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  • 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…

    ... to field interrupts from the ULA:

    [code]
    z80 in im2 mode. This ... , on interrupt, the z80 will always jump to the ... ULA interrupts and supplies a random peripheral id to the z80. The z80 ... 0xd4 bytes, the z80 will read 0xd4d4 as ...
    Alcoholics Anonymous Alcoholics Anonymous May 2006 Development
  • Faulty 128KI digged out my Spectrum 128, and it wakes not up. I don't have experience, only with 48K. Maybe someone can give me some hint, clue. It looks like m…

    If not the ULA, it's most likely to be RAM/Z80. You's be surprised at how often the Z80 goes down.

    You can do basic voltage checks to see if all the voltages are present, that may be a start....
    DEATH DEATH 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…

    ... sense to plug a modern Z80 into the board than use ... options), 27K visable by the ULA instead of the usual 6 ... SE called for a 100MHz Z80 clone or something, but if ... a suitable real Z80 is available it would be ...
    Laser Laser June 2006 Hardware
  • The New SPIN releases ThreadOk, as I'm now working on SPIN again full-time, and as a very wise man once said, "Release Early, Release Often"[1]... I'm going to release new SPIN…

    ... is still supplied by the ULA, contrary to bit 7 of ... manufacturers, and does vary with temperature after switching on, but executing ...
    Woody Woody July 2006 Emulators
  • RealXThis may be a dumb question but will RealX ever get released?

    ... a good understanding of how ULA snow really works. And ... 0x40-0x7F then the ULA gets confused by the ... memory refresh cycles of the Z80 (performed during each instruction ... that the address the ULA uses to build up ... A8 = A15-A8 of the ULA address
    A7-A0 = ...
    Dunny Dunny July 2006 Emulators
  • RealXThis may be a dumb question but will RealX ever get released?

    ... for determining where the ULA reads display/attr bytes ... We only studied the 128K ULA directly, not the 48K one ... address lines of the ULA's private bus are ... ) is applied when the Z80 starts a memory cycle at ... is to know about the ULA!
    [/QUOTE]
    ...
    Luca Luca July 2006 Emulators
  • 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…

    On a +2a board, Z80 and ROMs away from you, ... visa versa) will fry the ULA/Gate Array chip.
    DEATH DEATH August 2006 Hardware
  • Questions and answers...I'm bored (downloading some Unreal Tournament levels, when they've finished I'm off to scoff my tea), so I thought I'd create this topic with some Ea…

    ... the thermal expansion of water due to the increase in temperature. You ... 's cooled down to room temperature. So, if you raise the ... temperature of the oceans by a ...
    Matt_B Matt_B August 2006 Chit chat
  • RealXThis may be a dumb question but will RealX ever get released?

    ... because that's what the Z80 actually does), which can possibly ... quoted:
    [quote]...the ULA gets confused by the memory ... refresh cycles of the Z80 (performed during each instruction ... by the ULA immediately after the rising edge of the Z80, which ...
    Luca Luca August 2006 Emulators
  • The Only Reason Sinclair Succeeded (Provoking Controversy)Although I love my Sinclairs dearly, I think that the only reason they succeeded was because at the time most people did not know any better (factori…

    ... think the 6502 vs Z80 speed ratio is higher ... seen a really poor z80 performance as well but ... to be exceptionally poor z80 code to achieve that. ... less flexible environment than the z80. Lots of people would ... been a problem for the ULA.

    [quote]
    Alcoholics Anonymous Alcoholics Anonymous September 2006 Sinclair Miscellaneous
  • The Only Reason Sinclair Succeeded (Provoking Controversy)Although I love my Sinclairs dearly, I think that the only reason they succeeded was because at the time most people did not know any better (factori…

    ... a 2.5MHz z80 to a 10Mhz z80. Clearly the latter ... .67:1 to meet the z80's performance.

    Regarding the 6502 and z80, the 6502 came out in ... Maybe but the ULA is monitoring the z80 bus for memory ... the same as the usual z80 refresh cycle. Maybe it ...
    Alcoholics Anonymous Alcoholics Anonymous September 2006 Sinclair Miscellaneous
  • 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…

    ... it does look like a thermal issue. In fact, if I ... with the lid off, the ULA gets so hot that I ...
    patters patters 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…

    ... , 4, 6, 8, ... speeds). The z80 clock, however, is derived from ... clocked a lot faster, the ULA was pretty much tied to ...
    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…

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

    Regards ...
    Marcelo Marcelo 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…

    ... 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
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