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<1…14151617181920…34>
  • Difference in emulator screen sizes and coloursSeeing as Greencard's gone out drinking... I've done a comparison between Spectaculator and ZXSpin. ZXSpin's full screen with border is taller than S…

    ... 352x296 screen is 4:3.6 . It's not quite fit ... , extremely exact cpu emulation, exact ula emulation, perfect accessory emulation even ...
    Arda Arda December 2008 Emulators
  • Inside the ULAI've recently updated my Blog with the news that I've managed to get inside a 6C001E ULA and have got close up images of the die. I'm currently back-…

    Oh, incidentally, how's the ULA replacement going? I saw that ... long time (I've built 6 Spectranet boards with the syringe ... bit that plugs into the ULA socket, you can get SMD ...
    Winston Winston December 2008 Hardware
  • Analogue BeeperThere's been a discussion on foro.speccy.org about multichannel beeper stuff, and since I had the camera out and the scope set up, I set about demons…

    ... and on (despite what the ULA does), it's actually a ... ,1,18,1,18,1,6,6,6,6,6,6,6,6,1,10,1,20,1 ...
    Winston Winston January 2009 Development
  • 4116 DRAM for 48KSomeone told me I got faulty RAM in my broken 48K. They should be 150ns, right? What would be a good place to buy them from?

    ... a bit the ULA. It came that the ULA I was using ... issue 6A). Replacing the ULA with a -6 model solved the snow ...
    mcleod_ideafix mcleod_ideafix January 2009 Hardware
  • 4116 DRAM for 48KSomeone told me I got faulty RAM in my broken 48K. They should be 150ns, right? What would be a good place to buy them from?

    ... a bit the ULA. It came that the ULA I was ... issue 6A). Replacing the ULA with a -6 model solved the snow ... the snow effect when the ULA had warmed up, and ... away if I let the ULA cool down.

    ... to change the ULA.

    The ULA is designed with ...
    Phu Phu January 2009 Hardware
  • DivIDE on Spectrum +3Hi all, Is it possible to use the DivIDE on the Spectrum +3 in 128K mode? I have the 'A' jumper set on the board, but my +3 resets into 48K mode wit…

    ... ]How will it destroy the ULA?

    The conflict ... RAM). When does the ULA ever drive the data bus ... pages 4,5,6,7) is connect to ULA chip and data ... from ula is connect to ... slow memory page/videoram then ULA return data to ZX ...
    velesoft velesoft February 2009 Hardware
  • DivIDE on Spectrum +3Hi all, Is it possible to use the DivIDE on the Spectrum +3 in 128K mode? I have the 'A' jumper set on the board, but my +3 resets into 48K mode wit…

    ... pages 4,5,6,7) is connect to ULA chip and data ... from ula is connect to ... slow memory page/videoram then ULA return data to ZX ... convinced it'll kill the ULA though, rather, result in ... still RTL like the 48K ULA, or were they using ...
    Winston Winston February 2009 Hardware
  • Component count/modern replacementsThere is a thread/project for replacing the old memory with simms There is also the ULA replacement. There's DEATH's composite replacement. What els…

    ... ]Not sure when the issue 6 pcb was unleashed but it ... for the explanation!
    Issue 6 had a number of standard ... chips replaced by an ULA. IMHO this is not an ...
    roko roko February 2009 Hardware
  • ULA gets so hot, it is cracked open!Hi everyone. I have bought a rubber-keyed 48K and the seller said he was selling it as "for spares/repair." Sure enough, it turns out it doesn't work…

    ... , put a spare ULA of the same type 6C001E in ....[/QUOTE]
    ULA, and using it to check ... ;340148] What might make an ULA get sooo hot that it ...
    roko roko March 2009 Hardware
  • Real 60Hz NTSC 48K ZX SpectrumNot a 3rd party mod. The joystick mod was added by the user, but the board and the computer is exactly what was sold in Chile, South America. We migh…

    ... machine does require a different ULA - one that counts ... 14.110MHz drives the ULA, which divides this by ... : 265 * 312 / (14.110x10^6 / 2) = 60Hz (approx)[/I]< ... and fab costs for a ULA was quite expensive.
    ULA was manufactured between 29th ...
    csmith csmith April 2009 Hardware
  • Skooldaze TooDear WoSsers, Thanks to Skoolkid's disassembly I'm attempting to write a new "improved" version called [B]Skooldaze Too[/B]. As part of the improvem…

    ... /> 5 - Ven conmigo chico
    6 - Date prisa pu?etero
    ?ula de lectura
    ?ula del mapa
    ?ula blanca
    ?ula de ...
    Metalbrain Metalbrain July 2009 Development
  • Spectrum Serial Numbers Wanted!![b]This post updated Sept. 26, 2013[/b] As far as I know, the serial numbering system for the Spectrum has never been fully worked out. For the p…

    ... />
    NUMBER COLOUR MEMORY ISSUE ULA DATECODE Z80 DATECODE COMMENTS
    001-015543 Green 16 1 6C001E 8351 Z80A 8213 no sale ...
    Jakeyw Jakeyw August 2009 Sinclair Miscellaneous
  • Specdrum SyncroI'm having trouble syncing my (revision 4b)48k specdrum. The sync pulses sent out of the MIC socket are low, barely +50db, and isn't powerful enough…

    ... assuming that this is a ULA problem? Anyone able to confirm ... this a board change for 6C001E-7 ULA or something else.
    apprenticemart2 apprenticemart2 September 2009 Hardware
  • Spectrum dead: 8 vertical bars in alternating colorsI have been soldering on this basterd for a long time now. All IC's now have sockets (except the LM1889). I swapped all 4116's by types that are 100%…

    ... out that one connection between ULA-ROM-CPU did not work ... nice clock signal on pin 6 of the CPU and also ... it is close to the ULA, it might be related to ...
    georgedb georgedb September 2009 Hardware
  • Test ROM Cartridge For SaleI'm selling another load of gear including a Sinclair Research Test ROM Cartridge. [url]http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=4000772…

    ... is not flashing then the ULA is almost certainly at fault ... .

    6. The RAM Test.
    The ...
    murtceps murtceps October 2009 Sales
  • AY interface - How many possibilities?Currently the newest AY interface available for sale gives 16K and 48K owners a chance to add AY sound to their Speccy, but (correct me if I'm wrong)…

    ... connector is going from the ULA. As far as I know ... , the ULA uses clock slowdown to stop ... behaviour, which is unacceptable for 6-channel music.

    Of ...
    Shiru Shiru October 2009 Hardware
  • More colours II (Was: Most popular new features?)The suggested 4xCLUT multi-colour solution never took off.

    ... to support a 256-colour ULA under Spectrum +3 CP/M ... driver that maps CP/M 6-bit colour numbers (eg, PALETTE ... />
    (If the Spectrum +3 ULA ever gets reverse-engineered, I ...
    John Elliott John Elliott November 2009 Emulators
  • More colours II (Was: Most popular new features?)The suggested 4xCLUT multi-colour solution never took off.

    ... a natural extention of the ula. A 256x192 mode with a ... methods will go up from 6.75K to 12K of screen ...
    joefish joefish November 2009 Emulators
  • Spectrum 128k +2a questionOn that model what is the purpose of IC 15 ? it is a hex inverter but I cant understant its purpouse I suspect it is malfunctioning in one of my spec…

    ... 5-6) take the 3.5 MHz clock from ULA to Z ... 8.8 MHz clock from ULA to TEA2000 ( pin X1 ) for ...
    Jose_Leandro Jose_Leandro November 2009 Hardware
  • Adjusting your code for screen refreshingOk, I'm aware that I should know it already after writing 5 Spectrum games in machine code but interrupts and screen refreshes were always my weaker …

    ... MASK-INT
    DEC HL ;6 count
    LD A,H ... of Z80 clock by the ULA chip may play a role ... screen, i.c. before the ULA starts
    reading data from ... be
    halted by the ULA chip.[/QUOTE]
    Please note ...
    roko roko November 2009 Development
  • Earliest ULA datecode ??I'm on a mission to find the earliest ULA datecode. Ie, when the first batch of ULA's were manufactured. The earliest picture of the Spectrum circu…

    ... , maybe it was delays in ULA production that caused the initial ... /> [CODE]NUMBER COLOUR MEMORY ISSUE ULA DATECODE Z80 DATECODE COMMENTS
    001-015543 Green 16 1 6C001E 8351 Z80A 8213 no sale ...
    Jakeyw Jakeyw March 2010 Sinclair Miscellaneous
  • Have a real 48k Speccy? yes ? I need your help.Im looking to run this quick test on as many [COLOR="Red"](only)[/COLOR] 48k Spectrums as possible [B][COLOR="Red"]files moved[/COLOR][/B] [URL="ht…

    ... "]Zilog Z80A[/COLOR]
    ULA: [COLOR="red"]6C001E-7[/COLOR]
    BOARD ...
    Richard_Butler Richard_Butler March 2010 Development
  • Codemasters CD Pack CableHi all Does anyone have a spare cable from the the CD game pack codemasters brought out? I got one today but its got the wrong cable with it :( nee…

    ... -down, 3-left, 4-right 6-button, 7-VCC, 8-GND ... directly connect to the ULA ( bye, bye ULA)

    Without GND ...
    Jose_Leandro Jose_Leandro March 2010 Wanted
  • Tricks with IN 31It's generally considered unwise to use a Kempston joystick's fire button to start a game, because the floating bus effect can make arbitrary data ap…

    When the ULA is drawing the borders (top, ... 3 bits (ie. bits 5, 6, and 7). In other words ...
    Arjun Arjun April 2010 Hardware
  • Flicker fixer for ZX 48KHas anyone the schematics for the flicker fixer: [URL]http://8bit.yarek.pl/computer/zx.48/[/URL] Micky

    ... place in issue 5 and 6., but chances are they ... the resistor. Check the ULA is firmly socketed and the ... br /> Take off the ULA again. Take the transistor and ... the test program. The ULA snow shouldn't happen anymore ... resistor that is connected to ULA pin 36.
    [ ...
    mcleod_ideafix mcleod_ideafix April 2010 Hardware
  • Spectrum Serial Numbers Wanted!![b]This post updated Sept. 26, 2013[/b] As far as I know, the serial numbering system for the Spectrum has never been fully worked out. For the p…

    ... the RAS signal from the ULA if you put a -7 ... ULA in previous machine. That's ... get screen breakup as the ULA warms up. The machines that ... do) anyone challenge this report (6C001E-7 ULAs in issue 3b ...
    dickydodds dickydodds May 2010 Sinclair Miscellaneous
  • Spectrum Serial Numbers Wanted!![b]This post updated Sept. 26, 2013[/b] As far as I know, the serial numbering system for the Spectrum has never been fully worked out. For the p…

    ... )
    001-134629 (green writing) ULA -6 version Issue Two
    001 ... )
    D01-327611 (green writing) ULA -6 version Issue 3B
    021 ... -969478 (red writing) ULA -6 version Issue 3s
    021 ... -066351 (red writing) ULA -6 version Issue 3B
    rwap rwap May 2010 Sinclair Miscellaneous
  • ZX 48K issue 4a with ULA 5?I got a ZX 48K PCB. It works but it has a ULA 5. I thought on the issue 4a is a ULA 6 or later. Micky

    AFAIK the ULA's used were version 6... from around the time issue ...
    RetroTechie RetroTechie May 2010 Hardware
  • Ziggy - An emulator for WindowsAfter nearly a year of plugging away on the keyboard it's a proud moment for me to announce the release of Ziggy - an emulator for the Windows (what?…

    ... Spectrum games (I mean not Ula+ but this older approach,that ... to support it just yet. ULA Plus is doing quite well ... .23
    java version "1.6.0_12"
    .net framework 4 ...
    Arjun Arjun May 2010 Emulators
  • damaged spectrum+ (blinking squares)Hi, Sorry for my poor english, but I couldn't find on family forums any remedy for my hardware problem with my first speccy in my life :) I've bought…

    ... of intrusion. If turn on, ULA is warm, not hot, 4116 ... -|........|-13
    5 -|........|-12
    6 -|........|-11
    7 -|........|-10
    treneiro treneiro May 2010 Hardware
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