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  • A Spectrum that fixes itselfWell, the modulator on my 128K toastrack machine fixed itself. It used to drift horribly within the first half hour or so of power up, but now it's a…

    ... nice toasty warmth of the ULA, and regular use (I only ...
    Winston Winston June 2007 Hardware
  • Disable onboard memoryWould this work...? Access to onboard I/O can be disabled by holding IORQGE high. Would it be possible to create a MEMRQGE in a similar way to disa…

    ...
    |
    Z80 MEMRQ +----+--/\/\/\/---+------>ULA, top 32K RAM
    | | |
    Jonathan Harston Jonathan Harston June 2007 Hardware
  • ZX Spectrum 128+ problemsHello!I recently purchased and got myself a spectrum 128+ from ebay.The item did not have an original power supply so i got a power supply of 9volts …

    ... output) or a faulty Ferranti ULA chipset?

    Unfortunately spectrum ... from tv.

    If ULA is the problem does anyone ... know if there are replacement ULA chips?I know that ferranti ... .uk/T34VG1-USSR-Made-of-ULA-Chip-for-Z80-CPU-ZX ...
    Msx2 Msx2 July 2007 Hardware
  • Fuse for Mac OS X beta releasesA beta version of Fuse for Mac OS X has been released at the dedicated sourceforge project: [url]http://sourceforge.net/projects/fuse-for-macosx/[/u…

    ... active, as the +2A/+3 ULA applies contention only when MREQ ...
    Fred Fred July 2007 Emulators
  • Home made SinclairsHi, I mentioned in another thread that I had made a ZX Spectrum out of spare parts. If you'd like to see my efforts, I've set up a simple web page o…

    ... anything clever like make the ULA circuit out of 74-series ...
    Phu Phu July 2007 Hardware
  • Poorly Spectrum + Fault diagnosis help needed!Hi, I've got a Spectrum+. Sometime in the past I broke it and sent it off to be fixed. It came back working good as new, but with an issue 2 board i…

    ... are getting excessively hot. The ULA gets a bit toasty, but ... that was normal anyhow. The ULA is a Ferranti 6c001E7.
    gcallard gcallard July 2007 Hardware
  • Spectrum 128K - Needs Your HelpI have a Spectrum 128K (with the external heatsink on the RHS) it is a 1985 Version 6K mainboard, I got it out of the loft the other day and it wont …

    ... RAM chips (soldered) and the ULA is marked 7K010E5.
    Any ...
    Rampack Rampack July 2007 Hardware
  • Another spectrum saved! (almost)I'm feeling rather chuffed* I just mended my spectrum+ unfortunately several keys were dead, and on opening the keyboard up one of the membrane tails…

    ... replace a single chip - faulty ULA
    guesser guesser July 2007 Hardware
  • Spectrum +3 disk drive errorsHello!As i am waiting for the ula chips to fix my spectrum 128+ i received another spectrum +3 i bought from ebay. I changed the drive disk belt as …

    ... i am waiting for the ula chips to fix my spectrum ...
    Msx2 Msx2 July 2007 Hardware
  • Ebay complaintsDoes anybody know how to complain to Ebay about Ebay? They's just scrapped my auction for a ULA chip saying it was an illegal item :lol: So apart f…

    ... scrapped my auction for a ULA chip saying it was an ...
    DEATH DEATH July 2007 Chit chat
  • Spectrum Diagnosis: Purple is not my colour!Hi, I thought the self-fault-finding amongst you might appreciate my learning experience this afternoon in fixing my home-made speccy 48K. Yesterda…

    ... Memory Controller... no seems fine. ULA board... again clean. RAM board ...
    Phu Phu July 2007 Hardware
  • Harlequin ZX Spectrum Clone now 100% compatible!Hi all! The Harlequin ZX Spectrum clone now shows full timing compatibility with the ZX Spectrum! 8-) Both the ULA IO and memory contentions are fa…

    ... ! 8-)

    Both the ULA IO and memory contentions are ...
    csmith csmith July 2007 Hardware
  • Anyone knows how ULAs were designed?Hi I just finished reading a very interesting article about [URL="http://arstechnica.com/articles/culture/a-history-of-the-amiga-part-3.ars"]history…

    ... />
    I'm guessing that ULA is a lot simpler that ...
    Avian Avian August 2007 Hardware
  • So many questions...I'm a regular reader of this forum and everyday I see so many questions people have. Questions regarding technological decisions made in the past. Qu…

    ... the company? How was the ULA designed? Etc., etc.

    georgedb georgedb August 2007 Hardware
  • Contention and floating bus timingHello, I was recently playing a bit with memory contention and floating bus stuff in ZXDS and there is one thing which puzzles me a bit. It is the d…

    ... on 128k) cycles after the ULA has pulled the INTREQ low ... cycle after it happens). The ULA needs to fetch the screen ... on the bus when the ULA reads them, not later, especially ... a real machine but unfortunately ULA in my beloved 48k died ...
    Patrik Rak Patrik Rak September 2007 Emulators
  • I want to build a new, super spectrum ;-)only kidding Andrew :-) my brain's going at a mile a minute at the moment, so I thought I should put some of the ideas down in case one of them is w…

    ... away from obsolete parts, the ULA is the obvious problem.
    ULA and ram I presume..). what ...
    guesser guesser September 2007 Hardware
  • Broken SpectrumsChaps ( & Mrs Death ), I was looking at getting some dynamic ram chips for the next phase of the Harlequin stuff, and I started thinking...... I've…

    ... />
    I've got the ULA off one of them and ...
    csmith csmith October 2007 Hardware
  • Multiface +3The other Multiface topic has reminded me about this... I may still have this lying about somewhere (although +3 i had at the time is long dead and …

    ... long dead and gone from ULA failure)

    I remember ...
    spider spider October 2007 Hardware
  • Ports AccelerationOn ZX48 or 128/+2(grey) is contended and uncontended ports. For example: if you will read 512 bytes sector from IDE device to ZX ram via INI or INIR,…

    ... will contended (slow down by ULA). ULA stop CPU if adress bus ...
    velesoft velesoft October 2007 Hardware
  • ZX Spectrum and (real) B A S I CSometimes ago there was a thread "how spectrum changed your lives". Another thread dealt with "how to copy spectrum screens using basic not using co…

    ... to understand (maybe beside the ULA) and everyone who dealt with ...
    ingo ingo October 2007 Sinclair Miscellaneous
  • ANN: SpecEmu 2.5Oh well, can't say I'm particularly proud of this, but I am bored with it :p So.... New features: * Currah &#181;Speech emulation (with various pla…

    ... CPU speeds upto 50MHz
    * Snow effect emulation
    * Improved debugging ...
    Woody Woody November 2007 Emulators
  • Who has an Issue 1 or Issue 2 Spectrum??Do you have an Issue 1 or 2 Spectrum (ie machines with 5C102E and 5C112E ULA's) ??? I'm doing a lot of research into the ULA and also the reasoning …

    ... machines with 5C102E and 5C112E ULA's) ???

    I'm ... lot of research into the ULA and also the reasoning behind ... free book "The ZX Spectrum ULA".

    One of the ... the RAS line of the ULA _ever_ go high impedance - this ...
    csmith csmith November 2007 Games
  • Who has an Issue 1 or Issue 2 Spectrum??Do you have an Issue 1 or 2 Spectrum (ie machines with 5C102E and 5C112E ULA's) ??? You're help is needed! PLEASE SEE THIS THREAD: [url]http://www.…

    ... machines with 5C102E and 5C112E ULA's) ???

    You're ...
    csmith csmith November 2007 Sinclair Miscellaneous
  • 128 I/O portsIn The Spectrum Hardware Manual there is a small circuit on page 71/72 to allow 128 I/O ports by using IORQ+A7 to override IORQGE, so any I/O access …

    ... with A7=0 prevents the ULA from responding, so freeing ... high, ie, if the ULA is not being selected with ... high to doubly ensure the ULA is not selected. A ... working ULA responds when A0=0, ... and IORQGE=0. A faulty ULA responds when IORQGE=0, ignoring ...
    Jonathan Harston Jonathan Harston November 2007 Hardware
  • The direct bus or indirect one... that is the questionThe Ethernet project continues...and I'm in a quandry. So I've managed to implement enough socket library for the W5100 that socket, bind, listen, a…

    ... loaded a bit by the ULA, which so I believe consists ...
    Winston Winston November 2007 Hardware
  • Pentagon floating bus timingI wanted to take a little break from working on the ZXDS UI yesterday, so I added support for Pentagon timing instead, so I can finally enjoy the lik…

    ... timing. An explanation how the ULA replacement fetches the bytes without ...
    Patrik Rak Patrik Rak November 2007 Emulators
  • Faulty +2 Grey :(Hello everyone... i was trying to fix a +2 grey board the other day, i had it for some time now. It gave a black screen (paper and border) with two …

    ... known working rom, z80 and ULA on it and made no ...
    gtsamour gtsamour November 2007 Hardware
  • Xmas gamesIt`s Christmas time! :razz: Snow, city lights, Santa, Elfs, deers,... and Speccy! There are many [URL="http://www.worldofspectrum.org/infoseek.cg…

    ... Christmas time! :razz:

    Snow, city lights, Santa, Elfs, deers ...
    JuanF. Ramirez JuanF. Ramirez December 2007 Games
  • Where shall I start to look ?I got hold of a faulty 48k, Issue 6. It displays a picture like shown below: [URL]http://www.gjelberg.no/miscpics/speccyfault.jpg[/URL] Some of the…

    ... also tried to swap the ULA with a known working one ...
    Pilsener Pilsener December 2007 Hardware
  • Faulty Spectrum (help requested)I have an issue 6a specci. It's Z80 has the fault m1 line problem (Multiface 128 does not work). So I decided to put in a new Z80 but unfortunately i…

    ... were made with a working ULA and Z80 from another Spectrum ...
    UTom71 UTom71 February 2008 Hardware
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