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<1…18192021222324…34>
  • ULAAre ULA's (for Spectrum 48k's) interchangeable through the different issues? To give some background, to work out what was wrong with an old speccy I…

    ... the Spectrum 48K ULA:

    - 5C102E: Original ULA, found on ... CPU in machines containing this ULA (Issue 2 boards).
    - ... incorporated into the 6C001E-7 ULA.

    All ... Chris Smith's excellent book, "The ZX Spectrum ULA".

    ...
    balford balford September 2015 Hardware
  • Is there a ZX Spectrum Hardware manual?I'm quite new to the ZX Spectrum world, looking for a definitive guide to the ZX Spectrum hardware so I can really start to understand what's going o…

    ... copy of "The ZX Spectrum ULA: How to Design a Microcomputer ... a modern book about the heart of Speccy hardware: the ULA and ...
    namtip namtip September 2015 Hardware
  • Vega ARM SOC?I read that the core of the new Vega was an ARM SOC. I thought it would have been an FPGA. But it seems it's an ARM running an emulator. Anyone kn…

    BTW, I just bought his book on making the Vega.
    < ... ARM is doing the Z80 / ULA emulation along with creating both ...
    cbmeeks cbmeeks October 2015 Vega
  • 7mhz CPU?One of the things I like about Spectaculator, is that I can zap the clock speed of the emulated CPU up. Doing so makes me wonder about why the desig…

    ... technology for a faster ULA may not have been ... ULA *might* have been OK (I don't have Chris's book ... gates constructed in the ULA is actually pretty quick ... cycle).

    The ULA was built using CML rather ... than TTL (feel the ULA - it's pretty warm ...
    Winston Winston December 2015 Hardware
  • Datasheets of the Spectrum 128K +2 ICs.Is there any place where I can find the datasheets of the ICs of the Spectrum 128K +2? I have tried to look for each of them separately but for some…

    ... the Sinclair ULA, this [url="http://www.zxdesign.info/book/"]book[/url] has ... nearly everything that is known about them. The ULA ... the ULA used in the earlier Spectrums. Note that the book does ...
    1024MAK 1024MAK July 2016 Hardware
  • Brightness level of non-bright attributes on classic ZX 48Does anybody know what was a brightness level of non-bright attributes on classic ZX 48? Was it the same on 128, +2 and +3? I can see on wikipedia a…

    ... ="http://www.zxdesign.info/book/"]The ZX Spectrum ULA: How to design ... includes the method that the ULA uses to generate the [url ... output signals (the 16k/48k ULA did not output RGB signals ... by the modulator.
    The book does give details of the ...
    1024MAK 1024MAK September 2016 Hardware
  • Brightness level of non-bright attributes on classic ZX 48Does anybody know what was a brightness level of non-bright attributes on classic ZX 48? Was it the same on 128, +2 and +3? I can see on wikipedia a…

    The blue output was altered during the Spectrum's design phase. At least I think that is what is said in the book [url="http://www.zxdesign.info/book/"]The ZX Spectrum ULA: How to design a microcomputer[/url].

    [b][i]Mark[/i][/b]
    1024MAK 1024MAK September 2016 Hardware
  • ZX Spectrum video waveformsAll work for this post was done on a ZX Spectrum issue 1 board (16k bytes of RAM only). This was what the Spectrum displayed on the TV screen: [i…

    The blue output was altered during the Spectrum's design phase. At least I think that is what is said in the book [url="http://www.zxdesign.info/book/"]The ZX Spectrum ULA: How to design a microcomputer[/url].

    [b][i]Mark[/i][/b]
    1024MAK 1024MAK September 2016 Hardware
  • ZX-Uno moddingStarting with ZX-Uno case modding I have not yet received my ZX-Uno yet (it is in the post) but I know that I will have to do at least one mod …

    ... puzzled out the spectrum ula and wrote a book upon which clones ...
    hikoki hikoki 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…

    ... of the Harlequin that the ULA's logic has been design ... is no difference between the ULA (uncommitted logic array) and GALs ... I bought Chris Smith's book and enjoy it.

    Claudius Claudius February 2017 Hardware
  • Send in the ClonesPlease name all the Spectrum clones out there ( I would say I need it back on my desk in 5 minutes , but I will be a bit more generous in this case!…

    ... Research Ltd} with custom ULA and SLOW mode, equipped ... + - The package included the book {ZX Spectrum+ User Guide|Sinclair ... well.#The package included the book {ZX Spectrum 128 Introduction ... connector.#The package included the book {Timex/Sinclair 2068 User ...
    Einar Saukas Einar Saukas March 2017 Hardware
  • Send in the ClonesPlease name all the Spectrum clones out there ( I would say I need it back on my desk in 5 minutes , but I will be a bit more generous in this case!…

    ... - The package included the book {ZX Spectrum+ User Guide| ... Research Ltd} with custom ULA supporting additional screen modes ... PAL (50Hz) video, custom ULA supporting additional screen modes ( ... NTSC (60Hz) video, custom ULA supporting additional screen modes ( ...
    Einar Saukas Einar Saukas March 2017 Hardware
  • ZEsarUX 6.1 BETAHi I have uploaded a new ZEsarUX BETA version 6.1. You can download it from the usual beta url: https://sourceforge.net/projects/zesarux/files/…

    ... a ZX Spectrum 16K/48K/+ ULA colour palette. It uses the ... measurements in Chris Smith's book and sets the colour saturation ... defects in the ZX Spectrum ULA colour system which I intend ...
    rga24 rga24 February 2018 Emulators
  • Fuse/SPIN vs Spectaculator border timingsHello, I'm trying to figure out at which moments the 48K ULA samples the current border color into its internal latch. To do that I wrote a small …

    ... Chris Smith's excellent book "The ZX Spectrum ULA: How To Design ... of a copy of Chris' book and read it thoroughly, it ...
    rich_chandler rich_chandler October 2019 Emulators
  • Fuse/SPIN vs Spectaculator border timingsHello, I'm trying to figure out at which moments the 48K ULA samples the current border color into its internal latch. To do that I wrote a small …

    ... screen area. However, if the ULA starts drawing the screen area ... the border chunk that the ULA started to draw at tick ... Chris Smith's excellent book "The ZX Spectrum ULA: How To Design ... ]

    I have this book and have read it through ...
    kosarev kosarev October 2019 Emulators
  • Fuse/SPIN vs Spectaculator border timingsHello, I'm trying to figure out at which moments the 48K ULA samples the current border color into its internal latch. To do that I wrote a small …

    ... a few errors in the book - I don't know if ... an int is generated in ula counter = 0 position has the ... ula again at count = 0 which ...
    Alcoholics Anonymous Alcoholics Anonymous October 2019 Emulators
  • Understanding tape edgesI've never done any tape reading code. But I've read about these "edges" on multiple occasions. Trouble is I don't understand what they heck they are…

    ... safety margins?[/quote]
    The ULA technology was designed to be ... devices. However, with the ULA that Sinclair used, it is ... same batch / type of ULA, and between different batches or ... ZX Spectrum ULA, How to Design a Microcomputer” book gives the ...
    1024MAK 1024MAK October 2019 Development
  • Direct drive LCD screen - looking for information on previous projects people may have attempted.Hi All, My first post, so please forgive and guide if I've posted in the incorrect section. I'm a speccy user from way back in the 80's, but m…

    ... and border changes to the ULA) to maintain their own internal ... they synchronise with and sniff ULA reads from RAM (I don ... got that far in the book!).
    RobeeeJay RobeeeJay December 2020 Hardware
  • Direct drive LCD screen - looking for information on previous projects people may have attempted.Hi All, My first post, so please forgive and guide if I've posted in the incorrect section. I'm a speccy user from way back in the 80's, but m…

    ... border changes to the ULA) to maintain their own ... synchronise with and sniff ULA reads from RAM (I ... got that far in the book!).[/quote]
    The SPECTRA ... Z80 writes to the ULA register. BUT you MUST ... can synchronise to the ULA’s picture generation. Otherwise ...
    1024MAK 1024MAK December 2020 Hardware
  • Were the full Sinclair Loki specs ever actually known?I was just curious. A lot was leaked to the media, but the exact specs seem different depending on source. Some say it could support up to 512x256 an…

    ... overestimated the ULA capacity... Just reading the Spectrum ULA design book and it ... series only had 11x11x4 cells. ( ULA's aren't somethng I ...
    cj7hawk cj7hawk October 2021 Hardware
  • Emulator compatibility with real SpectrumHi emulator programmers... Having spotted for the last 6 months that my iPAQ is still missing a Spectrum emulator I started typing last tuesday - an…

    ... is slower because of the ULA)?

    Or must I ...
    Anders Anders September 2001 Emulators
  • adventure gamesI always liked text adventures and the speccy had loads,my favourites were Robin of sherwood,,Espionage island,,emerald isle,,dracula,,secret of st b…

    ... was almost like reading a book where your imagination transported you ...
    Andy Gurr Andy Gurr January 2002 Games
  • Is there anything new to comeApart from doom. I personally don't think there has been anything all that innovative on the pc. Whereas the Speccy had handfuls of games in that c…

    ... out of the Spectrums history book and inspire me again.
    GeeKay GeeKay August 2001 Games
  • What was the first thing you did with your spectrum?This is like an addition to Stuarts topic what made you buy your spectrum,,,,ok what i want to know from you lot is when you got your speccy home,or …

    ... program in the little orange book that came,err was it ...
    Andy Gurr Andy Gurr August 2001 Games
  • Fangmole TunnelsI have been trying to find a game called 'Fangmole Tunnels'. It's listing that came as part of a tuturial book that I spent an unearthly number of h…

    I have been trying to find a game called 'Fangmole Tunnels'. It's listing that came as part of a tuturial book that I spent an unearthly number of hours typing in when I was a kid.

    Does anyone have it or seen it anywhere?
    Matt Matt February 2002 MIA/STP/SDP
  • C&VG mags I have quite a number of these for sale ranging from Aug.1982 to Jan 1988 and am open to offers. Also the C&VG Book of Games III. …

    I have quite a number of these for sale ranging from Aug.1982 to Jan 1988 and am open to offers. Also the C&VG Book of Games III.
    Mike.
    Mike Jeanes Mike Jeanes September 2001 Sales
  • Books for sale (continued)Spectrum Adventures a guide to playing and writing adventures ?6.00 The Spectrum Book of Games …

    ... ?6.00
    The Spectrum Book of Games ?6.00
    Spectrum Micro drive Book ?6.00
    Mastering the ...
    Mike Jeanes Mike Jeanes August 2001 Sales
  • Books for saleGames for your ZX Spectrum ?3.00 Instant Arcade Games for the Sinclair ZX Spectrum …

    ... /> Tim Hartnell`s Giant Book of Spectrum Games ?4.00 ... br /> The Sinclair User Book of Games and Programs for ... 00
    The Spectrum Pocket Book ?4.00
    20 ...
    Mike Jeanes Mike Jeanes August 2001 Sales
  • Books wanted:Hi Speccy fans, I would really appreciate any help with getting hold of the following book: Clark, William. Make and Program Your Own Robots. For t…

    ... getting hold of the following book:

    Clark, William. Make ... a decent price for the book.

    /Anders
    AndersJensen AndersJensen March 2002 Sales
  • ZX48K boxed + interface-1 + microdrive for saleFree shipping (European buyers only). PayPal.com payment only. The box is in good shape, the pollys are in near mint condition, comes with rf lead, …

    ... -1, microdrive (no cartridges), programing book and software tape (HORIZONS) and ...
    interface1 interface1 March 2002 Sales
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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
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  • European Software Titles with an English version
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