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<1234567…34>
  • Spectrum ULA replacement!Hi gang.. The Speccy 48 ULA Replacement is *almost* here ;) There has been lots of activity in building the CPLD board, sorting out some irritating…

    ... gang..
    The Speccy 48 ULA Replacement is *almost* here ;)


    Anyway, the machine with ULA replacement doesn't quite boot up ...
    csmith csmith April 2008 Hardware
  • ULA Replacement WORKS !Hi chaps. Lots of activity over the last couple of weeks, and _finally_ we have [B]a working ULA replacement[/B] !! The analogue components such …

    ... we have [B]a working ULA replacement[/B] !!

    The analogue ...
    csmith csmith May 2008 Hardware
  • ULA Replacement??I searched, but maybe I just missed it. Has there (or is there) anyone working on a ULA replacement either as an FPGA or CPLD package? Or, perhap…

    I searched, but maybe I just missed it.

    Has there (or is there) anyone working on a ULA replacement either as an FPGA or CPLD package? Or, perhaps something else such as a microcontroller?

    Thanks
    cbmeeks cbmeeks October 2015 Hardware
  • Retroleum Nebula - A Spectrum ULA replacement moduleHey you guys.. Just wanted to mention a new Spectrum doobrie created by myself (Phil Ruston) and Alessandro Dorigatti: Namely, the Nebula - A Spec…

    ... , the Nebula - A Spectrum 48 ULA replacement module. You can read all ... .uk/electronics-articles/nebula-spectrum-ula-chip-replacement-module/

    (Big ... thanks to Chris Smith for the ULA ...
    Retroleum Retroleum April 2016 Hardware
  • ULA Book - Target Audience?This is probably of most intrerest to hardware chaps, but a greater community input would be good. I've been turning all my ULA analysis into a love…

    ... been turning all my ULA analysis into a lovely ... "The Sinclair ZX Spectrum ULA". I'm doing this ... as creating a complete ULA replacement, so effort is split ... features of the machine the ULA encapsulates.
    Do ... the specifics of the ULA internals, it's going ...
    csmith csmith May 2008 Sinclair Miscellaneous
  • MicroDrive ULA replacement - best way?I have a mirodrive playing up, odd motor sound, sometimes it reads ok sometimes not. Just wondering if its worth replacing the ULA in it, and whats …

    ... if its worth replacing the ULA in it, and whats the ... a look. I have a ULA chip about the place.
    Steve(spt) Steve(spt) May 2009 Hardware
  • Is there any video input on expansion bus?Imagine you want to build a custom display hardware, for instance, to add hardware sprites to display. Is it possible to design such a device so that…

    ... is only hooked to ULA and copy currently generated ... It only count cycles of ULA (starting by INT) and ... also sure that complete ula clone will fit to ... 144 is used for the ULA replacement, so we'd need ... close cover.

    VHDL is created by David Luftner ...
    csmith csmith March 2010 Hardware
  • ZX Spectrum ULA core available at OpenCoresHi! On April, 23th, I opened a new project at the OpenCores website: [url]http://opencores.org/project,zx_ula,Overview[/url] Right now, it has a, h…

    ... , using a CPLD for a ULA replacement, with modern SRAM and Flash ... implementing a partial model in VHDL but without the memory and ... contention.

    Hopefully this ULA core will kickstart other projects!
    JonS JonS May 2012 Hardware
  • Looking for advice on building a HarlequinNew member here. From the US. My first computer was a Timex Sinclair 1000 back in the early 80s (in fact, I got one of the first batches sold in th…

    ... on to produce an actual ULA replacement board called the [url="http ... .uk/electronics-articles/nebula-spectrum-ula-chip-replacement-module/"]Nebula[/url].
    ULA in a Xilinx XC95144XL. Just haven't seen any Verilog/VHDL ...
    RetroTechie RetroTechie February 2017 Hardware
  • Pentagon floating bus timingI wanted to take a little break from working on the ZXDS UI yesterday, so I added support for Pentagon timing instead, so I can finally enjoy the lik…

    ... timing. An explanation how the ULA replacement fetches the bytes without any ...
    Patrik Rak Patrik Rak November 2007 Emulators
  • Socket to me..Specchums ! I'm laying out the PCB for the ULA replacement, and I need to know how common it is for the following IC's to be socketed (all to the ri…

    ... out the PCB for the ULA replacement, and I need to know ... to the right of the ULA):

    Issue 2 - IC25 ... /> Capacitor C28 next to the ULA might pose a problem, so ...
    csmith csmith May 2008 Hardware
  • Suggestions for Mr. Rich MellorRich, is there a chance any of these things could be available from you in a near future? -AY interface for 16K/48K Spectrums -PS/2 keyboard interfa…

    ... /> -Services to upgrade Spectrums (rom replacement (would also be offered as ... (sound fix on +3, memory replacement, ula replacement, hardware fix to add chip ...
    zxbruno zxbruno November 2008 Hardware
  • Component count/modern replacementsThere is a thread/project for replacing the old memory with simms There is also the ULA replacement. There's DEATH's composite replacement. What els…

    ...
    There is also the ULA replacement.
    There's DEATH's ... composite replacement.

    What else can ...
    dekh dekh February 2009 Hardware
  • ZX in FPGA...Hmm..seems nobody is interested in a replacement PCB with FPGA...well..heading towards next FPGA projects then...C64 and others (o; [ This Messag…

    ... that. Just interesting in your ULA replacement.

    Not sure if ...
    pern pern July 2004 Sinclair Miscellaneous
  • 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…

    I saw long ago some schematic of ULA replacement, with about 50-60 logic chips. Very likely it is not 100% compatible - memory contention hardly can be same.
    piters piters May 2006 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…

    ... I/O pins for a ULA replacement - IIRC, all but four pins ... Z80, especially since the Spectrum ULA's port decoding merely consisted ...
    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…

    ... active gates were in the ULA? I coudn't imagine a ... 1982 technology ULA had _that_ many.
    [/QUOTE ... -70 msi TTL chips for ULA replacement.
    piters piters March 2007 Sinclair Miscellaneous
  • I want to build a new, super spectrum ;-)only kidding Andrew :-) my brain's going at a mile a minute at the moment, so I thought I should put some of the ideas down in case one of them is w…

    ... chips like the CPU and ULA to suffer SCR latchup (CMOS ... anything critical.

    The ULA is a bit of a ... a Spectrum project - not a ULA replacement, but for a CP2200 based ... a small set of DRAM replacement daughterboards - one for lower RAM ...
    Winston Winston September 2007 Hardware
  • 48K vs 128KWhat does everyne think is the best machine - the 48k or the 128k? Personally i prefer the 128K+2. It has more memory, built in tape deck (so no fid…

    ... someone comes up with a ULA replacement that makes the later Spectrums ...
    JamesD JamesD September 2007 Games
  • Broken SpectrumsChaps ( & Mrs Death ), I was looking at getting some dynamic ram chips for the next phase of the Harlequin stuff, and I started thinking...... I've…

    ... dynamic ram for my harlequin/ULA replacement prototype was my original goal ...
    csmith csmith October 2007 Hardware
  • Broken SpectrumsChaps ( & Mrs Death ), I was looking at getting some dynamic ram chips for the next phase of the Harlequin stuff, and I started thinking...... I've…

    ... dynamic ram for my harlequin/ULA replacement prototype was my original goal ...
    DEATH DEATH October 2007 Hardware
  • ULA RAS, CAS cycles, refresh and "snow effect"Hello everyone. I have a question, does anyone observed timings of RAS and CAS generated from ULA? I think there may be answer to where the "snow ef…

    ... .

    Basically, the ULA is responsible for generating the ... snow.

    Summay: ULA generates RAS for the Z80 ... refresh pulses....... So will my ULA replacement ;-) )

    Watch out ... mini-book "The ZX Spectrum ULA" which will be out ...
    csmith csmith November 2007 Development
  • ULA RAS, CAS cycles, refresh and "snow effect"Hello everyone. I have a question, does anyone observed timings of RAS and CAS generated from ULA? I think there may be answer to where the "snow ef…

    ... refresh pulses....... So will my ULA replacement ;-) )[/QUOTE]

    Note that ...
    Fred Fred November 2007 Development
  • Pentagon floating bus timingI wanted to take a little break from working on the ZXDS UI yesterday, so I added support for Pentagon timing instead, so I can finally enjoy the lik…

    ... timing. An explanation how the ULA replacement fetches the bytes without any ...
    zub zub November 2007 Emulators
  • Spectrum ULA replacement!Hi gang.. The Speccy 48 ULA Replacement is *almost* here ;) There has been lots of activity in building the CPLD board, sorting out some irritating…

    [QUOTE=csmith;259667]Hi gang..
    The Speccy 48 ULA Replacement is *almost* here ;)
    [/QUOTE]

    so there are differences between 128k ula and 48k ula(?).
    Arda Arda April 2008 Hardware
<1234567…34>

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  • Spectrum ULA replacement!Hi gang..<br /> The Speccy 48 ULA Replacement is *almost* here ;) <br /> <br /> There has been lots of activity in building the CPLD board, sorting o…
  • ULA Replacement WORKS !Hi chaps.<br /> <br /> Lots of activity over the last couple of weeks, and _finally_ we have [B]a working ULA replacement[/B] !! <br /> <br /> The a…
  • MicroDrive ULA replacement - best way?I have a mirodrive playing up, odd motor sound, sometimes it reads ok sometimes not.<br /> <br /> Just wondering if its worth replacing the ULA in it…
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  • ZX Spectrum ULA + Glue Logic in VHDL for EPM78128SLC84Hi.<br /> <br /> I'm wanting the VHDL code for the Spectrum ULA and Glue logic to pop onto a Alter MAX EPM7128SLC84 (CPLD) IC.<br /> <br /> I'm wanti…
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