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Search Again :: Adv Search 1000 results in 0.014s
<1…16171819202122…34>
  • On a 48K issue 6A......how can i isolate the 32K block? I want to test if there is any fault on the 4116's , leaving the 4532's out of the equation. Will removing the …

    ... than 0.5v, and the chip will not work correctly), then ... /> Meanwhile i re-swapped rom, ula, logic and mem and measured ... on the z80, rom and ula. Everything is ok.

    odious odious March 2007 Hardware
  • On a 48K issue 6A......how can i isolate the 32K block? I want to test if there is any fault on the 4116's , leaving the 4532's out of the equation. Will removing the …

    ... entire bus back to the ULA and CPU and supporting logic ... , just making a connection across chip pins (and it'll be ...
    Winston Winston March 2007 Hardware
  • Testing RAM Chips After RemovalHi I am going to use Winstons Hot Air Gun method of removing the RAM chips from a 4S circuit board. I wish to check the RAM chips, I have a Logic Pr…

    ... and read values from the chip. This is of course presuming ... uses LEDs so if the ULA is also toast, you can ... hardware to find the bad chip(s).
    Winston Winston April 2007 Hardware
  • Testing RAM Chips After RemovalHi I am going to use Winstons Hot Air Gun method of removing the RAM chips from a 4S circuit board. I wish to check the RAM chips, I have a Logic Pr…

    ... the RAM - but not the ULA since this controls the Z80 ... awkwardness with trying to solder chip sockets on the component side ... if using a 128K flash chip, 32 if using a 512K ... chip). I'm thinking of making ...
    Winston Winston April 2007 Hardware
  • Reading the border colorI am building a snap-button to my ZX-PC Interface. Is there a way to read the bordercolor which is set by an OUT-command. (and please don't tell me …

    ... be as simple as the ULA if you like, and just ... , and to act as a chip enable to read the byte ...
    Winston Winston April 2007 Hardware
  • Reason for strange display layout?I have always wondered if there is any technical reason behind the strange layout of the display file or why did Sinclair choose to do it this way?

    ... the ULA to do it that way (requiring a more expensive chip ... gates as possible in the ULA! I believe the BBC also ...
    Winston Winston April 2007 Development
  • problem with sinclair zx 48 issue 6aHi all, I have the following problem when I turn on my sinclair without rom inserted. [url]http://217.79.64.145/sinclair/5.jpg[/url] when I turn o…

    ... had. One had a bad ULA which I just swapped out ... other had a bad ULA and a memory chip.

    -Have ...
    thomas3120 thomas3120 May 2007 Hardware
  • ULA chipHi. Where i can find a ULA 6C001E-6 chip for an 3B issue Speccy ? Also looking for one 7805 heatsink... Thank

    [QUOTE=BloodBaz;187424]ULA chips are hard to come ... />
    Why do not buy ULA chips form "large" Electronic Components ... do ?quivalents ULA chips with "modern" technologie in CPLD/FPGA chip (?)
    Gods Gods May 2007 Wanted
  • l.e.d question about zx81hi i know this is a spectrum forum but... ive just repaired my zx81 for the 3rd time and was wondering if it was possible to put a led in to show if …

    im fitting a new ULA 2C210E chip tonight i will also try to fit the led.
    4th time ive opened it this month.
    will keep you updated.
    speccy_abuser speccy_abuser May 2007 Hardware
  • Is Ferranti still alive ?And if not......why should there be any restrictions on manufacturing the ULA ?

    ... of RAM, a 128K flash chip (I think that's the ... CPLD to do the memory chip select logic (or even just ... , and an FPGA for the ULA (or perhaps a couple of ...
    Winston Winston May 2007 Sinclair Miscellaneous
  • Is Ferranti still alive ?And if not......why should there be any restrictions on manufacturing the ULA ?

    ... any more, nor is the ULA. The only Speccy components still ... old PROM with a flash chip, the old DRAM with a ... single SRAM, and the ULA with an FPGA (or CPLD ... the rest of the flash chip and remainder of the 64K ...
    Winston Winston May 2007 Sinclair Miscellaneous
  • Is Ferranti still alive ?And if not......why should there be any restrictions on manufacturing the ULA ?

    ... problem seems to be the ULA and the ROM[/QUOTE]
    chip (if they can be found ...
    Alcoholics Anonymous Alcoholics Anonymous May 2007 Sinclair Miscellaneous
  • 48K Speccy not workingHey, A few months ago (hope it&#180;s not to late) I was loading a game into my speccy and from one moment to another it stopped working! I unplugge…

    ... pretty much blow every major chip if you're unlucky.
    ULA and CPU as well. But ...
    Winston Winston May 2007 Hardware
  • ULA chipHi. Where i can find a ULA 6C001E-6 chip for an 3B issue Speccy ? Also looking for one 7805 heatsink... Thank

    ... /> BUT 20 quid for a ULA on rwap, come ON![/QUOTE ... a ULA can be "emuled" by a simple CPLD programable chip, but ... also analog parts in the chip. I don't know, i ... 't find info on Spectrum ULA chips.
    Gods Gods May 2007 Wanted
  • What WAS going to be bundled with Bandersnatch?Just saw a documentary about the death of Imagine ( [url]http://video.google.com/videoplay?docid=-1012096952890708986[/url] ) and apparently they wer…

    ... , with extra memory, a sound chip and a joystick port. I ... of replacing the Spectrum's ULA. Still, even that sort of ...
    Matt_B Matt_B May 2007 Games
  • UlaI remplaced an ULA 6c001-6 by an ULA 6c001-7 chip on issue 3B board. It is "crucial" to remove R32 and adding the 2x NAND gates ??? or not ? Thanks.

    ... =DEATH;197774]Plug in the chip and power up the Speccy ... why Sinclair did all those ULA versions... Still waiting my membrane ...
    Gods Gods June 2007 Hardware
  • How can I tell what issue a speccy is from the serial number?Is it possible to know the issue of a speccy just by looking its serial number? What issue a 001-107603 could be? Is it issue 1 (i know its a 16K ma…

    ... another hard-to-reproduce-custom-chip ?

    Hmmm....it also ... well).

    The custom-chip issue is regarding several brands ... chips like the Spectrum's ULA (and lots of the other ... many ULA's could be fit in a single chip using today ...
    Pilsener Pilsener June 2007 Hardware
  • How can I tell what issue a speccy is from the serial number?Is it possible to know the issue of a speccy just by looking its serial number? What issue a 001-107603 could be? Is it issue 1 (i know its a 16K ma…

    ... the DRAMs. It uses the ULA timning for the lower bank ... the chip.

    It is one of the simpler ULA devices ...
    Phu Phu June 2007 Hardware
  • How can I tell what issue a speccy is from the serial number?Is it possible to know the issue of a speccy just by looking its serial number? What issue a 001-107603 could be? Is it issue 1 (i know its a 16K ma…

    ... lot of the Speccy's ULA is documented in the patents ... said they were implementing the ULA in a CPLD (the little ... logic device, not really a ULA) would be trivial to implement ... the socket that the old chip went. CPLDs are typically PLCC ...
    Winston Winston June 2007 Hardware
  • New Spectrum HardwareHi all. Well its Friday so it seems as good a time as any (business is a bit slack at the moment) to start up a thread about creating new Spectrum ha…

    ... with existing software (including all ULA quirks - in fact, if I ... , I'd just take a ULA / AY chip / Z80 from a Spectrum ...
    gasman gasman June 2007 Hardware
  • New Spectrum HardwareHi all. Well its Friday so it seems as good a time as any (business is a bit slack at the moment) to start up a thread about creating new Spectrum ha…

    ... ) for the ULA to keep chip count down.
    - CP2200 chip for Ethernet ...
    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…

    Refreshing doesn't actually chip select. You can let both ... the /CAS signal from the ULA whenever you're asserting RAMCS ... is asserted you don't chip select the memory on the ...
    Winston Winston June 2007 Hardware
  • My SurplusHere's a list of stuff that I plan to sell. Please let me know if you're interested in any of the items listed below. If you need pictures or more de…

    ... (most likely direct from the ULA) that goes to the modulator ... have the usual ULA, its got a surface mount chip with pins ...
    hldswrth hldswrth June 2007 Sales
  • My SurplusHere's a list of stuff that I plan to sell. Please let me know if you're interested in any of the items listed below. If you need pictures or more de…

    ... have the usual ULA, its got a surface mount chip with pins ...
    Gods Gods June 2007 Sales
  • My SurplusHere's a list of stuff that I plan to sell. Please let me know if you're interested in any of the items listed below. If you need pictures or more de…

    [QUOTE=hldswrth;199335]
    The transistor looks like this, viewed from underneath:
    [code]
    comp signal
    |
    |
    | o
    Gods Gods June 2007 Sales
  • Spectrum ULAHi new to forum ,and have been a speccy owner/fan since the begining{like most 30 somthins on this forum !) Anyway what i want to know is the ULA th…

    ... want to know is the ULA the same from issue 3 ... ]

    Yes! All the ULA chips are interchangeable, with only ... numbers indicate different things. The chip is made in two banks ...
    DEATH DEATH July 2007 Hardware
  • ZX Spectrum 48K +Hi, I have a ZX Spectrum 48K + which I bought like a million years ago (1984) My Spectrum has been out of duty for quite some time and I guess I ke…

    ... ,some transistors inside and 7805 chip.

    b)z80 could ... out of order
    c)ULA chipset may be burnt
    Msx2 Msx2 July 2007 Hardware
  • Does anyone have any working Ferranti's?Does anyone know where I might get hold of a Ferranti ULA5C112E-3?? I think this is the problem with one of my rubber key 48K's as it otherwise wor…

    ... go yellow and the chip gets untouchable:-? This may ... br />
    The ULA getting almost untouchable is pretty ... LM chip although it could also be the ULA. Have ... the LM chip replaced and the ULA checked out fine ... otherwise) just covering the ula's surface (and not ...
    gtsamour gtsamour July 2007 Sales
  • Does anyone have any working Ferranti's?Does anyone know where I might get hold of a Ferranti ULA5C112E-3?? I think this is the problem with one of my rubber key 48K's as it otherwise wor…

    ... problematic LM chip although it could also be the ULA. Have you ... by replacing the ULA.

    The LM chip is very reliable ... track, the LM chip replaced and the ULA checked out fine on ... or otherwise) just covering the ula's surface (and not extending ...
    DEATH DEATH July 2007 Sales
  • Does anyone have any working Ferranti's?Does anyone know where I might get hold of a Ferranti ULA5C112E-3?? I think this is the problem with one of my rubber key 48K's as it otherwise wor…

    ... glue the heatsink on the ULA? Will it stand the heat ... over the centre of the chip, and place a drop of ... top and bottom of the chip though, you only want to ... draw heat out of the chip into the Aluminium plate. Don ...
    DEATH DEATH July 2007 Sales
<1…16171819202122…34>

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