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<1…18192021222324…34>
  • Z80 CPUs goin cheap.This guy is selling them very cheaply and has a couple multi item auctions for them. Thought I would post here in case people were looking for one/so…

    ... available either, I know the ULA isnt available new anymore. Winston ... he says.

    The Chip Farnell sell is a: Z80BCPU ...
    DEATH DEATH October 2007 Sales
  • Any '81 buffs?Does anybody know the running clock frequency of a Z80A in a ZX81? I've measured the clock signal on pin 6 and got 6.47MHz, and I'm sure it's not ju…

    ... PDF[/URL] for the TS1000, ULA's pin 14 (through transistor ... />
    To check if the ULA's really dead (bar the ... other F/F in the chip (not used) to GND or ...
    Marcelo Marcelo October 2007 Hardware
  • Multiface 128Hi Would it be possible to convert a Multiface 128 to use with a Spectrum +3. With a piggyback ROM and switch to enable and dissable the different …

    The MF3 uses a PAL ULA type chip, as does the +D. It ...
    DEATH DEATH 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 ... /> If it's the PAL chip, you'll need either somebody ... and let you have the chip out of it. You could ...
    DEATH DEATH October 2007 Hardware
  • MULTITECH pictures[url]http://velesoft.speccy.cz/data-gear.htm[/url]

    ... ) worked only with german DMA chip UA858B (used in MB02). Last ... natural due to +3's ULA contention. Don't know...
    omega omega October 2007 Hardware
  • MULTITECH pictures[url]http://velesoft.speccy.cz/data-gear.htm[/url]

    ... ) worked only with german DMA chip UA858B (used in MB02). Last ... natural due to +3's ULA contention. Don't know...
    velesoft velesoft October 2007 Hardware
  • MULTITECH pictures[url]http://velesoft.speccy.cz/data-gear.htm[/url]

    ... CPU and ULA generate stable CLK 3.5xMHz. DMA chip must be ...
    velesoft velesoft October 2007 Hardware
  • MULTITECH pictures[url]http://velesoft.speccy.cz/data-gear.htm[/url]

    ... CPU and ULA generate stable CLK 3.5xMHz. DMA chip must be ...
    LaesQ LaesQ October 2007 Hardware
  • Interface rom - Need help to dump itHi, I have temporarily an interface that is similar to a multiface. It has an NMI button and displays a menu where states can be saved and pokes ent…

    ... bit drastic, is it the ULA that blows?
    I cant ... it? well, the ULA is a very hardy chip and it's ... actually, I'd change the ULA because it's the easiest ...
    DEATH DEATH October 2007 Hardware
  • Interface rom - Need help to dump itHi, I have temporarily an interface that is similar to a multiface. It has an NMI button and displays a menu where states can be saved and pokes ent…

    ... it? well, the ULA is a very hardy chip and it's ... actually, I'd change the ULA because it's the easiest ...
    odious odious October 2007 Hardware
  • Input/Output on Edge ConnectorI would like to sense a pulse on the data bus via the edge connector, i.e. on or off. How do you decide what port it is on? I would also like to send…

    ... - for instance the Spectrum's ULA only looks for A0 being ... logic 0 (so the ULA responds to every single even ... you need is a single chip to decode the port address ... , not IN instructions). The other chip, U4, is a flip flop ...
    Winston Winston October 2007 Hardware
  • Look what I got!Look what I just got in the post: [url]http://www.alioth.net/tmp/W5100.jpg[/url] But, please... don't hold your breath :-) Coming to an edge connec…

    ... Winston,

    Ok, this chip looks good, but I'm ... has been generated by the ULA or another source (W5100).
    ULA doesn't put a byte ... determine if it's a ULA generated INT or CTC ... and bit 0 could represent ULA and bit 1 the CTC ...
    LaesQ LaesQ October 2007 Hardware
  • What was a Z80 computer capable of ?I have always wondered, and maybe the techy people on here could answer, with what you know about the Z80 processor, was the spectrum hampered by the…

    ... computer with no dedicated graphics chip, ie the spectrum, with the ... work.[/QUOTE]

    The ULA does the graphics in the ...
    Quazar Quazar November 2007 Hardware
  • FPGA Spectrum is aliveMy FPGA Spectrum that I started to work on year ago is in 90% ready. I have fixed DDR controller so I can read from it and write to it. I've run som…

    ... /> 3. All glue logic and ULA imitation implemented in FPGA (Spartan ... built on board 64MB DDR chip is used. DDR controller is ...
    brian-82 brian-82 November 2007 Development
  • 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 …

    ... working rom, z80 and ULA on it and made no ... all memory chips and installed chip beses (I bought five ... /> Also i installed one chip base to a working +2 ... could be a memory controller chip so there is not ... problem and cleaned the ROM chip pins which where very ...
    Martin Baugh Martin Baugh November 2007 Hardware
  • 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 …

    ... was desoldering the AMSTRAD 40058 chip from both +2 boards this ... ).
    After that, I installed chip bases and swaped the chips ... , loading, etc).
    So the chip to blame was the AMSTRAD ... could trade you an Amstrad ULA, or other things you might ...
    gtsamour gtsamour November 2007 Hardware
  • Composite Video output problemHi everyone, I?ve got a problem that?s really bugging me. I have one Spectrum 48K and one Spectrum +3, both with Composite Video output modification…

    ... to see if the LM1889 chip looks like its had its ... 18-pin chip fairly close to the modulator and the ULA.
    chip. This is the PAL (ish ...
    Phu Phu December 2007 Hardware
  • Composite Video output problemHi everyone, I?ve got a problem that?s really bugging me. I have one Spectrum 48K and one Spectrum +3, both with Composite Video output modification…

    ... to see if the LM1889 chip looks like its had its ... 18-pin chip fairly close to the modulator and the ULA.
    chip. This is the PAL (ish ...
    Johan Johan December 2007 Hardware
  • another c64 vs. Speccy site...[url]http://c64vsspectrum.com/[/url] 25 years and we are still brawling.. ;)

    ... . Sinclair's custom ic (the ULA) is a sea-of-gates ... former being a pre-fabricated chip whose last metallization layer(s ...
    Alcoholics Anonymous Alcoholics Anonymous December 2007 Games
  • another c64 vs. Speccy site...[url]http://c64vsspectrum.com/[/url] 25 years and we are still brawling.. ;)

    ... . Sinclair's custom ic (the ULA) is a sea-of-gates ... former being a pre-fabricated chip whose last metallization layer(s ...
    Dwayne Dibley Dwayne Dibley December 2007 Games
  • another c64 vs. Speccy site...[url]http://c64vsspectrum.com/[/url] 25 years and we are still brawling.. ;)

    ... talking about [B]minimal[/B] ULA improvement only, not something demanding ... registers squeezed onto the same chip.

    [QUOTE=Winston;236113 ... 8 times faster, and the ULA would need to run 8 ...
    TVzombie TVzombie January 2008 Games
  • another c64 vs. Speccy site...[url]http://c64vsspectrum.com/[/url] 25 years and we are still brawling.. ;)

    ... talking about [B]minimal[/B] ULA improvement only, not something demanding ... registers squeezed onto the same chip.[/quote]

    i'll ... issues raised regarding rejigging the ULA lost me a bit... i ...
    TMR TMR January 2008 Games
  • DRAM (:baffled:)Hi, Can someone explain to me the definitive rules on DRAM access times in terms of suitability for a particular speed of processor? Specifically, …

    ... have a 32Kx8 SRAM cache chip just sitting there dying to ... /> However, aiming for a "perfect" ULA timing, I intend to use ... an actual speccy ULA, which likes to output switched ... shoving in a modern DRAM chip.

    -- Richard
    Phu Phu January 2008 Hardware
  • DRAM (:baffled:)Hi, Can someone explain to me the definitive rules on DRAM access times in terms of suitability for a particular speed of processor? Specifically, …

    ... ]However, aiming for a "perfect" ULA timing, I intend to use ... an actual speccy ULA, which likes to output switched ... shoving in a modern DRAM chip.[/QUOTE]

    In which ... . Note that the Spectrum's ULA actually exceeds the maximum refresh ...
    Winston Winston January 2008 Hardware
  • DRAM (:baffled:)Hi, Can someone explain to me the definitive rules on DRAM access times in terms of suitability for a particular speed of processor? Specifically, …

    ... RAM with one 32K SRAM chip.
    Upper was piece of ... (what is DRAM because of ULA) made some problems, so I ...
    piters piters January 2008 Hardware
  • Can anyone help?My brother gave me his +2A but it seems to be knackered. It powers up okay but theres always a few flashing boxes on the screen, plus when you try t…

    I reckon it might be the ULA that's buggered. I understand it'd be easier to replace the whole thing than the chip if it is.

    Hopefully somebody'll tell us I'm completely wrong and that it's something easy to fix.
    natxcross natxcross April 2008 Chit chat
  • Spectrum ULA replacement!Hi gang.. The Speccy 48 ULA Replacement is *almost* here ;) There has been lots of activity in building the CPLD board, sorting out some irritating…

    ... differences between 128k ula and 48k ula(?).[/QUOTE]
    128K ULA has RGB ... video output and 48K ULA is YUV video output. If ... one 48k ULA replacement exist it will be ... must use one PAL encoder chip like the TEA2000 on +2 ...
    Gods Gods April 2008 Hardware
  • Spectrum ULA replacement!Hi gang.. The Speccy 48 ULA Replacement is *almost* here ;) There has been lots of activity in building the CPLD board, sorting out some irritating…

    ... RGB video output and 48K ULA is YUV video output. If ... one 48k ULA replacement exist it will be ... chip like the TEA2000 on +2/+3 board.[/QUOTE]
    There ULA ...
    csmith csmith April 2008 Hardware
  • Speccy LaptopHi, Since my subtle announcement in another thread was underwhelmingly too subtle, I'll repost it in a new thread ;) I have started work designing…

    ... this (taking an original Speccy ULA and pimping up everything around ... ' clone route of recreating the ULA) so I'm glad to ... the RAM to a single chip will cut out a good ...
    gasman gasman April 2008 Hardware
  • Issue 1 ZX Spectrum for SaleBefore I go down the route of shoving this on ebay, I would like to offer fellow WoSsers the opportunity to express their interest in this item. It …

    ... the spider for the ULA (as a chip rather than a circuit ...
    rwap rwap April 2008 Sales
<1…18192021222324…34>

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