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<1…14151617181920…34>
  • InterruptsCan someone help with providing some info or a link about IM 2. I know I need to create a vector table and want to store this as high in memory as po…

    ... />
    On the Spectrum, the ULA is not an im2 aware ... bus and this fools the ula into thinking there is a ... AMX mouse contains a PIO chip which uses two im2 vectors ... MB02 interface contains a DMA chip which can also use the ...
    Alcoholics Anonymous Alcoholics Anonymous February 2005 Development
  • Spectrum IDE port addressesWith eight standard IDE ports to address and with the common access to information via the internet I would have thought that Spectrum IDE add-on har…

    ... ). Bit 7 also blocks 8255 chip in Didaktik Gama clone.
    ULA (#FE port which is implemented ...
    baze baze July 2005 Development
  • Help with dead Spectrum +2aHello. My Spectrum +2a died some time ago. It was powered on, I looked away and next time I looked at it, screen was black. I have replaced the 4 r…

    ... somewhere, usually a RAM chip, which is lowering the ... commonly), thus preventing the ULA or anything else from ... you tried with a different ULA? Remember, don't ... problems - put your suspect ULA into a good Speccy ... video source means your ULA isn't working or ...
    Spirantho Spirantho July 2005 Sinclair Miscellaneous
  • Help with dead Spectrum +2aHello. My Spectrum +2a died some time ago. It was powered on, I looked away and next time I looked at it, screen was black. I have replaced the 4 r…

    ... somewhere, usually a RAM chip, which is lowering the ... commonly), thus preventing the ULA or anything else from ... problems - put your suspect ULA into a good Speccy ...
    How do I change ULA on +2a?

    ... video source means your ULA isn't working or ...
    Timppa Timppa July 2005 Sinclair Miscellaneous
  • Help with dead Spectrum +2aHello. My Spectrum +2a died some time ago. It was powered on, I looked away and next time I looked at it, screen was black. I have replaced the 4 r…

    ... />
    How do I change ULA on +2a?
    [/quote]
    ULA is just a chip on the board but ... at the datasheet for this chip ([url]www.secarica.ro/tea2000 ... and power lines on the chip. You should have +0V on ...
    Spirantho Spirantho July 2005 Sinclair Miscellaneous
  • Help with dead Spectrum +2aHello. My Spectrum +2a died some time ago. It was powered on, I looked away and next time I looked at it, screen was black. I have replaced the 4 r…

    ... . I assume the ULA is just a chip on the board but ... .
    [/quote]

    The ULA on a +2a, is (going ...
    dasteph dasteph July 2005 Sinclair Miscellaneous
  • Help with dead Spectrum +2aHello. My Spectrum +2a died some time ago. It was powered on, I looked away and next time I looked at it, screen was black. I have replaced the 4 r…

    ... 25, dasteph wrote:
    The ULA on a +2a, is (going ... [I]is[/I] the ULA before replacing it... and that ... a low profile surface mount chip in a DIP 14 socket ... on it! If the ULA is dead I suspect you ... hope it's not your ULA!

    _________________
    ...
    Spirantho Spirantho July 2005 Sinclair Miscellaneous
  • Help with +3 in comaHi everyone Had a spectrum +3 under the bed for some time and when replacing its drive i accidentally connected the 5v and the gnd of the led. Now…

    ... electronics) is that the TEA chip gets hot immediately after powering ... hope that its not the ULA that is behind all this ... post about soldering a new ula and i could give it ... my hands on a +3 ula somehow or is there a ...
    odious odious August 2005 Sinclair Miscellaneous
  • ZX-81 Ram Pack problemHi! I know this is a ZX Spectrum forum, but I am hoping someone here might be able to help me out... I have posted this to c.s.s. but noone was able…

    ... my ZX81. It seems the ULA in the ZX81 might not ... and not really a broken ULA) - so it might work with ... . OR - the ULA in the RamPack (or the 74LS156 chip) might be ...
    Tom-Cat Tom-Cat September 2005 Sinclair Miscellaneous
  • Hardware pics wantedWe're looking for real life photographs of all hardware items and their packaging (if nice). There are many items I've never seen and I assume that w…

    ... to replace the ULA? It's about the only chip you can ... how to re-design the ULA! Would be cool to see ...
    DEATH DEATH November 2005 Hardware
  • Sound mod for AY audio chipsHi again. This is a repost. I posted it in the misc forum a while back but it definitely should be in here. I was totally pissed off with the crap…

    ... see its also a DIL chip. Would I be correct in ... +2 all share the same ULA?
    _________________
    There is ...
    KeepGood KeepGood December 2005 Hardware
  • When is a clone not a clone?If a Spectrum is built from scratch, using new components where available, is it a clone, copy or something else? See, I won an unpopulated Spectrum…

    ... 2 chips, 32 to 1 chip SRAM, dropped out PAL encoder ... with different components, self made ULA in first place.
    piters piters May 2006 Hardware
  • When is a clone not a clone?If a Spectrum is built from scratch, using new components where available, is it a clone, copy or something else? See, I won an unpopulated Spectrum…

    ... uses the standard Issue 6 ULA, but is built on an ... does not use the 4164 chip "as is".

    Fancy ...
    DEATH DEATH May 2006 Hardware
  • Is there any Sinclair world cup anthem?I've just been listening to a few World cup anthems past and present, but what I really need is a World Cup anthem that mentions any of the sinclair …

    ... />
    The General Instruments AY chip that spawned a
    Whole ...
    Screen mem on the ULA
    Z80 machine code, better ...
    Where's that AY chip gone... Where's that AY chip gone... May 2006 Chit chat
  • ANN: SP1 for Z88DK (aka splib3, Sprite Pack v3.0)Well it's finally arrived, after a month of "a few days from now" release deadlines. SP1 is the lastest version of splib, a flicker-free software sp…

    ... />
    On the Spectrum, the ULA generates a maskable interrupt at ... :
    [LIST]
    [*] The AY chip needs to be updated at ... are not straightforward however. The ULA was not designed to work ... 255), (I*256+256) the ULA interrupt will cause our subroutine ...
    Alcoholics Anonymous Alcoholics Anonymous May 2006 Development
  • new spectrumI have notices all sorts of advances on the C64 sceene such as 20mhz cpus, gui`s, and IDE interfaces. are they any kind of advances in development fo…

    ... a rather large and expensive chip to get any quantity of ... things previously done by the ULA, all the reconfiguration stuff, plus ...
    Laser Laser June 2006 Hardware
  • new spectrumI have notices all sorts of advances on the C64 sceene such as 20mhz cpus, gui`s, and IDE interfaces. are they any kind of advances in development fo…

    ... 27K visable by the ULA instead of the usual 6 ... joystick port, AY sound chip (on 128 and Timex ports ... you describe. An AY chip clone is moderately easy too ... towards "System on a Chip" with their NIOS processor ... sucked into the main chip (£25 buys a reasonable ...
    Laser Laser June 2006 Hardware
  • What could Sinclair have doneI know that he lost interest in home computers, but Sinclair as a computer company could have had a longer life span than it did, the move from 8 bit…

    It is old theme...

    Lets say: he didn't move production to Asia. He didn't built chip factory, but used ULA chips.

    For me, major flip was unergonomic keyboard at Sp. + and followers :-)
    piters piters July 2006 Sinclair Miscellaneous
  • Spectrum 128+2Greetings to all My Speccy Tape Drive has died. Fully blown :( Is there any way to hook up a external cassete player to the +2? I can't see any "lin…

    ... visa versa) will fry the ULA/Gate Array chip.
    DEATH DEATH August 2006 Hardware
  • Questions from the new owner of a grey Spectrum +2I managed to pick up a grey Spectrum +2 off of ebay with cheap shipping (I'm in the US... it was $13 total and it has a Donkey Kong tape inside) and …

    ... uses a single 32K ROM chip). The black +2 is basically ... bank switching that the newer ULA provides.

    Is there ... or you can fry the ULA.[/QUOTE]
    Yeah, I read ...
    JamesD JamesD September 2006 Hardware
  • Spectrum won't load data when warmI've got an interesting observation. I put iPodLinux onto my iPod and got TZX files playing back as the proper audio waveform. I also removed the vol…

    ... ]

    btw, is the ULA from a 128K machine the ... ]



    The ULA in the 48K machine is ... />
    The 48K ULA is a 40 pin chip, whilst the +2 ... ULA has more, so that ...
    DEATH DEATH September 2006 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…

    Only place for a spare ULA is another broken Spectrum.
    < ... /> It is unlikely that the ULA is killing the video so ... - maybe it's the encoder chip (TEA2000) - well, I think the ... TEA chip is used inside the 128 ...
    DEATH DEATH September 2006 Hardware
  • The 128 plus 2 wasn't very goodHaving looked at the review in issue 33 of Crash of the Spectrum Plus 2, it strikes me as a bit odd, as if Simon Goodwin had to like it. I remember r…

    ... ULA.

    * Two atari compatible joystick connectors, the AY chip ... .

    * Add adjustable ULA interrupt so that it could ... could be synced with the ULA interrupt by some mechanism.< ... modified to support the AY chip and attach streams for ...
    Alcoholics Anonymous Alcoholics Anonymous October 2006 Sinclair Miscellaneous
  • The 128 plus 2 wasn't very goodHaving looked at the review in issue 33 of Crash of the Spectrum Plus 2, it strikes me as a bit odd, as if Simon Goodwin had to like it. I remember r…

    ... trivial modifications to the existing ULA.
    [/quote]
    We ... compatible joystick connectors, the AY chip was ok too, nicer ... />
    [quote]* Add adjustable ULA interrupt so that it could ... could be synced with the ULA interrupt by some mechanism.[/ ...
    JamesD JamesD October 2006 Sinclair Miscellaneous
  • The 128 plus 2 wasn't very goodHaving looked at the review in issue 33 of Crash of the Spectrum Plus 2, it strikes me as a bit odd, as if Simon Goodwin had to like it. I remember r…

    ... included some sort of blitter chip to the 128 / +2 and ... a major rework of the ULA (or would it)? Another option ...
    monty.mole monty.mole October 2006 Sinclair Miscellaneous
  • The 128 plus 2 wasn't very goodHaving looked at the review in issue 33 of Crash of the Spectrum Plus 2, it strikes me as a bit odd, as if Simon Goodwin had to like it. I remember r…

    ... included some sort of blitter chip to the 128 / +2 and ... a major rework of the ULA (or would it)?[/quote]
    JamesD JamesD October 2006 Sinclair Miscellaneous
  • KEYBOARD PROJECTYes I know this should be in the hardware section (sorry), but just recently there was supposed to be some dude making a new keyboard interface. If y…

    ... state. Outputs via diodes on ULA KBD pins. (better would be ... squize all it in one chip. Or it is done already ...
    piters piters October 2006 Hardware
  • Speccy dead? :-(I've been playing around with my Speccy and a Discovery disc drive unit, and tried to do the NMI modification to allow a multiface to be plugged into…

    ... />
    It seems like the ULA is extremely fragile, and will ... may be a moe hardy chip, but I've binned far ... of them than I have ULA chips. The 4116/4164 RAM ...
    DEATH DEATH December 2006 Hardware
  • Nooooo my speccy died!??!!Hi! I am quite sad. :( Tonight I got a kempston interface so I rushed home to try it on my spectrum+ The edge connector of the interface was narrower…

    ... %
    ROM 40%
    ULA 10%

    I ... them, always changed the ULA then checked the voltages ... are present, change the ULA and test the computer. ... the cause being a damaged ULA. Unlikely but possible.
    ... ? then check each 4116 chip in turn. If you ...
    DEATH DEATH December 2006 Hardware
  • 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 …

    ... chips that are based are ULA chips, not CPU. It's ... 've explained it, the only chip to be based on both ... would have to be the ULA. The CPU will most likely ... say Z80 on it, the ULA will say Feranti on it ... from dead Spectrums like the ULA. Blow that and you're ...
    DEATH DEATH December 2006 Hardware
<1…14151617181920…34>

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