 2011 Games
  • Utility or routine to save/display imagesLet's assume I have an image or sprite at coordinates x,y with w witdh and h height. If I were to store this image, which storage method would allow …

    ... an utility or any available routine that would allow me to ... also have a machine code routine which can turn an are ... don't need the entire value of the screenaddress.
    Dr BEEP Dr BEEP March 2011 Sinclair Miscellaneous
  • Is this the infamous Dead CockroachCan anyone help me. I have an issue two spectrum that I want to list on ebay, but I want to know if this has the dead cockroach ULA fix. I would have…

    ... the keyboard only in interrupt routine, when no display data are ... the memory lines to particular value whenever an IO instruction is ...
    Patrik Rak Patrik Rak March 2011 Hardware
  • RFC: 64 column font codeIn BASIC, type CLEAR 49999 then import the code at 50000. Then type RANDOMIZE USR 50000. This will create a new channel and attach stream #4 to it. A…

    ... 0x1655 ; call the MAKE-ROOM routine
    inc hl ; move HL ... bc, 0x15c4 ; address of input routine
    ld (hl), c ; low ... character
    ld a, (atflg) ; value of AT flag
    and ... holds the offset to the routine

    pop af ; restore ...
    chev chev March 2011 Development
  • Push/Pop data copyingWe all know that stack pointer cheese and push/pop is faster to move data than LDIR - which in turn is slower than unrolled LDI's anyway. I rewrote …

    ... limit for an 8x1 attribute routine on an original Spectrum. I ... 36x192 4x1 cells or 32x192 8x1 cells or 64x96 4x2 cells, with ink ...
    Patrik Rak Patrik Rak March 2011 Development
  • SE Basic Type-ins^Pete suggested creating a sticky thread for SE Basic discussion. I thought a Type-ins thread might also be useful. Up to the mods if they want to ma…

    ... "). Also, unlike the old routine, this one includes character masking ... call make_room ; call the MAKE_ROOM routine
    inc hl ; move ... push hl ; And another useful routine - it calculates the
    ...
    rrc a ; value of ATTR_P (the permanent PAPER ...
    chev chev April 2011 Sinclair Basic
  • Assembly help: EQUCan anyone explain in duffers language the purpose of the EQU term in assembly? I found this info in another thread: EQU: Equate a name to a specif…

    ... . It's just like the value of an EQU statement, but ... side as a callable sub-routine. You could even have a ...
    joefish joefish April 2011 Development
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