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Search Again :: Adv Search 1000 results in 0.012s
<1…18192021222324…34>
  • You know how the 128K was faster than the 48K Spectrum?Regarding how the Spectrum 128K ran at 3.54 MHz rather than the 48K's 3.5MHz, was this difference enough to be an advantage? If not, then surely Sinc…

    ... divided by two yields the ULA-interruptible Z80 clock.

    Regards ...
    Matt_B Matt_B September 2006 Hardware
  • You know how the 128K was faster than the 48K Spectrum?Regarding how the Spectrum 128K ran at 3.54 MHz rather than the 48K's 3.5MHz, was this difference enough to be an advantage? If not, then surely Sinc…

    ... clocked a lot faster, the ULA was pretty much tied to ... could have used an 8MHz Z80 and added a control port ...
    JamesD JamesD September 2006 Hardware
  • You know how the 128K was faster than the 48K Spectrum?Regarding how the Spectrum 128K ran at 3.54 MHz rather than the 48K's 3.5MHz, was this difference enough to be an advantage? If not, then surely Sinc…

    ... could have used an 8MHz Z80 and added a control port ... sounds a bit out of ULA's clock range), I'm ...
    Marcelo Marcelo 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…

    ... trivial modifications to the existing ULA.

    * Two atari ... decoded.

    * Add adjustable ULA interrupt so that it could ... could be synced with the ULA interrupt by some mechanism.
    z80's address space. This includes ...
    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 ... br />
    [quote]* Add adjustable ULA interrupt so that it could ... could be synced with the ULA interrupt by some mechanism.[/quote ... 8/16k segment in the z80's address space. This includes ...
    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…

    ... a major rework of the ULA (or would it)? Another option ... to have a 7 MHz Z80, with a 3.5 MHz ...
    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…

    ... a major rework of the ULA (or would it)?[/quote]
    Z80, with a 3.5 MHz ...
    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…

    ... more contention with the z80 which spells more ... /> An optional 2x speed z80 to compensate for the larger ... of the faster grade z80 required. Contention would ... a 2x speed z80 since the z80 would be stopped ... for twice as many cycles during ULA ...
    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…

    ... more contention with the z80 which spells more ... ]An optional 2x speed z80 to compensate for the ... of the faster grade z80 required. Contention would have ... a 2x speed z80 since the z80 would be stopped ... for twice as many cycles during ULA ...
    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…

    ... since it requires a faster ULA, RAM and CPU. Contention ... between the CPU and ULA accesses to RAM when ... to the z80's machine cycles when the ULA may need ... generation where a newer ULA with twice density and ... 's memory access in z80 refresh cycles, which only ...
    Alcoholics Anonymous Alcoholics Anonymous October 2006 Sinclair Miscellaneous
  • Spectrum RAM Paks...This jogged my memory (excuse the pun!!) : [url]http://cgi.ebay.co.uk/CURRAH-32K-RAM-PACK-BOXED-SINCLAIR-ZX-SPECTRUM_W0QQitemZ150057889352QQihZ005QQ…

    ... , like blowing the Z80, destroying RAM/ROM chips, ULA's etc, I ...
    DEATH DEATH November 2006 Sinclair Miscellaneous
  • Dead Spectrum diagnosis and desolderingI have two dead Spectrums - one I'm pretty sure is caused by bad memory, and the other - well, perhaps a bad ROM, perhaps a bad CPU (it gets halfway …

    ... .3mm tip.

    The ULA chip should be based (in ... seen one without a based ULA chip. Possible somebody has been ... , true - but bad RAM, dodgy Z80, dodgy ROM etc can all ...
    DEATH DEATH November 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…

    ... . Possible problems include ROM/RAM/Z80?ULA. Assuming you want them fixed ...
    Lloyd Lloyd December 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 ... wrong way. I think the Z80 is a bit more robust ... (after all, I have a Z80 on some breadboard that I ...
    Winston Winston December 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 ... wrong way. I think the Z80 is a bit more robust ... (after all, I have a Z80 on some breadboard that I ... on the data lines, the Z80 is very prone to getting ... of them than I have ULA chips. The 4116/4164 ...
    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…

    ... problem.

    ROM/RAM/Z80 are all possible faults with ... would do is test the ULA. Then take voltage readings to ... I would then change the Z80 and then the ROM in ...
    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…

    ... other case you may have ULA or Z80 killed (lines from expansion ...
    Sonic Sonic 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…

    ... 've not tried for a ULA yet) are the RAM chips ... 't have any trouble finding Z80 processors - I have three Mostek ... (mostly for use with a Z80-based recording weather station I ... also I have a CMOS Z80 on the way from an ...
    Winston Winston 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…

    ... % likely
    Z80 CPU 40%
    ROM 40%
    ULA 10%
    ULA then checked the voltages present ... voltages are present, change the ULA and test the computer. It ... , the cause being a damaged ULA. Unlikely but possible.

    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 ... be the ULA. The CPU will most likely say Z80 on it ... , the ULA will say Feranti ... from dead Spectrums like the ULA. Blow that and you're ...
    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…

    ... hardware checking tape (ULA, ROM, RAM) inclucing the Z80's M1 line ...
    gtsamour gtsamour December 2006 Hardware
  • When could Speccy have been born?Just a pondering excercise for those that know more about the different types of chips in the Spectrum than I. Whilst browsing the z80 page on wiki …

    ... /> If no cheap RAM, CPU, ULA etc. you simple can not ... with good price/value ratio, Z80 is not mandatory.
    piters piters December 2006 Sinclair Miscellaneous
  • zx81I have one ZX81 computer here at home which was given to me today. I?ve never had a ZX81 before and therefore have know nothing about it :) The thin…

    ... a bad ULA or Memory (maybe even a bad Z80). Since virtually ...
    MikeW MikeW 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…

    ... as well, called the ULA. The ULA is a sea-of-gates ... with a colour framebuffer. The ULA integrates some stuff that could ... market), didn't have a z80 (yes this was a buying ...
    Alcoholics Anonymous Alcoholics Anonymous January 2007 Sinclair Miscellaneous
  • 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…

    ... br /> 8412
    is ula from working sinclair
    < ... br /> I insert ula from not working to working ... : It looks like the Z80 is dead. You could ... chip sitting between the real ULA and the CPU (IC27 ... between the CPU and the ULA, intercepting address lines and ...
    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 ... 128 ) so you can test Z80's M1 line (NMI).
    I replaced the Z80 with a new one, worked ...
    gtsamour gtsamour January 2007 Hardware
  • ZX-Poly platform (a mutiprocessor Spectrum)Hello All May be it would be interestingly for you In the New Year 2007 vacation I wrote the emulator of my platform ZX-Poly (idea since 1994) whic…

    ... just overcome things like the ULA and no hardware sprites and ... tried to write multithreading in Z80 :) it is more interesting than ...
    Raydac Raydac January 2007 Hardware
  • Keyboard Problem?Hey all. I'm Dave I'm in my last year of college before I go to University. I'm in the UK. I got a +2 a while back when I first told my mum and dad…

    ... chips ?1
    Z80 processors ?3
    ULA chips for the 48K ...
    DEATH DEATH February 2007 Hardware
  • I/O contention model questionHi everyone, Sorry for my poor english. Together with a friend we are working on ZX Spectrum 48k implemented in FPGA. We have found bug in the Spect…

    ... ULA_. (because data from Z80 is valid during whole
    ULA this can't be right as Z80 probes ... T2 forward, but the z80 only samples at the end ... t make sense that the ULA causes contention for non- ... existent ULA ports in the $4000 ...
    Alcoholics Anonymous Alcoholics Anonymous February 2007 Development
  • I/O contention model questionHi everyone, Sorry for my poor english. Together with a friend we are working on ZX Spectrum 48k implemented in FPGA. We have found bug in the Spect…

    Hi,
    Spectrum Ula watch the state of A14 & ... be low together, so the Z80 is halted during T2.
    ula starts to read video ram ...
    Mp Mp February 2007 Development
<1…18192021222324…34>

Latest Posts

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