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<1…15161718192021…34>
  • 48k one dead, one dodgyhello everyone. I have 2 48k spectrum +'s (the one with the QL case). Both boards have issue 3B on them near the speaker. The first will power up …

    ... 8322 (looks liek a newer chip).

    to the right ... . Its LM1889N

    The ULA is on a socket

    Only has the ULA on a socket. its has ...
    chammyman chammyman December 2006 Hardware
  • Replacement ROMsSo, I've replaced a couple ROMs in my +3 to be a +3e. I used a couple of 27c256's, which has worked a treat. So if I wanted to replace the ROMs in …

    ... required to activate EPROM (ROM) chip for read:

    /RD ... & A15 = low (that's ULA's /ROMCS ).

    But ...
    piters piters December 2006 Hardware
  • From a book about commodore.."In April 1982, Sinclair released an improved computer called the ZX Spectrum. Compared to the C64, the Spectrum had few technical advantages. It ha…

    ... have incurred (it seems the chip fab was basically free) although ... its own custom chip as well, called the ULA. The ULA is a ... sea-of-gates semi-custom chip where ... Nevertheless the sea-of-gates chip option was an economical alternative ...
    Alcoholics Anonymous Alcoholics Anonymous January 2007 Sinclair Miscellaneous
  • Spectrum Issue two problemI managed to bring back to life a issue two spectrum (at least the power supply cirquit). The screen is now crystal clear (after replacing all the el…

    ... CPU, and most of the ULA [I]should[/I] check.
    chip drawing so much power it ... I replaced the upper-bank chip (was a 32K OKI) with ... it was a lower-bank chip (since the CPU would ... chips with a single 64Kx8 chip which -even wasting 48K- ...
    Marcelo Marcelo January 2007 Hardware
  • Spectrum Issue two problemI managed to bring back to life a issue two spectrum (at least the power supply cirquit). The screen is now crystal clear (after replacing all the el…

    ... completely.
    Add faulty LM1889N chip to the above list (to ... the left of the ULA).
    I now have an ... was only one faulty memory chip in the upper RAM.
    gtsamour gtsamour January 2007 Hardware
  • 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…

    ... badly-named "second ULA", the 40 pin chip sitting between the real ... ULA and the CPU ( ... IC27). This chip comprises the ... between the CPU and the ULA, intercepting address lines and generating ...
    Marcelo Marcelo January 2007 Hardware
  • Blowtorch method of Speccy repairsI just did my first Spectrum repair (and successful at that). It was the Issue 2 spectrum I wrote about a while ago, I just hadn't got around to doin…

    ... performs tests on keyboard, sound, ULA, RAM chips, and ROM mostly ... huh?), one bad upper RAM chip and finally one (the 5 ...
    gtsamour gtsamour January 2007 Hardware
  • Fpga?I visited this page: [url]http://www.fpga.ch/retro/zx.php[/url] and I have no idea what it is. I checked google and wikipedia but I still don't get…

    ... around the edge of the chip. In short, an fpga is ... .

    The spectrum's ULA is a similar idea but ...
    Alcoholics Anonymous Alcoholics Anonymous February 2007 Sinclair Miscellaneous
  • 128k dead, no TV signalI got 128k spectrum (heatsink model) from a friend of mine. He told me that speccy is dead, and he doesn't know what's wrong with it. When I plugged…

    This thread is old now, but tell you what, I didn't notice you saying the ULA was an Amstrad chip, the machine being a Sinclair built 128. This isn't right!
    DEATH DEATH February 2007 Hardware
  • 128k dead, no TV signalI got 128k spectrum (heatsink model) from a friend of mine. He told me that speccy is dead, and he doesn't know what's wrong with it. When I plugged…

    ... sides of PCB (and especially ULA). Visually it?s in perfect ... /> Did Amstrad really have a chip fab to make the ULAs ...
    netomc netomc February 2007 Hardware
  • 128k dead, no TV signalI got 128k spectrum (heatsink model) from a friend of mine. He told me that speccy is dead, and he doesn't know what's wrong with it. When I plugged…

    ... Amstrad really have a chip fab to make the ... over the manufacture. If the chip is interchangeable, it'll ... you've got the wrong ULA in it. I suppose it ... 's possible the two ULA chips are interchangeable but ... about the white grease since ULA's from the grey + ...
    DEATH DEATH February 2007 Hardware
  • 128k dead, no TV signalI got 128k spectrum (heatsink model) from a friend of mine. He told me that speccy is dead, and he doesn't know what's wrong with it. When I plugged…

    ... over the manufacture. If the chip is interchangeable, it'll be ... /> Maybe AMSTRAD has bought Ferranti ULA's and just printed AMSTRAD ... and upper side of AMSTRAD ULA looks intact with no scratches ... new.

    If AMSTARD ULA is dead (and everything else ...
    netomc netomc February 2007 Hardware
  • Zx Spectrum Laptop (again)I've been reading all the old treads about a possible portable speccy. I even found the one about the Speccy Laptop. But it seems there's a lot of ne…

    ... the ULA. You could do all of RAM in a single chip ...
    Winston Winston March 2007 Sinclair Miscellaneous
  • Zx Spectrum Laptop (again)I've been reading all the old treads about a possible portable speccy. I even found the one about the Speccy Laptop. But it seems there's a lot of ne…

    ... RGB, but YUV out from ULA. And even it is not ... ULA does phase change on every second line. Probably no chip on ... again at new, low power ULA... with some attribute-less extra ...
    piters piters March 2007 Sinclair Miscellaneous
  • Zx Spectrum Laptop (again)I've been reading all the old treads about a possible portable speccy. I even found the one about the Speccy Laptop. But it seems there's a lot of ne…

    ... a chip using an FPGA.

    Actually, on inexpensive ULA subsititutes ... clock cycle) could emulate the ULA in a new design Speccy ... heatsink runs cooler than the ULA on a Spectrum, and it ...
    Winston Winston March 2007 Sinclair Miscellaneous
  • Zx Spectrum Laptop (again)I've been reading all the old treads about a possible portable speccy. I even found the one about the Speccy Laptop. But it seems there's a lot of ne…

    ... I/O pins for a ULA replacement - IIRC, all but four ... off Farnell for a 16MHz chip. They can also natively access ... Z80, especially since the Spectrum ULA's port decoding merely consisted ...
    Winston Winston March 2007 Sinclair Miscellaneous
  • DMA interface for ZX Spectrum[url]http://velesoft.speccy.cz/data-gear.htm[/url] This is internal DATA-GEAR interface for any 8-bit computer with Z80CPU. Use Direct Memory Access…

    ... it when both, DMA and ULA (not to mention the CPU ... is good: how will DMA chip know when ULA acesses lower 16K ?
    piters piters March 2007 Hardware
  • DMA interface for ZX Spectrum[url]http://velesoft.speccy.cz/data-gear.htm[/url] This is internal DATA-GEAR interface for any 8-bit computer with Z80CPU. Use Direct Memory Access…

    ... good: how will DMA chip know when ULA acesses lower 16K ?[/QUOTE ... DMA access to contended memory, ULA stopped clock for CPU.
    ula generate WAIT for CPU. DMA ... work on any ULA model. You
    can change ...
    velesoft velesoft March 2007 Hardware
  • Dead Spectrum +Hi all, I've recently dug out my old Spectrum + with the idea of repairing it. When I last looked at it, when I was much younger, I was soldering a …

    ... ) nutshell:

    Change the ULA.

    If no picture ... after modulator swop, recheck the ULA and change TR1/2 (replace ... with BC547) if ULA ok. Change the LM1889 if ... measuring the resistance through the chip to ground. However, I just ...
    DEATH DEATH March 2007 Hardware
  • Dead Spectrum +Hi all, I've recently dug out my old Spectrum + with the idea of repairing it. When I last looked at it, when I was much younger, I was soldering a …

    ...
    I also pull the ULA out because I get the ... being the only non-socketed chip) that it's not ... I'd also remove the chip enable logic for the upper ... impedance state, or perhaps a chip is drawing excessive current, ... all of RAM and the ULA in cases where they' ...
    Winston Winston March 2007 Hardware
  • toasted soeccysHello, ive jsut bought a pair of speccys on ebay (one 16k issue 2 & a prob 48k issue 3) unfortunaly the genius who sold them tried to see if the wor…

    ... you haven't damaged those ULA chips.

    PM me ... ) nutshell:

    Change the ULA.

    If no picture ... after modulator swop, recheck the ULA and change TR1/2 (replace ... measuring the resistance through the chip to ground. However, I just ...
    DEATH DEATH March 2007 Hardware
  • Currah MicroSource emulationIt appears to be impossible to emualte the MicroSource in software on the ZX Spectrum SE as hardware polling is required. The following patch is not …

    ... know what signals the little ULA in the uSource is connected ... would both drive the uSource chip select line and disable the ...
    Marcelo Marcelo March 2007 Emulators
  • toasted soeccysHello, ive jsut bought a pair of speccys on ebay (one 16k issue 2 & a prob 48k issue 3) unfortunaly the genius who sold them tried to see if the wor…

    ... possible using a NAND gate chip and a Flash ROM.
    ULA turns out to be borked ...
    Winston Winston March 2007 Hardware
  • What's the most probable......cause for this on a grey +2? (z80 is excluded) [url]http://img376.imageshack.us/img376/8087/plus2hk9.jpg[/url]

    ... be next? ULA? PCF1306P...?[/QUOTE]

    The PCF chip is basically ... Spectrum, shoved into a single chip. Issue 6 48K boards as ... +2 are sources for that chip. Sometimes it's labelled ZX84 ... standard cell.

    ULA - only sure source is a ...
    DEATH DEATH March 2007 Hardware
  • Whats up wi mi speccy ? M RAMTOP no good 0:3I bought a speccy on ebay tried to load Mission Impossible but about 30 secs into loading it stopped and i got the error message ... M RAMTOP no good…

    ... the Z80, an upper RAM chip has failed at exactly the ... " point", or the chip is completely shagged, bad ULA - the list goes ...
    DEATH DEATH March 2007 Sinclair Miscellaneous
  • Problem with my speccy 48+My machine boots up but apon booting it freezes and you can see feint grey horizontal 1 pixel lines going down the screen. Is this fixable at all?

    ... a thermal fault, could be ULA, Z80, ROM, RAM (etc etc ... is cold, warm up a chip with the tip of your ... 've warmed up the right chip - Replace it. If it acts ... than bombes out), try another chip, after powering down for a ...
    DEATH DEATH March 2007 Hardware
  • Dead +2B, help required...It was bought defective on ebay. It came with two faults: a "dead" power supply (it was the fuse) and a faulty main unit. The power supply is now re…

    ... reading a handwritten note... the chip was a 74HCT273 (I didn ... than the others, and the ULA get noticeably hotter (although I ... possible failure before getting the "ULA dead" death sentence.
    Zup Zup March 2007 Hardware
  • Dead +2B, help required...It was bought defective on ebay. It came with two faults: a "dead" power supply (it was the fuse) and a faulty main unit. The power supply is now re…

    ... the ULA to be warm, generally it's the only chip on ... - and after a while the ULA is pretty toasty. I don ... type in the type of chip (i.e. 74HCT273, presumably '273 ...
    Winston Winston March 2007 Hardware
  • Regarding the interface with USB port[url]http://www.octocom.es/reuniones/art_madridsx07_11.html[/url] [url]http://velesoft.speccy.cz/kmouse/km-doc/kempston_mouse_turbo_interface/km-t_2…

    ... of package did the USB chip come in - I've been ... .

    Basically, lay your chip down on the pre-tinned ... . This is how I resolder ULA chips on a +3/2a ...
    DEATH DEATH 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 …

    ... .[/QUOTE]

    If the ULA is working fine (since you ... than 0.5v, and the chip will not work correctly), then ...
    Winston Winston March 2007 Hardware
<1…15161718192021…34>

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