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<1…17181920212223…34>
  • 48k+ ULA'sI've got three ULA's here that only work in certain boards. Thought I was going nuts, swapping, changing stuff around. But hey, I've got two working …

    ... versions of the Spectrum 48K ULA:

    [LIST]
    ... [*]5C102E: Original ULA, found on Issue 1 and ... CPU in machines containing this ULA (Issue 2 boards).
    ... Chris Smith's excellent book, "The ZX Spectrum ULA".

    < ...
    balford balford March 2014 Hardware
  • LDI questionWhen using LDI (or LDD) is it possible to access the value that is transfered from (HL) to (DE), or does the Z80 use an internal data cache to store …

    ... like the ULA until Chris Smith wrote is fab book.

    BloodBaz BloodBaz March 2014 Development
  • ULA pinsHi I am trying to figure out where on the ULA , among other things, the VYU pins are. I have been reading schematics , but I am really lost when I …

    ... figure out where on the ULA , among other things, the VYU ... good description of how the ULA reads from video ram from ... ="http://www.zxdesign.info/book/"]The ZX Spectrum ULA [I]How To ... explains how (and why) the ULA interfaces with the RAM, and ...
    guesser guesser March 2014 Hardware
  • ULA pinsHi I am trying to figure out where on the ULA , among other things, the VYU pins are. I have been reading schematics , but I am really lost when I …

    The ULA video output pins are pins ... on the ULA and how it works, read the book [URL="http ... ://www.zxdesign.info/book/"]"The ZX Spectrum ULA: How to design ...
    1024MAK 1024MAK March 2014 Hardware
  • ULA pinsHi I am trying to figure out where on the ULA , among other things, the VYU pins are. I have been reading schematics , but I am really lost when I …

    ... ="http://www.zxdesign.info/book/"]The ZX Spectrum ULA [I]How To ... explains how (and why) the ULA interfaces with the RAM, and ...
    ingo ingo March 2014 Hardware
  • ULA pinsHi I am trying to figure out where on the ULA , among other things, the VYU pins are. I have been reading schematics , but I am really lost when I …

    ... will order the book.
    How is the ULA pins numbered , I ...
    micken micken March 2014 Hardware
  • 48k+ ULA'sI've got three ULA's here that only work in certain boards. Thought I was going nuts, swapping, changing stuff around. But hey, I've got two working …

    According to Chris' book though, the 6C001E-6 series ... issue 6A with a 5C112E ULA in it, seemed to work ...
    balford balford March 2014 Hardware
  • 48k+ ULA'sI've got three ULA's here that only work in certain boards. Thought I was going nuts, swapping, changing stuff around. But hey, I've got two working …

    ... six versions of the Spectrum ULA.

    5C102E
    book on the ULA[/URL], it turns ... like the 6C001E-6 ULA? The 5C112E screen matrix ... /> For the changes to ULA I/O port ($FE) reads ... the imperfections of the ULA (non-centred screen, etc ...
    zub zub March 2014 Hardware
  • Why was the Speccy screen displaced?Okay, so maybe this has been discussed before but no idea what search terms to look for. I just watched a YouTube video of someone filiming himself …

    A full explanation of how and why the video timings ended up the way they did for the different ULA revisions is all explained in detail in Chris Smith's book.
    guesser guesser April 2014 Sinclair Miscellaneous
  • Why was the Speccy screen displaced?Okay, so maybe this has been discussed before but no idea what search terms to look for. I just watched a YouTube video of someone filiming himself …

    ... glitch in the 6000 series ULA sync pulse. TVs can cope ... taken from Chris Smith's book. Highly recommended.
    rga24 rga24 May 2014 Sinclair Miscellaneous
  • Yellow issue 4A keyboard madnessNote sure if this is a similar problem to the one CornishManicMiner has, but one of my yellow issue 4A boards is driving me crazy. I had it in variou…

    ... follow the Melbourne House hardware book.

    Just to clarify ... repeated (using different ranges) IC1 (ULA) pin 33 and IC2 (Z80 ...
    schombi schombi May 2014 Hardware
  • Yellow issue 4A keyboard madnessNote sure if this is a similar problem to the one CornishManicMiner has, but one of my yellow issue 4A boards is driving me crazy. I had it in variou…

    ... follow the Melbourne House hardware book.[/QUOTE]Have a look at ... of the circuit to IC1 (ULA) pin 33 is okay. This ... repeated (using different ranges) IC1 (ULA) pin 33 and IC2 (Z80 ...
    1024MAK 1024MAK May 2014 Hardware
  • Spectrum screen layoutSeeing the thread on displacement I was wondering why the spectrum had the stupid screen split into three sections and the addresses for each section…

    ... reading Chris Smith's book, 'The ZX Spectrum ULA: How to Design ... actually broken (see Chris's book, see Chapter 23, Hidden Features ... addressing constraint imposed by the ULA and the DRAM refresh ... cumbersome.

    Chris's book covers the ins and outs ...
    zub zub May 2014 Sinclair Miscellaneous
  • Spectrum screen layoutSeeing the thread on displacement I was wondering why the spectrum had the stupid screen split into three sections and the addresses for each section…

    ... reading Chris Smith's book, 'The ZX Spectrum ULA: How to Design ...
    ASH-II ASH-II May 2014 Sinclair Miscellaneous
  • 48k issue 2I have an issue 2 spectrum 48k and wanted to know if i wanted to change the z80 is ther any fix so i dont have that 1 component hugging the z80 [img…

    ... fix a problem with the ULA. On top of the Z80 ... info in a certain book about Sinclair Spectrum ULA's...

    book, wait until I am using ...
    1024MAK 1024MAK June 2014 Hardware
  • 48k issue 2I have an issue 2 spectrum 48k and wanted to know if i wanted to change the z80 is ther any fix so i dont have that 1 component hugging the z80 [img…

    ... add a link to the book:
    [URL="http://www ... .zxdesign.info/book/theZXSpectrumULA.shtml"]http://www.zxdesign ... .info/book/theZXSpectrumULA.shtml[/URL]
    ... of that transistor in the ULA section of this video:< ...
    Zorn Zorn June 2014 Hardware
  • ZX Spectrum 48K AV IssueOK so I dugout my old 48K Speccy today and decided to AV mod it. I did the mod (pretty easy) but the picture I am getting is this. [url=http://posti…

    ... 's just struck me - the ULA in that machine is a ... Spectrum ULA into a [URL="http://www.zxdesign.info/book/theZXSpectrumULA.shtml"]book ...
    balford balford July 2014 Hardware
  • The ULA6C001E-5...Hi everybody, I have been continuing my Quest for the Holy ULA, and have today taken delivery of a ULA6C001E-5. Now, the -6 was used in Issue 3 boar…

    ... my Quest for the Holy ULA, and have today taken delivery ... Chris Smith's book. You have to match the ULA to the ...
    chev chev August 2014 Hardware
  • The ULA6C001E-5...Hi everybody, I have been continuing my Quest for the Holy ULA, and have today taken delivery of a ULA6C001E-5. Now, the -6 was used in Issue 3 boar…

    Nothing in the book about a 6c001e-5.

    We have another member here somewhere fixing a board with a -5 ULA in it, will be interesting to see if it's behaviour ends up matching your experience!

    B
    balford balford August 2014 Hardware
  • The ULA6C001E-5...Hi everybody, I have been continuing my Quest for the Holy ULA, and have today taken delivery of a ULA6C001E-5. Now, the -6 was used in Issue 3 boar…

    ... =balford;783966]Nothing in the book about a 6c001e-5.
    ULA in it, will be interesting ...
    chev chev August 2014 Hardware
  • The ULA6C001E-5...Hi everybody, I have been continuing my Quest for the Holy ULA, and have today taken delivery of a ULA6C001E-5. Now, the -6 was used in Issue 3 boar…

    ... of Issue Two board and ULA.

    What does ... if you put a 6C ULA in an Issue 2 board ... ULA changed between 5C and 6C ULAs, see Chris Smith's book ... this, you can tell which ULA type an Issue Two board ... made for, even if the ULA has been changed later.
    rga24 rga24 August 2014 Hardware
  • 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…

    The book written by C.Smith goes into detail about the ULA design ... :D

    See [URL="http://www.zxdesign.info/book ... a copy and recommend this book to anyone who wants to ...
    1024MAK 1024MAK October 2014 Hardware
  • Dumping Microdrives (to a PC, not to a skip)Morning/Afternoon/Evening chaps, What do people use for getting their data off a microdrive quickly? I know of at least one project which does it ra…

    ... actually work with your dead ULA, as long as it can ... worth dumping, just "backups" and book type ins I expect.
    ULA can't decode.
    I ...
    guesser guesser October 2014 Sinclair Miscellaneous
  • Non-Ferranti ULA 6C001E-7?Hello! I don't like Iss2 boards that much but after revising one Speccy like that for a friend, the results were so positive that I decided to have …

    ... above require the 6C001E-7 ULA to match improvements in RAS ... />
    Details are in Chris' book, unfortunately I don't have ...
    balford balford December 2014 Hardware
  • Books in ArchiveWhen will the Books be available in the Archive?<br>

    Oh look, the spectrum micro drive book. I have that on the desk in front of me right now. On top of The ZX Spectrum ULA. :)
    That's an impressive library Karingal.
    guesser guesser May 2015 WoS/Forum Issues
  • Understanding contentionI'm trying to understand contention and its implications when some "weird" bus cycles (such as I/O cycles with I/O addresses in the contended memory …

    ... a design fault with the ULA, the ULA I/O contention handler ... details there is a good book on the subject... Ask Mr ...
    1024MAK 1024MAK May 2015 Hardware
  • External Z80 CPUHi Looking for some advice if possible. Many years ago I had a plug-in board for a Spectrum 48k which had a couple of switches, a z80 CPU, and a S…

    ... ://www.zxdesign.info/book/"]The ZX Spectrum ULA[/url] Book is recommended reading ...
    1024MAK 1024MAK August 2015 Hardware
  • Dead SpectrumHello guys, I've just bought a dead Speccy 48k (Rubber Keyboard Issue 3 board). Basically, when powered on it initially appears to boot up ok, but in…

    ... ="http://www.zxdesign.info/book/"]The ZX Spectrum ULA: How to design ... the process of mimicking an ULA with a FPGA device, but ...
    RMartins RMartins August 2015 Hardware
  • Dead SpectrumHello guys, I've just bought a dead Speccy 48k (Rubber Keyboard Issue 3 board). Basically, when powered on it initially appears to boot up ok, but in…

    ... ="http://www.zxdesign.info/book/"]The ZX Spectrum ULA: How to design ... the process of mimicking an ULA with a FPGA device, but ... /ulaReplacementWorks.shtml"]successfully replace a ULA[/url], but I never heard ...
    RMartins RMartins August 2015 Hardware
  • ULA snow effectIt's wintertime, you know. [quote="http://ramsoft.bbk.org.omegahg.com/floatingbus.html"]when the I register falls in the range 0x40-0x7F then the UL…

    ... /> btw, have you tested this ULA behavior (four bright effect):
    book.

    possibly i will ...
    jcgamestoy jcgamestoy September 2015 Development
<1…17181920212223…34>

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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    harriusherbartio on April 21
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