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  • 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
  • How about making a diagnostic program for 128k speccys?Hi guys, I was just chatting with DEATH today about a problem i had with my 128 heatsink spectrum and the need for a 128k speccy diagnostic program …

    ... programs are not suitable for testing a 128k speccy all the ...
    gtsamour gtsamour July 2007 Development
  • 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
  • Collision detectionI understand the basic methods for testing for collisions but I have question about the trickier situation of testing for when shots hit the backgrou…

    ... understand the basic methods for testing for collisions but I have ... about the trickier situation of testing for when shots hit the ... done quickly - currently i'm testing for single bits set or ...
    dmsmith dmsmith July 2007 Development
  • Opus Discovery Testers NeededHi folks, I wondered if anyone on here had access to real Opus hardware ? I've made a few disk images of the disks I have with the great help of Sim…

    ... can't store this. For testing we've stored the image ...
    Andrew Barker Andrew Barker July 2007 MIA/STP/SDP
  • 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
  • +3dos BASIC Headers - Char and Number ArraysHi. I'm almost ready to release the first beta of "3eExplorer" my utility for extracting files from a +3e HDD/CF image. It's actually going quite w…

    ... />
    I'm doing some testing with it and have hit ...
    icabod icabod July 2007 Development
  • Unbelievable...This ebay is for some laptops described as "used". Look at them... The URL is: [URL]http://cgi.ebay.com/lot-of-4-IBM-thinkpad-t21-t22-lenovo-part…

    ... ]
    [*][B][COLOR=red]no testing done [/COLOR][/B]
    [*][B ...
    ewgf ewgf August 2007 Chit chat
  • 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
  • A nice program for designing hardware.I tried a nice program named DipTrace. [URL]http://www.diptrace.com[/URL] It's for drawing schematics and pcb's, and it can also convert the schema…

    ... a free limited version for testing on that page.
    Give ...
    Pilsener Pilsener 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
  • 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
  • Melody Music SeriesBTW, anyone having the Melody Music 1-6 and/or Music Pack 1-2? I wanted to use them when testing 48k music in ZXDS but I have found out only the firs…

    ... wanted to use them when testing 48k music in ZXDS but ...
    Patrik Rak Patrik Rak October 2007 MIA/STP/SDP
  • Testing the Ram on a Toastrack 128KHi All My "new" 128K is misbehaving, all the demos I have loaded for it crash instantly, Ghostbusters 128K is playable but one of the background scr…

    Hi All

    My "new" 128K is misbehaving, all the demos I have loaded for it crash instantly, Ghostbusters 128K is playable but one of the background screens has a bar of rubbish across it. This sounds like a problem with the memory, is there an ...
    Womble Womble 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
  • speccy plus keyboard helppicked up a really clean boxed speccy + with a ton of games for ?4 from the local recycle centre yesterday, woohoo :) Anyhow on testing it powers up …

    ... yesterday, woohoo :)
    Anyhow on testing it powers up but the ...
    Heatsink128 Heatsink128 November 2007 Hardware
  • 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
  • Spectrum ethernet... step 1.1Yeah, a tenth of a step :-) Here's the W5100 board up and WORKING: [url]http://www.alioth.net/tmp/w5100-online.jpg[/url] This is called the "Get Th…

    ... being all wrong. I'm testing the board using my ALIAC ...
    Winston Winston November 2007 Hardware
  • 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
  • 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
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