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  • What are the chances?Hi all, I've picked up an issue 3B, fairly clean board, no mods, wasn't starting correctly so I tried Brendan's diagnostic ROM and got this: [i…

    ... else could be to blame? Logic chips perhaps? I've recapped ...
    Jet5y Jet5y June 2016 Hardware
  • TommyGun with Debugginghttp://goo.gl/HfSXev?gdriveurl Ok, so this is a pretty big release for me and I have added a lot of stuff into the code editor. Mainly of course …

    ... to go to next bookmark, Shift+F2 to go back to ...
    Kiwi Kiwi July 2016 Development
  • "Decoding z80 Opcodes" (http://www.z80.info/decoding.htm#intro) - Incorrect HALT Opcode?Apologies if this is a dupe but I searched within the forums and couldn't find anything. I've been working on a z80 emulator (for academic and rec…

    ... #intro to write the decoding logic. In the decoding tables it ...
    Travis Kaufman Travis Kaufman July 2016 Development
  • Recreated ZX Spectrum - something positive for a changeI've spend the last couple of hours mashing rubber keys and playing various Spectrum classics on a 42" TV, wirelessly. Despite the bad press that …

    ... />
    I noticed that Symbol Shift is not picked up in ...
    Bad Horsey Bad Horsey July 2016 Hardware
  • Spectrum version of Pacomix2?There is a very good logic game [b]Pacomix 2[/b] on Amiga. Gameplay is here: [url="https://www.youtube.com/watch?v=1jQbqyZYVrM"]https://youtube.com/w…

    There is a very good logic game [b]Pacomix 2[/b] on Amiga. Gameplay is here: [url="https://www.youtube.com/watch?v=1jQbqyZYVrM"]https://youtube.com/watch?v=1jQbqyZYVrM[/url]
    Is there any Spectrum game based on the same idea?
    PopoCop PopoCop July 2016 Games
  • Line DemoI was looking in the source code of another game (that Akalabeth game), with lots of line drawings. The difference was that they don't use the PL…

    ... it's own keyword, Extended Shift 3, so it's probably ...
    Timmy Timmy August 2016 Sinclair Basic
  • Need some help repairing an issue 3 spectrumI am looking for some help repairing an issue 3 speccy, here's what I tried so far. The speccy is not booting up correctly, when using the diagnos…

    ... no difference. Upper memory and logic is not installed.

    patzik patzik August 2016 Hardware
  • Spectrum chiptunes cassette AGAIN :)Hey. Not that new songs but at least for the tape-recorders' fans. :) Strudel Tapes Label from Russian Federation has published those, this m…

    ... :10]
    5. Yerzmyey - Blazar Shift (ZX Spectrum / Atari 520ST) [2 ...
    Yerzmyey Yerzmyey August 2016 Sinclair Miscellaneous
  • Some Graphic Coding & Audio help.Hello my fellow WoS'ers I am in the process of writing some code for graphical purposes - I have Z88DK raring to go but I do not know how to take…

    ... , well I know how to shift bytes but I do not ...
    Zetr0 Zetr0 August 2016 Software
  • Upper memory issueZX Spectrum 48K, issue 2, boots fine. Lower RAM OK. When tested with the new test ROM in the Diagboard, for all upper RAM tests "FAIL" is shown. I…

    ... was socketed too, no other logic chips had sockets.

    logic IC's?
    georgedb georgedb September 2016 Hardware
  • Bob Smith's zx81 games (and others like UWOL 81) should be ported to the zx spectrumThere's a bunch of great zx81 games made recently. I think that by maintaining the same blocky grafix and by adding color and sound, games like one…

    There's a bunch of great zx81 games made recently. I think that by maintaining the same blocky grafix and by adding color and sound, games like one little ghost, crozxy road, virus, boulder logic etc would be just great...
    gabriele amore gabriele amore September 2016 New game ideas
  • Mastering flagsI'm little lost when different flags are set/reset after logic operations, and what conditions must be met. For example, [code] ld a, MODE…

    ... flags are set/reset after logic operations, and what conditions must ...
    Bedazzle Bedazzle September 2016 Development
  • Keyboard issues. Select keys not working.Hi Guys, Well it seams problems are like buses, you wait awhile, nothing turns up, then a couple at once. I have just got one issue 2 48k going…

    ... ie 1,Q,A,CAPS SHIFT and 0,P,ENTER, BREAK ...
    RSwipeCA RSwipeCA September 2016 Hardware
  • Proportional fontsI've been doing some proportional font drawing, purely on C level at the moment, but it's orders of magnitude slower than I'd want it to be. It's sti…

    ... move to the next byte, shift the mask backwards and write ...
    Sol_HSA Sol_HSA October 2016 Development
  • HILOW Interfaces informationHi recently i came across the HiLow tape interfaces, this units where build and sold on Uruguay by the same team that developed games like NarcoPoli…

    ... the drive is pressed + symbol shift if you do a save ...
    soviet9922 soviet9922 November 2016 Hardware
  • ToothacheFor the first time in my 42 years I have toothache, it started last week and I tried to ignore it but it's starting to get worse. Thankfully, I mana…

    ... the work has changed my shift but I'm really, really ...
    zx1 zx1 December 2016 Chit chat
  • Upper memory not available in issue 2A friend send me his issue 2 Spectrum for diagnosis. It boots okay but for some reason won't load games over 16kB. He sent also a Smart Card with int…

    ... both cases. I used the logic probe to check A15 but ...
    protek protek January 2017 Hardware
  • Original Grey +2 Picture IssuesSo, I have my +2 connected to an old CRT TV, and the Speccy has been working fine. Decided to have a shift around, but once I moved the +2 i've lost…

    ... fine. Decided to have a shift around, but once I moved ...
    SimonLCFC SimonLCFC January 2017 Hardware
  • Looking for advice on building a HarlequinNew member here. From the US. My first computer was a Timex Sinclair 1000 back in the early 80s (in fact, I got one of the first batches sold in th…

    ... out to have all this logic consolidated into a CPLD. Apparently ...
    msansom msansom February 2017 Hardware
  • Spectrum 48k Clock SpeedSo I was reading the [url="http://www.worldofspectrum.org/pub/sinclair/technical-docs/ZXSpectrum48K_ServiceManual.pdf"]Spectrum 48k Service Manaul[/u…

    ... external source controlled by the logic
    gate array (ULA) and ...
    msansom msansom February 2017 Hardware
  • Getting a +3 working again (keyboard & tape socket issues)So, as part of my Spectrum restoration project I will also try to tackle the problem child among my fleet, the +3. PROBLEM ONE: Ever since I firs…

    ... keys which are all Caps Shift plus a non-working key ...
    The Mighty Dopethrone The Mighty Dopethrone February 2017 Hardware
  • "ZX80 Brain" RPN CalculatorIt is at times like [url=https://www.worldofspectrum.org/forums/discussion/54176/depression]when threads such as this are posted[/url] that I get the…

    ... have used POKE 23606 to shift them vertically, but I needed ...
    The Mighty Dopethrone The Mighty Dopethrone March 2017 Sinclair Basic
  • Harlequin Rev G - Decoupling Capacitors?Guys - I started assembling my Rev G Harlequin board over the weekend. Right after I picked it up and started loading parts, it struck me that there…

    ... that's just the 74HCxx logic. The thing that really concerns ...
    msansom msansom March 2017 Hardware
  • Jet Set Willy 2's original author releases a modded version of the game!Apologies if this has already been posted, but Derrick P. Rowson, the original author of Jet Set Willy 2, has been modding JSW2, and the latest versi…

    ... in Eggoids have had their logic extended. They now bounce off ...
    ewgf ewgf March 2017 Games
  • Need help from people with CRT TVs (50 Hz)I’m wrapping up the development of my [url="https://www.worldofspectrum.org/forums/discussion/54152/new-game-a-yankee-in-iraq-2017-a-shoot-em-up"]gam…

    ... on a rate for changing “rotation speed” of the helicopter rotor ...
    Ast_A_Moore Ast_A_Moore March 2017 Development
  • Another 48k Speccy acting as a 16K model.Hi all, I originally was going to post asking for help to fix the new addition to my family a very nice condition Issue 2 sold on ebay as a 16K model…

    ... looking for any info on logic test points in the 48K ...
    povvercrazy povvercrazy April 2017 Hardware
  • Fastest way of reading from EAR portI'm trying to work out the fastest way of reading data from the EAR port and assembling the bits into a byte. I came up with this code: IN A, (C) ; …

    ... , 4 cycles
    RLL D ; shift carry into D register, 8 ...
    i love the z80s i love the z80s April 2017 Development
  • ZXSCLZF - Yet another Screen CompressorQuick disclaimer before I continue, this compressor does not shrink screens as small as some of the others posted here, in particular the very good z…

    Quick disclaimer before I continue, this compressor does not shrink screens as small as some of the others posted here, in particular the very good zx7/rcs, but was written for a specific reason for The Order of Mazes back in 2015 and also because I wanted ...
    TomD TomD April 2017 Development
  • Spectrum 128k 2a or not 2b....Just picked up a +2 black case version and I'm in as little bit of a quagmire, The case is definitely black, has '+2A' stamped on the bottom, but in…

    ... also has all the fdd logic cut away.
    Both the ...
    povvercrazy povvercrazy April 2017 Hardware
  • how does this multiplication routine work?taken from chuntey wordpress: imul ld e,d ; HL = H * D ld a,h ; make accumulator first multiplier. ld …

    ... carry.
    imul2 rl e ; shift de 1 bit left.
    slenkar slenkar July 2017 Assembler
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