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  • Byte-order backbufferThis is a tool for Z80 coders who wish the Spectrum screen had a serial layout. It runs as an interrupt mode 2 service routine and uses POP and PUSH …

    ... ]This is a tool for Z80 coders who wish the Spectrum ... , 0x3b ; high byte of vector table
    ld i, a
    R-Tape R-Tape April 2012 Development
  • Screen routinesHello. For my games I?m using the sprites routine method of a screen buffer and when I finish to print all the sprites I dump all the buffer in the …

    ... the Atari ST as the Z80 doesn't have quite enough ... need to come from a table (e.g. LD_SP,IY POP_DE ... with that screen row address table - either double it in length ...
    joefish joefish May 2012 Development
  • Machine Code Routine of the weekHow about a thread that has a routine each week that is in [B]assembly language[/B] and is also described in great detail what the hell is going on …

    ... ;636329]
    It implements a "table lookup" routine, used when reading ... code is pressed. The lookup table is shared with the key ... />
    The difficulty from the z80 point of view is that ...
    Alcoholics Anonymous Alcoholics Anonymous June 2012 Development
  • Zymosis -- WTFPL'ed Z80 Emulation Corebreaking news! i'm back with another useless project: new Z80 emulation core written in pure C! i hear you screaming: "oh, no! WHY?!" let me tell yo…

    ... , got BorderTrix right!

    z80 state and ULA port 'outing ... got rid of huge useless table too), and WOW! everything is ... that Zymosis is usable as Z80 core (that was the target ...
    Ketmar Ketmar July 2012 Emulators
  • Random number from a rangeHow can I generate in assembly a random number from a range, let's say 0-21 or 0-57? There are generators which make it 0-255. By using bit masks I…

    ... through the numbers in the table then your distribution changes to ... whatever you stored in the table and correlations will show up ... on the size of the table.

    The mod thing ...
    Alcoholics Anonymous Alcoholics Anonymous September 2012 Development
  • c64 > spectrum ?I was recently talking to a c64 coder, (the guy who wrote mega apocalypse on 64) and he was telling me the speccy maker of the game used something to…

    ... the code from 6502 to z80, I guess it can ... the 6502 features on the z80 (eg the zero page) ... of 6502 code to z80 code with careful mapping ... of z80 registers to 6502 registers ... emulate each 6502 instruction via table lookup, rather than do ...
    Alcoholics Anonymous Alcoholics Anonymous September 2012 Development
  • Revisiting Spectrum CPU clock regenerationWarning: This post will be a bit nerdy :-) Some time ago, I experimented with phase locked loop circuits as a possible way to regenerate the Spectru…

    The book happens to be on my table, from the list on page 231:
    Pin 32, /PHICPU, cell 28, inverting open-collector output, inverted 3.5 MHz clock for Z80.
    roko roko October 2012 Hardware
  • Fantasy Z80 instructions?This follows on from something catmeows said in another thread, and that I've been meaning to ask for a while. This may sound daft to people with mo…

    ... Call relative, CALR d
    Table translation (for encoding/decoding), TRDB ... Jackson - a recommended read for Z80 fans.

    The ... chips were backward compatible with Z80 opcodes in one mode, ... popular use of the Z80 within home computers/calculators ...
    RST#08 RST#08 November 2012 Development
  • Video generation using a CPUWe know it is possible to generate a video signal using a CPU, and this technique was often used on low-end computers in the early 1980's (for exampl…

    ... normally points to the character table in the ROM.

    Z80's refresh cycle, which allows ...
    Matt_B Matt_B January 2013 Chit chat
  • SPECTRA New from Paul FarrowLooks good! Read about it [URL="http://www.fruitcake.plus.com/Sinclair/Spectrum/Spectra/SpectraInterface.htm"]here[/URL]

    ... of the hardware on the table....

    Works solidly with ... FATWARE). Again loaded tap and z80 files directly.

    All ...
    BloodBaz BloodBaz January 2013 Sinclair Miscellaneous
  • The Disciple clone... doable?Hi. As a spectrum user in the 80's this was the dream interface all-in-one for me. I have a 48k+ and planning on get a 128K toast-rack later. Anyway…

    ... I would guess that RealSpectrum, Z80 (the emulator) and X128' ... this on. RealSpectrum and Z80 seem to have the ... 's bus (and the Z80) in named MREQ. I ... the Spectrum's (and the Z80) is named M1. Again ... involves generating a truth table by cycling through all ...
    zub zub February 2013 Hardware
  • Assembler v Machine CodeHi. I've been looking at a lot of the code examples in the Development section and can see that Assembler is the way to go. However, I was wondering …

    ... still code using a z80 opcode table on a bit of paper ...
    jamorski jamorski March 2013 Development
  • Assembler v Machine CodeHi. I've been looking at a lot of the code examples in the Development section and can see that Assembler is the way to go. However, I was wondering …

    I have a self-made printed out (dot matrix) table of alphabeticaly sorted Z80 opcodes and the decimal values, and I poked them in BASIC to enter Assembly subroutines. Never ever used a dedicated Assembler.
    Nowdays I use Inline Assembler from ZXBC.
    LCD LCD March 2013 Development
  • Keyboard scanning routines / techniques?What keyboard scanning routines or techniques do people use? I'm looking to write something which doesn't rely on the ROM-based keyboard scanner, an…

    ... ="https://github.com/legumbre/gdb-z80"]porting GDB stub[/URL] to ... ZX Spectrum. GDB-Z80 knows how to read SDCC ... very limit of 3.5Mhz Z80). Wait states for each bit ... it returns a pointer to table of functions. Then you simply ...
    tstih tstih May 2013 Development
  • pathfindingworking on pathfinding in the game. here is Russian description of Lee's algorithm: [url]http://algolist.manual.ru/games/wavealg.php[/url] "if-then"…

    ... even on Z80. Or you might want to use precomputed table with ... case, or 2 if euclidean table was used). Therefore, one might ...
    Patrik Rak Patrik Rak May 2013 Development
  • Relocation with SDCCI desperately need auto- relocation with SDCC. Something that will compile all of my code using start address 0 and generate relocation table so that…

    ... This is the problem -- the z80 can't efficiently access stack ... forth in registers. The z80 compilers are at serious disadvantage ... it operates slightly differently. A table of pointers is maintained, ... out the deficiencies in the z80 compilers.

    [ ...
    Alcoholics Anonymous Alcoholics Anonymous June 2013 Development
  • FZX: a new standard format and driver for proportional fonts[B]FZX[/B] is a very compact and efficient (although extremely flexible and powerful) standard format to create new fonts for the ZX-Spectrum. It sup…

    ... the FZX file structure. My Z80 asm skills are very rusty ... /> 1. When I load the table of offsets, the first offset ... than to get out a Z80 asm manual and start working ...
    mleisher mleisher June 2013 Brand new software
  • Where do you stick the stack?...OK, so I've got a fair chunk of ASM code assembled from 24000 mark. The stack shouldn't get very big, just a few PUSHes and POPs of the main regis…

    ... i understand. The interrupt-jump-table-gab is such too. how ... , IF1[/QUOTE]

    The z80's im2 scheme is very ...
    Alcoholics Anonymous Alcoholics Anonymous July 2013 Development
  • SkoolKit 3.4SkoolKit - a suite of utilities for creating disassemblies of Spectrum games in HTML (and ASM) format - has reached version 3.4. Some of the new stuf…

    ... 8-bit (just like the Z80's 8-bit databus).
    table implementation (A=index) from a ...
    Jon Needle Jon Needle July 2013 Announcements
  • C.G.D - Classic Game Designer[b]UPDATE: August 07, 2013 AN UPDATED VERSION OF CGD IS NOW AVAILABLE, DETAILS HERE: [url]http://www.worldofspectrum.org/forums/showpost.php?p=7155…

    ... will mess up a jump table so the map would in ... free to send me a z80 & I can see what ...
    R-Tape R-Tape August 2013 Brand new software
  • Retro Gamer 119This issue is out later this week. Thought I'd mention it because in addition to my own 2-page making of Deactivators, which is an ace game and would…

    ... were being used as a table by games programmers. "The TV ... time since I wrote any Z80 code though!" He may also ...
    chev chev August 2013 Announcements
  • Movin And A Groovin Horizontal Flip improvementOn the left is the flip horizontal portion from Andy Pennell'S excellent Movin' & a Groovin' machine code screen routines from Your Spectrum #19 (Oct…

    ... faster, then using a lookup table method as follows, but there ... ]Horizontally Flip screen z80 fast using a lookup table.

    ... Bytes

    Create lookup table to 256 byte boundary (requires ...

    256 byte table will look like this:
    jamorski jamorski August 2013 Development
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