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<1…19202122232425…34>
  • IN 255 behaviour not emulated in Spectaculator and ZXSpinI'm not speaking about "normal" IN 255 behaviour. All of you know what I'm taking about: IN 255 can be used to "read" screen data as it's retrieved f…

    ... from memory by the ULA to draw the screen. ... to detect when the ULA has finished generating the ... contended memory, and the ULA stops the Z80 clock until ... Z80 resumes operation, the ULA has been released the ... the mentioned range, AND the ULA is accessed (A0 = ...
    mcleod_ideafix mcleod_ideafix January 2009 Hardware
  • Dead microdrive advice plsHi, I recently got a box of bits off ebay, and one of the items is a dead microdrive. Now assuming the motor inside it works (I havnt tried putting…

    ... -solder incase I fry the ULA) what are the likely causes ...
    Paul_esx30 Paul_esx30 January 2009 Hardware
  • Help with faulty +2ahi everyone I'm Nuno from Portugal I think I made poopoo with a 128k +2a motherboard I had spare for testing purposes This motherboard has always …

    ... to 48k I think the ULA is working no?
    the ... ula on amstrads is that square ...
    Nuno2009 Nuno2009 January 2009 Hardware
  • Fastest way to clear a screen.We haven't had an optimizing fun for some time, so let's have some: What's the fastest way to clear a screen (i.e., filling the 6912 bytes at 16384 w…

    ... let's ignore the memory contention.

    To start with ...
    Patrik Rak Patrik Rak February 2009 Development
  • R.I.P. spectrum 48kRecently one of my 48k rubber key (issue 4) machine bit the dust the other day when I tried to power it on. When powering it on, it gave a weird 'bee…

    ... Res?arch r$...
    The ULA gets very hot.

    ULA ferranti #7, all new electrolytic ... some custom fit heatsinks for ULA, Z80, etc...
    I seem ...
    thomas3120 thomas3120 February 2009 Hardware
  • SRAM replacement for lower 16KSome time ago I wondered if it were possible to replace the lower 16K RAM of a 16K/48K Spectrum with a single SRAM chip. You know, those pesky 4116 D…

    ... issue 4B (rubber keys)
    [*]ULA inside is of type 6C001E ... case with other issue boards, ULA versions, or SRAM types. Right ...
    RetroTechie RetroTechie 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…

    ...
    There is also the ULA replacement.
    There's DEATH ...
    dekh dekh February 2009 Hardware
  • Yay. Found an issue 1!I've had a Speccy sitting about the house for a while, unused as it only ran as a 16k (a sticker seal on the casing suggested either a 48k upgrade or…

    ... 1 16k (with the little ULA daughterboard).

    Thing is ...
    liveinabin liveinabin March 2009 Hardware
  • +2 datacorder noise eliminationHello :-) I have recently bought a gray +2, and as expected, it is plagued with the "datacorder noise in sound output" problem. I have found a few …

    ... by motor reaching and destroying ULA if the whole datacorder circuitry ... is wired straight into the ULA without any buffering and a ... the possibility of killing the ULA if the voltage applied exceeds ...
    memrah memrah March 2009 Hardware
  • issue 6a faultyHi All I got issue 6a pcb from ebay with status faulty pcb had bad voltages when I power up I changed tr4 ztx650 and all voltages got back on ic6 I h…

    ... 74ls04 (old one working too), ula working fine - I have 2 ...
    gorski gorski March 2009 Hardware
  • Sprinter 2000A while ago I bought the Sprinter 2000 from the now defunct St. Petersburg-based company Piters Plus. It is one of the last five or so of the 120 or …

    ... IDE disk support.
    The ULA is kept inside an FPGA ...
    wilsonsamm wilsonsamm April 2009 Sales
  • interface1discipleanyone manage to virtually connect two emulators running on the same machine? could zx spin be modified to replay two rzx files simultaneously? any o…

    ... an lcd screen - think the ula snow comes thru ?
    Roger Jowett Roger Jowett April 2009 Emulators
  • DRAM without powerSomething interesting I noticed last night, after making a bad Spectranet ROM image which crashed the machine... Looking at the image on the screen,…

    ... ago, csmith noted that the ULA sometimes exceeds the datasheet's ...
    Winston Winston May 2009 Hardware
  • Problem SpeccyNot sure anyone can help without a photo but I'll describe it anyway (and maybe post a photo later). I have a problem speccy. The display shows a bo…

    ... changed out:
    Z80
    ULA
    Rom
    The chip ...
    beanz beanz May 2009 Hardware
  • issue 4s for reapirHi All, This time I have issue 4s for repair :) Here is few screen shots and small movie after boot. [url]http://forest.no-ip.org/issue4s/[/url] I kn…

    ... /[/url]
    I know only ula working fine and have good ...
    gorski gorski June 2009 Hardware
  • How feasible is it to add a second CPU to the ZX Spectrum?Today with IDE, and USB, and TCP/IP and other wonderful technologies arriving on the ZX Spectrum, I'm beginning to wonder if we'll run out of CPU tim…

    ... when neither CPU0 nor the ULA are using it. This ensures ...
    wilsonsamm wilsonsamm June 2009 Hardware
  • Issue One 'Dead Cockroach' chipI recently got hold of an Issue One spectrum, and I started wondering: is the dead cockroach chip required due to a flaw on the PCB, or is it really …

    ... really a flaw in the ULA chip itself?

    Also ...
    trellis trellis July 2009 Hardware
  • 2 new FPGA based clone from russiaFirst of all I wanna introduce you to the [B]ZX Evo[/B] by NedoPC -> [URL="http://www.nedopc.com/zxevo/zxevo.php"]http://www.nedopc.com/zxevo/zxevo.p…

    ... an FPGA instead of an ULA, so you can make it ...
    Shockwav3 Shockwav3 August 2009 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…

    ... various components such as modualtor, ULA, Z80, memory etc.
    ... [CODE]Serial : [xxxxxxxxxxxx] [ colour ]
    ULA : [5C012E 5C112E 6C001E-6 6C001E ... Serial : 001-62176 white
    ULA : 5C102E 8217
    CPU : ...
    Jakeyw Jakeyw August 2009 Sinclair Miscellaneous
  • Where's the border line between a Spectrum and something else?I mean: there are purists out there that consider that anything that is not a true Sinclair Spectrum, with a true Z80 and a true ULA, and at most, 48…

    ... true Z80 and a true ULA, and at most, 48K RAM ...
    mcleod_ideafix mcleod_ideafix August 2009 Development
  • General question about electronics I guess... (128k +2a)[Short question] When I very slightly put my finger on top IC15 on my +2A the TV picture becomes crazy and the spectrum acts if it just resets I don…

    ... is great, ROMS are great, ULA must be good due to ...
    Nuno2009 Nuno2009 August 2009 Hardware
  • RGB to VGA convertor for ZX (clones)[img]http://s44.radikal.ru/i106/0908/1a/28c90d0ca25b.jpg[/img] [img]http://s15.radikal.ru/i188/0908/f2/c1d66b5f6d4f.jpg[/img] It's GOOGLE translatio…

    ... ,HSYNC,VSYNC,+5V,GND,14MHz (ula clock). Output is VGA 50 ... or CSYNC only)
    - faster ULA clock than 14MHz (ZX128 use ... calculate pixel clock from original ula clock):
    [img]http://velesoft ...
    velesoft velesoft August 2009 Hardware
  • 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…

    ... />
    Anyway, is this a ULA problem, if I change the ... to pin 28 of the ULA will I get better performance ...
    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%…

    ... . Power is 100% ok. Swapped ULA, Z80 and ROM for 100 ...
    georgedb georgedb September 2009 Hardware
  • Horror repair story...Today the (new) +3 had a strange issue: keys 6,y,h,n and 8,i,k were not working. Also, the internal drive sometimes was not 'visible' from the Loader…

    ... was near that spot... the ULA!!
    I took my 15x ... inspecting the pins of the ULA...

    I really freaked ... of one side of the ULA were
    loose... WTF! I ... *ck these pins of the ULA were auto-de-soldered ??
    xc8 xc8 September 2009 Hardware
  • Repair options for my own dear old Spectrum 48k?Hello all, This is my first post to this wonderful forum, which is part of a truly great website! My name is Arnold, and I live in Utrecht, The Nethe…

    ... in a working Spectrum). The ULA gets quite hot in the ...
    ZXHistory ZXHistory October 2009 Hardware
  • An idea for a possible(?) new interfaceDue to the Spectrum's processor speed and the way the ULA works, there are a couple things (among others) that are difficult to do: -Gigascreen or a…

    ... speed and the way the ULA works, there are a couple ...
    zxbruno zxbruno October 2009 Hardware
  • First Contact - New Isometric GameIt was about time I did something software-wise! I took a bit of a break from writing the ULA book, and have come up with a new game. Work is very mu…

    ... a break from writing the ULA book, and have come up ...
    csmith csmith October 2009 Development
  • Subacuatic (ZX Spectrum 128k) - MojonTwinsFerdinand W. Templeton is the referential archeologist at the University of Michigan. His important discoveries in such exotic places as Egypt, Phili…

    ... takes advantage of the modified ULA present in the Harlequin clone ... load the game in a ULA-modified Harlequin (when this is ...
    jf_jara jf_jara November 2009 Games
  • Diagnosing Spectrum 48k (faulty RAM chip?)I have a Spectrum 48k (I believe it may be an upgraded 16k model) that doesn't work, and never has ever since the owner gave it to me. When you turn …

    ... the socketed chips (except the ULA, CPU and ROM since they ...
    Muzer Muzer November 2009 Hardware
<1…19202122232425…34>

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