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<1…12131415161718…34>
  • Sprite adviceHello. So, I'm slowly getting to grips with Z80 assembly - currently equal parts frustration and enjoyment. Now looking for some advice to help shift…

    ... to be in the drawing routine:

    [code]
    spritedrawroutine ...
    [/code]

    the routine still works, but now draws ... sprite data takes up 4 bytes: l,h,e,d).
    routine from spritedraw down, it also ...
    48K 48K May 2006 Development
  • ANN: SP1 for Z88DK (aka splib3, Sprite Pack v3.0)Well it's finally arrived, after a month of "a few days from now" release deadlines. SP1 is the lastest version of splib, a flicker-free software sp…

    ... and Basic's interrupt service routine assumes it has a monopoly ... your own IM2 interrupt service routine.

    The pacman sprite ... occupies 4*8*2 = 64 bytes. The sprite graphics at the ...
    Alcoholics Anonymous Alcoholics Anonymous May 2006 Development
  • Extracting the Multiface ROM?Is there an easy way to save the contents of a real Multiface 128 ROM to tape, on a real spectrum, for the purposes of transferring it to PC for emul…

    ... />
    The routine copies the MF128 ROM (8192 bytes) from address 0 ...
    DEATH DEATH June 2006 Hardware
  • Checksum RoutinesHi there everybody, Does anyone have an 'off the shelf' assembler routine for generating checksums? Thanks Jim

    ... program and found the checksum routine at address $723B. The Z80 ... so only the first 64 bytes of the ROM are checked ... ensure that the first two bytes are always the same and ... unused 32-bit CRC checksum routine.
    Geoff Geoff July 2006 Development
  • Restore Registers Returning to BASICI should really know this, but I've not written code that requires a return to BASIC for a loooong time. What registers need to be preserved / resto…

    ... returning to a generic "loading" routine.

    I actually move ... pressed. Hehe. But the main routine is working so I can ... shave off a few more bytes here-and-there. Cheers for ...
    icabod icabod July 2006 Development
  • ZXLFN - storing tape header in a long file nameHi lads ;) Couple of months ago, the group of guys interested in divIDE software development has came up with an interesting idea - store tape heade…

    ... file itself is treated as bytes.
    [/QUOTE]

    Yep ... " should be treated as a bytes "seemingly-" with load base 49152 ... normal binary chunks is a routine which should be simplified to ...
    zilog zilog July 2006 Emulators
  • ZXLFN - storing tape header in a long file nameHi lads ;) Couple of months ago, the group of guys interested in divIDE software development has came up with an interesting idea - store tape heade…

    ... send that over as raw bytes?

    Edit:

    routine to ignore the checksum and the filetype bytes and ...
    Dunny Dunny July 2006 Emulators
  • Spectaculator QuestionsI've been messing around with this great emulator, and was surprised how easy it was for me to load a game from minidisc into Spectaculator as if it …

    ... the loading routine itself, restoring a few more vital bytes :)

    Marko Marko August 2006 Emulators
  • Spectaculator QuestionsI've been messing around with this great emulator, and was surprised how easy it was for me to load a game from minidisc into Spectaculator as if it …

    ... the loading routine itself, restoring a few more vital bytes :)
    Marko ...
    piters piters August 2006 Emulators
  • TAP conversion project?I was wondering if there's any concerted effort to produce TAP versions of games only available in TZX or Z80/SNA/SLT format? Or are snapshots consid…

    ... like the save routine wrapped around after $9500 bytes (when it ... = $00 and calls a routine at $830B. Trace into ... to assume that this routine is setting the current ... screen. It calls a routine at $8372 which you ... see is the loading routine if you trace into ...
    StuBruise StuBruise September 2006 Games
  • The Only Reason Sinclair Succeeded (Provoking Controversy)Although I love my Sinclairs dearly, I think that the only reason they succeeded was because at the time most people did not know any better (factori…

    ... strings or something other than bytes anyway. It forces you to ... be. A more complex sort routine (quick sort, comb sort) would ...
    JamesD JamesD September 2006 Sinclair Miscellaneous
  • The Only Reason Sinclair Succeeded (Provoking Controversy)Although I love my Sinclairs dearly, I think that the only reason they succeeded was because at the time most people did not know any better (factori…

    ... look at Kiwi's sort routine (from the same thread as ... e, 1 ; flag we swapped bytes
    push hl ; save current ... code.

    Even that routine could be optimized futher though ...
    Matt_B Matt_B September 2006 Sinclair Miscellaneous
  • +2 ramdisk - access in machine codeHow can you access the ramdisk in machine code? I've got a +2, and it seems the ramdisk has never been properly utilised. It would be a handy little…

    ... /> ; b'c'd' = length in bytes
    ; ehl = destination logical address ... $7ffd
    ; bcd = length in bytes (adjusted)

    ; e'h ... both in a general "movemem" routine since, for overlapping memory areas ...
    Alcoholics Anonymous Alcoholics Anonymous October 2006 Development
  • Currah MicrosourceHi Anyone here got a Currah Microsource ? I have one, its one of the original eval units complete with 'draft' manual. Just interested to see how …

    ... got a different set of bytes out before the program crashed ... to tape via a tape routine in uncontented memory.

    BloodBaz BloodBaz October 2006 Sinclair Miscellaneous
  • Floating point representationI'm planning on picking up the [url=http://matt.west.co.tt/category/spectrum/openzxrom/]OpenZXRom[/url] project from where I left off a few months ba…

    I would say for speed. By checking the value you would see two zero bytes, and then you know that the two following bytes hold the integer.

    See also the STACK-A Routine or STACK TO BC Routine
    Dr BEEP Dr BEEP October 2006 Development
  • How to save TZXGreetings to all. I am starting to move on from just games into some testing of home made programs. Although I could have done that in ancient tapes…

    ... on screen so that the bytes:qweqwe or program:qweqwe ... /> The best way around avoiding Bytes: from destroying your SCREEN$ (assuming ... your program in Machine Code (Bytes:) is to write a ... br /> call 1366 ; Run load routine in ROM
    jr nc ...
    BloodBaz BloodBaz October 2006 Emulators
  • Not so BRIGHTOk, on the Spectrum I'm a crayon man so I don't know much about the coding. If I create a graphic in, say, SevenUp or TommyGun and the graphic is not…

    ... routine to optimise considering we're only talking about 15-20 bytes ...
    rich_chandler rich_chandler October 2006 Development
  • Multiple loading screens[i]Action Biker[/i] suffers from having to endure multiple loading screens. Any other games that have this annoying "feature"?

    ... not. The ULA fetches two bytes to display each 8 pixels ... to fetch more than two bytes.[/QUOTE]
    That makes sense ... realise the complexity of the routine: I thought, like the static ...
    48K 48K October 2006 Games
  • The New SPIN releases ThreadOk, as I'm now working on SPIN again full-time, and as a very wise man once said, "Release Early, Release Often"[1]... I'm going to release new SPIN…

    ... for some, and entire bytes (or sequences of bytes) for others. If ... needs to refine the edge routine a little. I'll see ...
    Dunny Dunny November 2006 Emulators
  • Scrolling Loader CounterPlease can someone help me with writing a scrolling counter for a loading system. I like the Hewson counter so i`ve taken the font from zynaps loade…

    ... net, the loader routine is called LD_BYTES (or LD-BYTES ?, i don ...
    Fikee Fikee November 2006 Development
  • Rst #38This, as far as I know, is the ROM procedure that does the keyboard check. (and, at the same time, is what's being executed by interrupt in IM 1 mode…

    ... ,($5C7 ; Fetch the first two bytes at FRAMES1.
    INC HL ... ; Increment lowest two bytes of counter.
    LD ($5C7 ... DE ;

    CALL L02BF ; Routine KEYBOARD executes a stage in ...
    DEATH DEATH November 2006 Development
  • The BASIC ISRFirst of all, excuse me if my blatant ignorance about this topic makes me write some nonsense :) The thing is that I'm finishing a game in mixed BAS…

    ... where the vector table and routine are.
    Better, IMO ... $fe, then put the routine at $fefe. Less wastage ... DI before the first (setup) routine too.

    The ... tho', is having the routine in the top page, ... and jump are just 260 bytes (only to add the ...
    Dr BEEP Dr BEEP November 2006 Sinclair Basic
  • The BASIC ISRFirst of all, excuse me if my blatant ignorance about this topic makes me write some nonsense :) The thing is that I'm finishing a game in mixed BAS…

    ... table - this is 257 bytes of the same value. ... address of your interrupt routine... which is why in ... the address of your interrupt routine is at $fefe.
    ... table, and your interrupt routine, you then LD I, ... before running the setup routine. DI won't hurt ...
    icabod icabod November 2006 Sinclair Basic
  • Help understanding some z80 asmI'm trying to work out how to represent the structure of a "sprite" in the SAM as "Grabbed" by SmallC. I can see the assembler implementation but I …

    ... is the width in bytes, the next byte is ... in pixels, and the following bytes store the block,
    ... , including the a header bytes. Since the area is ... on the backdrop were 512 bytes each, I'd first ... using my existing software blit routine.

    Anyone ...
    DonkeyPong DonkeyPong January 2007 Development
  • Wanted: z80 asm routines...for the Sam. This call goes out to Colin and others who know how it should be done. If you look on the Sam C disk you can see the implementation…

    ... graphics as a chunk of bytes (width/2)*height. nothing more ... data is mixed into a routine specifically to print that sprite ...
    Quazar Quazar January 2007 Development
  • TZX revision 1.20 finalSince everybody seems to agree with the last propositions, the specification for the TZX file format revision 1.20 now becomes final and you can find…

    ... plus 26 lines of a routine used also in other blocks ... purpose routine.

    The bit about "access to the raw bytes ...
    Mikie Mikie January 2007 Emulators
  • TZX revision 1.20 finalSince everybody seems to agree with the last propositions, the specification for the TZX file format revision 1.20 now becomes final and you can find…

    ... all mean bypassing the loading routine and patching the datablock directly ... the fact that the saving routine splits the byte stream into ... (bits, bit triplets....)? The loading routine assembles the units back into bytes.
    Mikie Mikie January 2007 Emulators
  • TZX revision 1.20 finalSince everybody seems to agree with the last propositions, the specification for the TZX file format revision 1.20 now becomes final and you can find…

    ... all mean bypassing the loading routine and patching the datablock directly ... the fact that the saving routine splits the byte stream into ... triplets....)? The loading routine assembles the units back into bytes.[/QUOTE]
    Philip Kendall Philip Kendall January 2007 Emulators
  • TZX revision 1.20 finalSince everybody seems to agree with the last propositions, the specification for the TZX file format revision 1.20 now becomes final and you can find…

    ... exactly maps onto bytes as loaded by the loading routine.
    If ... be stored exactly as the bytes in tme memory before the ...
    Mikie Mikie January 2007 Emulators
  • TZX revision 1.20 finalSince everybody seems to agree with the last propositions, the specification for the TZX file format revision 1.20 now becomes final and you can find…

    ... storing them into memory, decrypts bytes and so on.
    In ... 0x19 and one single rendering routine could do for all.
    Luca Luca January 2007 Emulators
<1…12131415161718…34>

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