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<1…16171819202122…34>
  • The new Superfo cloneHi In the spanish forum speccy.org some guys and me have optimized the superfo clon to have less ICs. The actual design has 39 ICs versus the 45 ICs…

    ... the Harlequin, and ULA details from the book and is creating a ... PCB and hopefully the real ULA.

    Doing it with ... a go at reproducing basic ula cells with transistors, so perhaps ... a transistor-only ula next?

    Me, I ...
    csmith csmith April 2012 Hardware
  • The new Superfo cloneHi In the spanish forum speccy.org some guys and me have optimized the superfo clon to have less ICs. The actual design has 39 ICs versus the 45 ICs…

    ... Harlequin, and ULA details from the book and is creating ... PCB and hopefully the real ULA.

    ... go at reproducing basic ula cells with transistors, so ... is unavailable (like the ULA).
    3. The ... connected). The Series 6 ULA more affordable but has ...
    antoniovillena antoniovillena April 2012 Hardware
  • Imperica Horizons - The whole weekend :-)So now it's all over, I'll do a quick writeup... It all started for me at 5.20 am. Getting to London from Devil's Island isn't so easy now that Aer …

    ... our own csmith with his ULA talk. This was excellently presented ... us that already have his book. When's the revised edition ...
    Jakeyw Jakeyw May 2012 Sinclair Miscellaneous
  • Simple explanation of interrupts (in the context of Z80/Speccy)I wondered if somebody on here could explain in simple terms how interrupts work on the Speccy and where interrupts are source from. Are they a natur…

    ... by the user. Any Z80 book can explain this with more ... source of interrupts is the ULA. They are triggered one per ...
    mcleod_ideafix mcleod_ideafix June 2012 Development
  • Simple explanation of interrupts (in the context of Z80/Speccy)I wondered if somebody on here could explain in simple terms how interrupts work on the Speccy and where interrupts are source from. Are they a natur…

    ... by the user. Any Z80 book can explain this with more ... source of interrupts is the ULA. They are triggered one per ...
    takapa takapa June 2012 Development
  • The video circuitryDo you know which electronic parts make up the video circuitry in Spectrum 128k +2?

    ... you know which chip is ULA?[/QUOTE]

    O_o
    ULA". See the Sinclair Spectrum Introductory Book (the red thin book), or ...
    mcleod_ideafix mcleod_ideafix August 2012 Hardware
  • WIP: ULAPlus hardware implementationThis aims to be an "almost" plug-in replacement for the Sinclair ULA chip fitted in Spectrum 16K/48K/Plus machines. It comes in a form of a small PC…

    ... the particularities of how the ULA generates these signals, and three ... read that chapter from Chris' book as deep as the others ...
    mcleod_ideafix mcleod_ideafix August 2012 Hardware
  • WIP: ULAPlus hardware implementationThis aims to be an "almost" plug-in replacement for the Sinclair ULA chip fitted in Spectrum 16K/48K/Plus machines. It comes in a form of a small PC…

    ... ULA+, CPLD version). I stopped work on it to finish the book ...
    csmith csmith August 2012 Hardware
  • WIP: ULAPlus hardware implementationThis aims to be an "almost" plug-in replacement for the Sinclair ULA chip fitted in Spectrum 16K/48K/Plus machines. It comes in a form of a small PC…

    ... ULA+, CPLD version). I stopped work on it to finish the book ...
    mcleod_ideafix mcleod_ideafix August 2012 Hardware
  • Spectrum in black TS1500 case with grey "Sinclair ZX Spectrum" labelAt the Spectrum30 event yesterday, someone had brought a Spectrum like object with an unusual case and I never did find out whose it was or where it …

    ... />
    You should make a book of all your findings, make ... 3 board with 5C112E-2 ULA. SRC 119 burned on board ...
    zxbruno zxbruno September 2012 Hardware
  • semi dead speccy 48k who can helpHi forum , i am busy recovering a 48 k speccy issue 3 board unit. With the help of a more experienced spectrum user from the uk , i managed to get…

    ... on page 181 of his book: /ROMCS=A14+A15. The diagram ... just wishful thinking, and original ULA decoding is simpler...

    [*]Put an ULA in a breadboard, set all ... (preferably repeated for 5Cxx version ULA's)
    [/LIST]
    RetroTechie RetroTechie October 2012 Hardware
  • WIP: ULAPlus hardware implementationThis aims to be an "almost" plug-in replacement for the Sinclair ULA chip fitted in Spectrum 16K/48K/Plus machines. It comes in a form of a small PC…

    ... buy a copy of Chris' book ;) ), the Spectrum generates an out ... composite video output of the ULA replacement board:

    [img ... 'm thinking on providing this ULA with a true PAL progressive ...
    mcleod_ideafix mcleod_ideafix October 2012 Hardware
  • WIP: ULAPlus hardware implementationThis aims to be an "almost" plug-in replacement for the Sinclair ULA chip fitted in Spectrum 16K/48K/Plus machines. It comes in a form of a small PC…

    Slightly off topic, but ULA related...

    Having read ... Radio One roadshow?) about the ULA and some of its idiosyncrasies ... 'The ZX Spectrum ULA: How to Design a Microcomputer' Book. It arrived ...
    1024MAK 1024MAK October 2012 Hardware
  • How far are we from a single-chip 100% ZX Spectrum compatible solution?I really like to read about the projects of some geniusses here on WoS who are working on their ZX Spectrum clones. IMHO some main steps that have b…

    ... done first
    2. The ULA reproduced in CPLD.
    3 ... . The ULA was described in full
    book. Well, single chip plus ram ...
    csmith csmith December 2012 Hardware
  • Rocky Gush Floppy Drive InterfaceI have a Rocky Gush Floppy Drive Interface which I would like to post the details under the Hardware section of the website. What is correct procedur…

    ... zxdesign.info/book/]Chris Smith's book on the Spectrum ULA[/URL] if ... general silicon chip and Ferranti ULA fabrication processes if you want ... the circumstances in which the 'ULA ROM' will be active. ... only ever taken when the 'ULA ROM' is actually being accessed ...
    zub zub April 2013 Hardware
  • Rocky Gush Floppy Drive InterfaceI have a Rocky Gush Floppy Drive Interface which I would like to post the details under the Hardware section of the website. What is correct procedur…

    ... .zxdesign.info/book/]Chris Smith's book on the Spectrum ULA[/URL] if ... general silicon chip and Ferranti ULA fabrication processes if you want ...
    Jmk Jmk April 2013 Hardware
  • SPECTRA - RGB SCART Interface for 48K SpectrumSince the launch of the SPECTRA interface back in June 2012, some discussion of it has appeared in the forums in the past (mainly [URL="http://www.wo…

    ... composite that comes out of ULA. So how can you achieve ... ]

    The 48K Spectrum ULA generates a non standard kind ... 's all explained in Chris' book) changes polarity every other scanline ...
    mcleod_ideafix mcleod_ideafix April 2013 Hardware
  • Barn Find #1Hi, just back from holiday and found a load of spectrum related bits in my folks old barn. They would probably have been a mates who dumped a load of…

    ... /infoseekid.cgi?id=2000357"]this book[/URL] :p[/QUOTE]

    ULA-Design-Microcomputer/dp/0956507107"]this ...
    guesser guesser August 2013 Hardware
  • Repairing a torn trace on an Issue 2 PCBI've found what I think could be the reason for my Issue 2 board not working properly... There is a torn PCB trace beneath one end of where a new ULA…

    ... sockets, just one for the ULA, so my immediate diagnosis would ... />
    Hey, lets start a book on it - what's say ...
    DEATH DEATH August 2013 Hardware
  • ULAs interchangeable across issuesHi all, Now that I'm retired, I'm looking again at 8 bit computing :) I'm attempting to revive a spectrum 48K. I'm going to swap chips in/out from…

    Chris Smith's book has a whole chapter on ULA versions.
    According to the book the transistor modification was still required on the issue 3 ULA and there were some resistor changes on the PCB for the new ULA.
    Basher Basher August 2013 Hardware
  • ULAs interchangeable across issuesHi all, Now that I'm retired, I'm looking again at 8 bit computing :) I'm attempting to revive a spectrum 48K. I'm going to swap chips in/out from…

    ... above require a 6C001E-7 ULA. This is due to timing ... a 5C102/112/6C001E-6 ULA on a Issue 4A and ... the above is csmith's book, pages 250-251.

    balford balford August 2013 Hardware
  • ULAs interchangeable across issuesHi all, Now that I'm retired, I'm looking again at 8 bit computing :) I'm attempting to revive a spectrum 48K. I'm going to swap chips in/out from…

    ... a 5C102/112/6C001E-6 ULA on a Issue 4A and ... -broken ULA !

    Must get my hands on that book .
    DenisM DenisM August 2013 Hardware
  • Border art viewerRecently, we were working with diver/4d on border art. The idea was to push the techniques of drawing on the border to the limit and to see, how much…

    ... of them share the same ULA. So an ULAplus for the ... same timmings as the 48K ULA, which is the implementation I ... going to expect the same ULA with the same timmings as ... how the ULA internals work. Later on, in his book, Chris covered ...
    mcleod_ideafix mcleod_ideafix August 2013 Development
  • ZX Spectrum clock signals comparedI haven't searched for this on WoS; it might have been posted before. But I think it's important info, and can't do any harm to repeat or show from a…

    ... of the driver inside the ULA for the clock output pin ... /> What are the specs for ULA output pins, as in the ... a look at Chris Smiths book, but I am away from ...
    1024MAK 1024MAK September 2013 Hardware
  • ZX Spectrum clock signals comparedI haven't searched for this on WoS; it might have been posted before. But I think it's important info, and can't do any harm to repeat or show from a…

    ... of the driver inside the ULA for the clock output pin ... /> What are the specs for ULA output pins, as in the ... a look at Chris Smiths book, but I am away from ... ]

    I have that book: I SHOULD use it ;)
    bverstee bverstee September 2013 Hardware
  • ZX Spectrum clock signals comparedI haven't searched for this on WoS; it might have been posted before. But I think it's important info, and can't do any harm to repeat or show from a…

    ... copy of "The Spectrum ULA" page 196, this shows ... "collector-follower" in the book) transistor with a 2.1k ... 63, details of the ULA R series peripheral cell are ... dissipation. But as the ULA already runs hot, there ... heatsink is fitted to the ULA ;-)

    [ ...
    1024MAK 1024MAK September 2013 Hardware
  • Spectrum CP/MHello.. Just out of curiosity, has anyone actually used +3 CP/M for any practical purpose? I remember booting it up a couple of times years ago, jus…

    ... .e. whether it is a ULA or fully custom silicon. Nor ... Amstrad according to David Thomas' book
    guesser guesser November 2013 Sinclair Miscellaneous
  • Harlequin clone...PCB manufactured!Using Chris Smith's detailed schematics and project notes from the Harlequin... a Speccy fan in the United States by the name of Don (Superfo) has de…

    ... : [/QUOTE]Don't judge a book by it's cover (and ... ="http://www.zxdesign.info/book/"]buy this book [/URL](I did, if ... does not use a Sinclair ULA, there are a number of ...
    1024MAK 1024MAK December 2013 Hardware
  • ROM replacement using 28C256 EEPROMThought I'd share a quick project I knocked up in order to use a 28C256 EEPROM in place of the standard 23128 ROM in the Spectrum. The connections a…

    ... /> It is believed that the ULA does not include /MREQ in ... 183 of Chris Smith's book, the /ROMCS logic is given ...
    1024MAK 1024MAK December 2013 Hardware
  • Interesting 48K failureI thought I'd recount a failure I've not seen mentioned before that I saw tonight while fixing a 48K issue 6 board. The background: The initial fail…

    ... the ULA contention. I refer interested readers to Chris Smiths excellent book ...
    1024MAK 1024MAK December 2013 Hardware
<1…16171819202122…34>

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