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  • Poor C64 speccy conversions[youtube]fNoqq9Vfc0g[/youtube] I ran across the above - and was struck by the graphics. At first I thought it was the speccy version, but then I rea…

    ... better job converting the games to the Amstrads...but if they ... the CPC allowed four colour high resolution mode, isometric games could have ... machine then you tend to have longer to spend on the game ... specific machine are more likely to be written by someone with ...
    ewgf ewgf October 2013 Games
  • Poor C64 speccy conversions[youtube]fNoqq9Vfc0g[/youtube] I ran across the above - and was struck by the graphics. At first I thought it was the speccy version, but then I rea…

    ... gfx.[/quote]

    The high resolution mode on the Atari 8 ... ]Tower Toppler[/b] uses that to generate it's colour so ... an odd design choice to limit colour use to half a dozen ...
    TMR TMR October 2013 Games
  • 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…

    ... token to isolate high nibble
    rra ; move the high nibble into the low ... accumulator
    inc hl ; point to high byte of the offset
    inc b ; add carry to high byte of counter (4T)
    stephenw32768 stephenw32768 October 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…

    ... :
    ld a,c ; read low byte of byte counter
    to A
    add a,(hl ... /> [B]inc b ; add carry to high byte of counter (4T)[/B ...
    Dr BEEP Dr BEEP October 2013 Development
  • Issue 3 board with strange piggy-back boardIn case you are interested. I?ve never seen something like this before. I have an Issue 3 board here. When I opened the case and found a strange pig…

    ... , so that it's difficult to reverse-engineer and start selling ... addresses that you need to access, in order to switch pages. The ... MSB) of the RAM chips to high or low.
    Considering that the ... extra 32k... and another command to select page.
    Just my ...
    skagon skagon October 2013 Hardware
  • Quick fix for four joysticksHere's a quick modification to add four joysticks to any Speccy. This assumes you already have two Sinclair ports. [URL="http://joefish.co.uk/specc…

    ... it should be able to convert it to detect IN 55 by swapping ... higher bit (e.g. A6 low, like a DK Lightpen) ... interface is only detecting A6 low, then when you do ... based joysticks (#EF in the low byte instead of #FE) ... but A4=low is treading on the toes ...
    joefish joefish October 2013 Hardware
  • SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…

    ... , sa_data_1 ;
    inc hl ; point to low length of variable
    ld ... workspace
    inc hl ; point to high byte
    ld a, (hl ... ), e ; store low byte
    inc hl ; point to next location
    chev chev October 2013 Development
  • SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…

    ... ld a, (de) ; compare high line number byte
    cp ... ld a, (de) ; compare low line number byte
    cp ... pointers
    dec de ; to high byte
    jr nc, me_new_l2 ... and %11100000 ; consider bits 7 to 5
    cp %10100000 ; ...
    chev chev October 2013 Development
  • ZX Spectrum in concert ;)The concert took a place in Gdansk (Danzig) in 26.10.2013. First videos appear. [url]http://youtu.be/w6L7uMVe3DA[/url] (2 songs: the first from Atar…

    ... the time - but I had to take a small monitor for ... ST. The program is in high resolution or the letters/signs are ... . So I wasn't able to see the stuff on Atari ... music, so I simply had to use it.
    This and ...
    Yerzmyey Yerzmyey October 2013 Sinclair Miscellaneous
  • Incapacity benefit medical and welfare rightsI've been on incapacity benefits for about 10 years now and in that time I've had 3 medicals. The last one was just last month. Every time I'm decl…

    ... , and a general inability to function socially, and experiencing ... and very suppressed appetite due to high dose of anti-depressant medication ... about five miles also to get to that work... earned ? ... didn't work for to supplement my low mood.

    ...
    dmsmith dmsmith November 2013 Chit chat
  • idea: new gaming interface for ZX Spectrum (48k)First of all, I am not an expert this is just an idea of what I would like to see happening in the modern era of the ZX Spectrum. A compact, small, …

    ... code would have to be awfully efficient to be able to service a ... cycle (time from IORQ going low until the Z80 samples the ... , and a further 3 to jump to your interrupt service routine), leaving ... , and then return them back to high impedance state before the Z80 ...
    Winston Winston November 2013 Hardware
  • using the raspberry pi for the zx spectrumI just saw where they are now using a Pi to emulate a floppy disk drive for the Amiga. So it got me wondering if this could be done for the ZX Spectr…

    ... be wired directly to the Spectrum edge connector to 'simulate' an ... to a joystick port, where it just has to put different pins high ... or low to indicate the ... channel that's designed to accommodate the devices on ...
    gasman gasman November 2013 Hardware
  • Microdrive Cartridges.Anyone got any mdrv carts they want to get rid of? Let me know! -Stacey

    ... takes what seems like days to walk around the Ikea at ... 'm talking about are of low quality, which is good in ... /> Other felt pads are way to high.

    The result:
    bverstee bverstee December 2013 Wanted
  • Microdrive Cartridges.Anyone got any mdrv carts they want to get rid of? Let me know! -Stacey

    ... 'm talking about are of low quality, which is good in ... /> Other felt pads are way to high.[/QUOTE]
    Thanks Ben :D ...
    I will have to investigate.

    [B][I ...
    1024MAK 1024MAK December 2013 Wanted
  • Please explain how a Kempston interface circuit works.Can someone help me understand how a Kempston joystick interface works, as I want to design and build my own as an experiment. I understand switches…

    ... active low. Meaning they are normally at a logic high ... drives /IORQ low (meaning the CPU wants to access input ... drives /M1 and /IORQ low to signal that it is responding ... to a high impedance state (electrically disconnected from the bus), neither low or high ...
    1024MAK 1024MAK January 2014 Hardware
  • New Game: "SPECTRA Blitz"Hi! No screenshots because there is still no Windows Emulator that supports SPECTRA advanced graphics modes (I was told, it is too hard to support al…

    ... Panasonic PVR tonight and then convert it to a mp4.[/QUOTE]
    high class VCR's have it ...
    LCD LCD February 2014 Brand new software
  • +2A socketsI have seen an internet site which mentions 48k loading programs/games from a pc sound card (can't fiond it now!!!). Is this possible to with a spec…

    ... laptop headphone output socket, straight to my +3 tape input socket ... web browser. It can also convert these to WAV files, and theres ... of the device connected to your Spectrum low, and adjust it till ...
    Your Spec-chum Your Spec-chum March 2014 Hardware
  • Spectrum Not Responding to Keyboard InputHello, sorry if this thread is not in the correct place, This is my first post and I'm not sure where to post this type of thread. :lol: Anyway, I r…

    Sorry to hear you've been having ... line low or high.

    Also, when it does boot to the ... copyright message, did you perhaps hear any low pitched ... almost definitely need to wield a soldering iron to fix the issue ...
    balford balford March 2014 Hardware
  • Mr Heli - my new mod (w.i.p.)I really liked modding Spectrum games and would like to share my new project with you :) I took arcade port Mr Heli. It is actually a good game with…

    ... version by adding some dithering to simulate a half-bright ... the spectrum version reconverted back to 128x192:
    [IMG]http ... that the C64 also used to same source graphics.
    ... that conversion from the original high-resolution arcade graphics looks much ...
    4throck 4throck April 2014 Games
  • Mr Heli - my new mod (w.i.p.)I really liked modding Spectrum games and would like to share my new project with you :) I took arcade port Mr Heli. It is actually a good game with…

    ... version by adding some dithering to simulate a half-bright ... the spectrum version reconverted back to 128x192:
    [IMG]http ... that the C64 also used to same source graphics.
    ... that conversion from the original high-resolution arcade graphics looks much ...
    BiNMaN BiNMaN April 2014 Games
  • Fixing/modding my new +3Hi, In december I won an auction for a working +3 with a dead floppy drive, + a Multiface 3, some disks and tapes, for a very low price (I think nob…

    ... it with the +3 to convert some dsk to 3" disks)...
    ... with my iPhone, and convert them to 3" disks of course ... 3G too) isn't high enough... I found an ... So all I had to do, was to find a dedicated tape ... the mini Sinclair recorder to a retro meeting between ...
    bugpat bugpat April 2014 Hardware
  • Fixing my old ZX Spectrum 48K issue 4AHi Guys, I trying to fix my old Spectrum 48K. Looks like my dad used a wrong power supply as the ULA had a bit missing and so did the 7805. So I rep…

    ... missing without causing any harm to the computer, although naturally ... recently reported a similar fault to your original one (computer ... not responding to keyboard input) when one ... holding the line either low or high (I can't remember ...
    balford balford June 2014 Hardware
  • ZX Spectrum Clock Signal Restorer Circuit[SIZE=5][U][B]ZX Spectrum Clock Signal Restorer Circuit[/B][/U][/SIZE] The circuit below is an experimental circuit. It has only been "tested" using…

    Other possible parts to try:
    ... course, the trick is to come up with a circuit ... means the circuit has to cope with a good ... TTL levels (logic low too high, logic high too low, or both!). ... And, with minimum edge/signal delay and trying to ...
    1024MAK 1024MAK June 2014 Hardware
  • I wonder what this is?Just having a browse on ebay and came across [URL="http://www.ebay.co.uk/itm/191216974918"]this[/URL], I wonder what its for?

    ADC suggests an Analogue-to-Digital converter board, although ... />
    "For producing extra-high resolution graphics for the ZX81, this ... inverted video, enabling the user to draw lines, circles and ... fillings and textures. Up to 32 user defined graphics are ...
    balford balford June 2014 Hardware
  • I wonder what this is?Just having a browse on ebay and came across [URL="http://www.ebay.co.uk/itm/191216974918"]this[/URL], I wonder what its for?

    ... that later...

    Back to the board with the Maplin ... 3 No. 9 December 1983 to February 1984 reveals some details ... is part of an analogue to digital converter project. Said project ... well.

    The Extra High Resolution Graphics for the ZX81 PCB ...
    1024MAK 1024MAK June 2014 Hardware
  • Chloe 280SEHi all, Could somebody tell me how far this project is to being complete? [url]https://github.com/cheveron/sebasic4/wiki/Chloe-280SE[/url] Im ver…

    ... any future Super Spectrum to be backwards compatible. ... be offered at a low cost that mimicked ... that costs had to be kept low to ship units like ... that in large quantities and to ... supporting the older screen resolution and colour palette as ...
    retrogod retrogod July 2014 Development
  • What if Sinclair had released a 16 bit Spectrum?Had Sir Clive not wasted his companies money on the white elephant that was the C5 and instead focused on competing with his rival computer manufactu…

    ... of 8-bit Z80. High resolution colour graphics with no attribute ... 256x250 full colour resolution was never going to be fast on ... But Sinclair either needed to develop a bespoke but extendable ... opinion).

    Due to unfavourable media coverage, they also ...
    RST#08 RST#08 July 2014 Games
  • Bypassing bits of faulty ULAs: the LOAD!Hi everybody, Recently I had a sick Spectrum sent to me. The symptoms were that the machine would run fine, except that it wouldn't load. The border…

    ... disabled, the 74LS125 goes into high-impedance, so doesn't affect ... is therefore HIGH when we're not saving, and LOW when we ... are.
    The output needs to go to a ... logical LOW (saving is active) to HIGH. The 74LS375 then gets this high and ...
    Spirantho Spirantho July 2014 Hardware
  • New Spectrum related website.Some of you may have seen on Facebook, but I'm working on a new website [URL="http://www.zx-artwork.uk"]www.zx-artwork.uk[/URL] to host all my hi-res…

    ... 't mind uploading some high quality scans of my ... this is going to be a service to the community there ... needs at least to be a standard for ... And is 300 dpi considered high resolution in 2014? Maybe it will ... a cover that you want to make a poster from? ...
    pmsr pmsr August 2014 Announcements
  • New Spectrum related website.Some of you may have seen on Facebook, but I'm working on a new website [URL="http://www.zx-artwork.uk"]www.zx-artwork.uk[/URL] to host all my hi-res…

    ... this is going to be a service to the community there ... needs at least to be a standard for ... And is 300 dpi considered high resolution in 2014? Maybe it ... />
    I'm open to suggestions for the standards, I ... want to open this up for ...
    blughes blughes August 2014 Announcements
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