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  • Microdrive Serial ProtocolGentlemen, I've been dreaming for a long time to develop a Microdrive emulator, where an SD card loaded with .MDR cartridge images can be accessed t…

    ... bytes. This means that one byte is sent/received from/to ...
    Falco-F8L Falco-F8L June 2013 Hardware
  • Machine code assistance please #1Dear all, Learning the ropes here, so please excuse these odd questions which may seem simplistic to you learned lot. This routine is placed at 33…

    ... something to do with high-byte / low-byte, as I can't ...
    Tobo Tobo June 2013 Sinclair Miscellaneous
  • 80 column BASIC in FUSEThis requires FUSE 1.1.0 or later: 1. Select machine [b]Spectrum SE[/b]. 2. Enter the command [b]MODE 1[/b]. Currently tape traps are not supported…

    ... doesn't have the trapped byte in the expected place so ...
    chev chev June 2013 Sinclair Basic
  • Loft clear out = reunited with specify games - please help meHi all, I was wondering if someone could help me please? My mum recently downsized and I discovered all my old spectrum games hiding in the loft! Br…

    ... 's party

    Bug byte
    Styx
    Twin kingdom ...
    Dizzy Linds Dizzy Linds July 2013 Sales
  • display file addressing; screen slicingWhile working on this Compendium I'm updating or rewriting a lot of stuff. One thing I eventually came to appreciate was the simple & clever way in w…

    ... posted here uses fixed 32 byte blocks so the slice can ...
    Battle Bunny Battle Bunny July 2013 Sinclair Basic
  • 20-column multicolour: a half-baked ideaI was writing an email reply to one Mr Jowett about multicolour routines, and in that way that explaining something to someone else makes you think "…

    ... (which means writing the leftmost byte as soon as the ULA ...
    gasman gasman July 2013 Development
  • Mirroring UDG'sJust wondered is there a quick an easy way of mirroring UDGs (byte values)? i.e. BIN 11110000 becoming 00001111 etc.

    Just wondered is there a quick an easy way of mirroring UDGs (byte values)?

    i.e. BIN 11110000 becoming 00001111 etc.
    daveysludge daveysludge August 2013 Development
  • Clashbasher a new interface to reduce colour clashI've been working on this for a while now. [IMG]http://markamy.uwclub.net/cauldron.JPG[/IMG] Basicly its an add on for a 48k spectrum, which reinte…

    ... just by changing the attribute byte you need to make ... be started whenever an attribute byte is changed, if a corrisponding ... display byte hasn't been modified before ... down then every byte corrisponding to that attribute byte in the display ...
    Basher Basher August 2013 Hardware
  • Hardware description - DivIDE interface[B][U]DIVIDE interface / DivIDE 2k11[/U][/B] [B][U]The main description[/U][/B] DIVIDE is IDE interface with own external memory. Thanks to very goo…

    ... after read this instruction byte), after reading this byte is automatically connect ... memory. CPU read first instruction byte from external memory, disconnect external ... after read this instruction byte), after reading this byte is automatically disconnect ...
    velesoft velesoft August 2013 Hardware
  • Adding a pause key to ArkanoidHaving rediscovered the simple pleasure of playing 1980s games on genuine 1980s hardware, I've also remembered that emulation can provide a feature m…

    ... port (0xFE) with the high byte of the port number specifying ... /> Address 0x84C2 contains the three-byte instruction LD BC,0xF7FE, preparing ...
    stephenw32768 stephenw32768 August 2013 Games
  • Hardware description - MULTIFACE 3[B]Hardware description - MULTIFACE 3[/B] This is description of MF3 clone, because I can't find more about original interface. Schematic and PAL ch…

    ... -D0(low 4 bits of byte) of values writed to ports ... detect if CPU read instruction byte from address #0066. If detected ...
    velesoft velesoft August 2013 Hardware
  • 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…

    ... fliph2 LD A,(HL) ; grab byte
    EX AF,AF' ... ,(IX+0) ; grab next byte
    LD (HL),C ... IX+0),A ; poke flipped byte
    EX AF,AF' ... (HL),A ; poke flipped byte
    ADD HL,DE ADD ...
    MatGubbins MatGubbins August 2013 Development
  • Routine for Currah speechI'm currently writing a routine for the Currah that will provide speech during a game. A timer is set to initiate the speech every 50 cycles of the …

    ... to 1 below the last byte in buffer
    ld (65364 ...
    daveysludge daveysludge August 2013 Development
  • Larry The Lander II-Cosmic Carnage[size=4]LARRY THE LANDER II ? COSMIC CARNAGE[/size] By Steve `Jammajup` Dixon 2013 Purple Unicorn Software [u]The Story[/u] Deep in space Larry rec…

    ... use with emulators with flash/byte load[/url]
    [url=http ...
    jammajup jammajup August 2013 Brand new software
  • Job Lot of over 160 Items ZX Spectrum[url]http://www.ebay.co.uk/itm/Job-Lot-over-160-Items-ZX-Spectrum-C64-PS1-PS2-PS3-PSP-Xbox-Dreamcast-/161097186089[/url] ZX Spectrum games ATV Si…

    ... /> Codename Mat 2 By Bug Byte
    Colony By Bulldog Software ...
    thegameguy thegameguy September 2013 Sales
  • 800+ Spectrum 128k & 48k original titles still availableHi guys, The original thread was a bit messy and has vanished from the front page, so rather than bump it, here it is again a bit tidier: All origi…

    ... /> Buombscare
    Butch Hardguy
    Byte Bitten
    Caesar The Cat ...
    Kilmannan Kilmannan September 2013 Sales
  • Manic Miner - Loader And Screen DifferencesThere are some changes between the various releases and re-releases of Manic Miner with both the loader and the loading screen itself. Here I'll deta…

    ... versions:

    The Bug Byte release (this comes in two ...

    [B]Loader (Bug Byte) original:[/B]

    [img ... ]

    [B]Loader (Bug Byte) 'alternative':[/B]

    [img ...
    spider spider September 2013 Sinclair Miscellaneous
  • 128 BASIC-compatible way of loading BASIC as code?On a 48K Speccy (or from 48 BASIC or USR 0 mode on a 128K machine), one can do a silly trick like this: [code];; load a 4000 byte BASIC program ld i…

    ... />
    [code];; load a 4000 byte BASIC program
    ld ix ...
    stephenw32768 stephenw32768 September 2013 Development
  • RCS HelpThis plea for HELP is related to the RCS screen handling routines thread. To further save space in the current crop of routines its looking like the …

    ... wondering if using the 11 byte method here its possible to ...
    jamorski jamorski September 2013 Development
  • LZ4 decoderI encountered the [URL="http://code.google.com/p/lz4/"]LZ4 compressor[/URL] a few weeks ago. Reading the [URL="http://fastcompression.blogspot.co.uk…

    ... /> ;;
    ;; Leaves HL pointing one byte past compressed data and DE ... /> ld c,a ; copy into byte counter
    cp 15 ; see ... /> ld a,c ; read low byte of byte counter (4T)
    .getlength_2 ...
    stephenw32768 stephenw32768 October 2013 Development
  • Spectrum Software : = Sports SimsDrop me an offer by PM if any of the following is of interest. Football Indoor Soccer (Alternative) Football Manager (Addictive) The Double (Summit…

    ... (Maynard)
    american football (bug byte)

    darts

    smogit smogit October 2013 Sales
  • A few questions about ZX Spectrum assemblyHi, I have a few questions about ZX Spectrum assembly language programming: - What's the best assembly tool for ZX Spectrum? I tried a bit the ZXSpi…

    ... ? I would like to define .Byte, .Word and string variables but ...
    Zerg Zerg October 2013 Development
  • Assembly - Loops bigger than 255Hi, It looks like it's a bit difficult to make loops with more than 255 cycles on Z80 machine code, since the 16-bit decrements (DEC) do not alter a…

    ... : a loop decreasing the low byte inside a loop of decreasing ... the high byte:

    [CODE]; A simple ... B,E ; Load the lower byte into B, for DJNZ
    byte into C
    XOR A ...
    Zerg Zerg October 2013 Development
  • Copy 4Kb in Assembly?Here's an interesting problem: what's the best way to copy a block of 4Kb in assembly? The most obvious solution is to use [B]LDIR[/B]: [CODE] l…

    ... taking 86041/4096 = 21T per byte on average. Also the code ... 51204/4096 = 12.5T per byte on average. However the code ... 67365/4096 = 16.45T per byte on average, and it takes ... 67225/4096 = 16.41T per byte on average, and it takes ...
    Einar Saukas Einar Saukas October 2013 Development
  • Nasty 'Gotcha' for multicolour timingI thought I would be better developing my multicolour routine on the 48K first, being the slowest, so it would then be sure to work on the 128K varia…

    ... form which is one prefix byte longer than using HL. There ...
    joefish joefish October 2013 Development
  • Rendering clipped glyphSometimes you need to render a glyph of arbitrary size to the screen. And clip it. For example: drawing a mouse cursor means combining drawing of a…

    ... br /> glyph_t *glyph,
    byte x,
    byte y,
    rectangle_t *clip_rect ... with two tables on 256 byte boundary for fastest vmem ... to point 12 then first byte mask will be 11111110 ... and end byte mask will be 00000111. ...
    tstih tstih October 2013 Development
  • z88dk and im2I set up a minimal IM2 mode so I can draw sprites for a laff [code] #include <string.h> #include <stdio.h> #include <im2.h> #include <stdlib.h> #in…

    ... (0xd300, 0xd4, 257); // initialize 257-byte im2 vector table with all ... .
    ld a,200 ; high byte of pointer table location.
    ld i,a ; set high byte.
    im2 ; select interrupt mode ...
    slenkar slenkar October 2013 Development
  • bitmap address to attribute addressI've searched, but I don't seem to find the proper keywords. I have a bitmap screen address in DL, character aligned (the address of the top byte of…

    ... (the address of the top byte of a character). For example ...
    na_th_an na_th_an November 2013 Development
  • that "listing variables during runtime" thingWell, I did eventually finish this, but with my meds playing up I don't have much time each day that I can spend at the computer, so it's taken rathe…

    ... always at least one spare byte in E_LINE, even if it ...
    Battle Bunny Battle Bunny November 2013 Sinclair Basic
  • Peculiar joystick interfaceAt first glance, these two items look very familiar: [url]http://www.ebay.co.uk/itm/Sinclair-ZX-Spectrum-Vintage-Computer-Joystick-Interface-DK-Tron…

    ... connector to read the high byte of the input address. This ...
    joefish joefish November 2013 Hardware
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Latest Posts

  • I am currently watching.....
    Paradigm Shifter on 12:49AM
  • New video about S-video modification on Issue two 48K Spectrum.
    Renegade on April 21
  • Fixed Speccy Software. And which games remained unfixed?
    John Elliott on April 21
  • Happy 40th Birthday to the Amstrad CPC464!
    rich_chandler on April 21
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    mel the bell on April 21
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    harriusherbartio on April 21
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    harriusherbartio on April 21
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