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  • Z88DK/SP1 library u_malloc() questionHi All, It may possibly be more appropriate for me to post this on the Z88DK forum, but I know quite a few WoSSers have used Z88DK, so here goes:- …

    ... reserve some space on the stack for the atexit() code (the C standard requires ... have already been taken on the stack. The thing to know is that ... the stack and once inside the function, the function's locals are created on the stack ...
    Alcoholics Anonymous Alcoholics Anonymous December 2010 Development
  • Z88DK/SP1 library u_malloc() questionHi All, It may possibly be more appropriate for me to post this on the Z88DK forum, but I know quite a few WoSSers have used Z88DK, so here goes:- …

    ... then noticed in the emulator debugger the stack was corrupting right ... the 257th byte of the IM2 vector table and the bottom extent of the stack ... .

    The code ... , rather than the bottom of the stack as before which ...
    Digital Prawn Digital Prawn December 2010 Development
  • 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…

    ... to call for the Screen$ command (and/or the ATTR command)? Any ... how well it works or the speed compared to a homemade ... me what's what in the ROM disassemblies I've read ... $ will store the value on the stack and you must get the value from ...
    Dr BEEP Dr BEEP January 2011 Development
  • yeah - unix for zx spectrumI started a new hobby project. An operating system for ZX Spectrum. A unix clone. Talked to my friend about it and he asked me what if after I'm done…

    ... condense allocations near the start of the heap which tends ... operand either in the exx set or on the stack. The 32-bit ... is what slowed the release of the entire stdio library because ... the internal kernel. The remaining part on the microdrive shall be the ...
    Alcoholics Anonymous Alcoholics Anonymous January 2011 Development
  • yeah - unix for zx spectrumI started a new hobby project. An operating system for ZX Spectrum. A unix clone. Talked to my friend about it and he asked me what if after I'm done…

    ... include data space, code and the stack. Starting up such a program ... switch (state is on the program's stack include initial register values ... collecting parameters from the stack. malloc jumps directly into the asm entrypoint in ...
    Alcoholics Anonymous Alcoholics Anonymous January 2011 Development
  • yeah - unix for zx spectrumI started a new hobby project. An operating system for ZX Spectrum. A unix clone. Talked to my friend about it and he asked me what if after I'm done…

    ... with planning to store the stack pointer on the stack, I'm sure you ... scheduling periodic tasks, much like the CPC firmware does. Programs altering ... , neither are those dependent on the R register.
    AndyC AndyC January 2011 Development
  • Gigascreen - programming guideDoes anyone know of a programming guide for the 128K gigascreen screen mode, specifically a persistence colours table, some code (pref. C level or BA…

    ... 128K Spectrum and using the extended memory and ... PUSH AF ;Store numbers on the stack...
    PUSH DE ;...as ... ;...
    POP AF ;...from the stack.

    INC DE ...
    ;Now flick between the two screens:
    flicker_loop
    joefish joefish February 2011 Development
  • All of Birminghams Citizens Advice Bureaux to close from 11th Feb.[url]http://www.gopetition.com/petition/42339.html[/url] [quote]Category: Neighborhood Living Region: United Kingdom Target: Birmingham City Council…

    ... perfect opportunity to change the country for the Tories the way they want ... day now the Chinese are top of the stack. Thanks to the American and ... some European countries industries paying the ...
    Modge Modge February 2011 Chit chat
  • DivIDE questionHi all, A while ago I was looking at programming firmware for the DivIDE and was told that, when writing an NMI function, address 0066h (the jump lo…

    ... , you have to have the remaining bits work with whatever ... will have been pushed onto the stack already, so you'll need ... />
    Since the instruction at 0x0066 in the DivIDE ROM will ... -byte instruction (caveat: unless the DivIDE actually uses this address ...
    Winston Winston February 2011 Development
  • Hard drive caddy for 1tb 2.5 inch disk drive.Silly me. I went and brought a 1tb 2.5 inch hard drive and a caddy. I brought the drive and the caddy saparately because I wanted a caddy with both E…

    ... +3 when I was prototyping the flash board is mostly broken ... photo of it.

    The stack of adaptors made it impossible ... to fit the lid but obviously I needed ... fitted snugly around the speccy case, and supported the "roof" about 2 ...
    guesser guesser March 2011 Chit chat
  • 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 …

    ... the stack to the data POP a value off the stack, change the stack pointer to the ... method is to point the stack pointer at the screen then do ... PUSH instructions (which has the added benefit of drawing to ... the screen from the bottom up and ...
    chev chev March 2011 Development
  • 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…

    ... 7 no-longer uses the stack or a loop. The code still comes ... ; the difference between the start of
    ; the channels area and the start of the ... /> ld e, l ; without using the stack
    add hl, hl ; multiply ...
    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 …

    [QUOTE=Ralf;522163]Hey, what is this supposed to do? :)[/QUOTE]
    It copies 20 bytes of stored graphics data at 49152 to the stack?
    FrankT FrankT 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 …

    Thanks for the explanation. So the only way using POP/PUSH ... is to use all the registers, giving a maximum of ... the value off the stack and decreased the SP. I guess the instruction to make the ... 've only ever drawn to the screen with HL pointing to ...
    FrankT FrankT 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 …

    ... Contour[/url]) might be the next holy grail of multicolour ... effects on the original 128K Speccy... as ... cell) and the attribute value changing in the following sequence:
    the line is taking the optimistic view, since the stack forces ...
    gasman gasman March 2011 Development
  • Welcome back Spectaculator!Hmm, I have to evaluate this again. It's the first emu I've tried that actually seems to boots the PlusD. Is there any way of speeding up the disc …

    ... Needle;522154]Not at the moment. The disk timing is emulated ... very carefully to replicate the behaviour of the real thing.
    ... But I want the snapshot at the point where the game has finished ... find simply by examining the stack in the debugger after a game ...
    dekh dekh March 2011 Emulators
  • Minor Update to Gasman's Midi2BEEPDon't know whether this is worthy an announcement, but for those of you who enjoyed Gasman's midi2BEEP utility, a new variant has been made called mi…

    ... written the data byte is POPed off the stack and sent to the 128 ... 's data port. The value ... .

    Since the write to the Timex is going to ... sent to the ULA. Such are the limitations of the design of the original ...
    chev chev April 2011 Announcements
  • 50Hurts - Full-screen 50Hz 1-pixel scrolling on a 128K Speccy50Hurts - Full-screen 50Hz 1-pixel horizontal scrolling on a 128K Speccy. Graphics are an obvious nod to Joffa, whose games and banter were a big ins…

    ... would presumably set the contents of the values to be ... writing one word into the code for every word ... would be fast, but the preparation time would be ... some code to shift the stack pointer mid-way along ... where you only re-write the screen edges each time). ...
    joefish joefish April 2011 Development
  • 50Hurts - Full-screen 50Hz 1-pixel scrolling on a 128K Speccy50Hurts - Full-screen 50Hz 1-pixel horizontal scrolling on a 128K Speccy. Graphics are an obvious nod to Joffa, whose games and banter were a big ins…

    ... a blank tile. So basically the entire background is redrawn each ... time.

    The code that actually draws the tile (or rather ... have been set up with the appropriate registers - so for ... the stack is used it re-draws from the right to the left of the ...
    dmsmith dmsmith April 2011 Development
  • 50Hurts - Full-screen 50Hz 1-pixel scrolling on a 128K Speccy50Hurts - Full-screen 50Hz 1-pixel horizontal scrolling on a 128K Speccy. Graphics are an obvious nod to Joffa, whose games and banter were a big ins…

    ... ; A contains the offset into the line address table< ... actually
    ; see the code chunk below
    ... do `JP loc_A1E5` as the last
    ; instruction ... /> ; we are using the stack for screen writes
    ...
    Ketmar Ketmar April 2011 Development
  • Zynaps: is it handcoded?sorry if this question was already answered. but i did some inspection of Zynaps code and it seems to me that it's screen drawing (and maybe other pa…

    I don't know the background to either of those, ... compiled code, though - I think the real indicator would be how ... probably see heavy use of the stack and index registers.
    gasman gasman April 2011 Development
  • Time difference for jumps and calls?Just interested (and possibly trying to distract myself from the more pressing problems in my sprite routine) and willing to risk a potentially daft …

    By the way, while we are talking ... just need to push the return address to the stack manually.

    Ralf Ralf April 2011 Development
  • Time difference for jumps and calls?Just interested (and possibly trying to distract myself from the more pressing problems in my sprite routine) and willing to risk a potentially daft …

    ... ]

    [B]End
    the rest of your program[/B ... from my head now. But the idea is to use [B ... [/B] as [B]JR[/B]. The stack will be set to some ...
    Ralf Ralf April 2011 Development
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Latest Posts

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