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<1…12131415161718…34>
  • 30-column 8x2 multicolor (even in 48K)I don't recall any 8x2 multicolor routine for 30 columns that would work on all Spectrum models (including the Spectrum 48K), so I decided to write i…

    ... before ULA access of the line). These numbers are written for contention ...
    Alone Coder Alone Coder May 2014 Development
  • Plea for new hardwareI'm posting this as a poll as I want to judge if I'm a solo loon going on about this, or if people really are interested in either of the following S…

    ... :-)

    In a word contention. I completely missed the fact ... to fake the effects of contention via the clashbasher by using ... with an internal ULAplus ULA fitted ie double contention. :o

    Basher Basher May 2014 Hardware
  • Plea for new hardwareI'm posting this as a poll as I want to judge if I'm a solo loon going on about this, or if people really are interested in either of the following S…

    ... to fake the effects of contention via the clashbasher by using ... with an internal ULAplus ULA fitted ie double contention. :o[/quote]
    chev chev May 2014 Hardware
  • Plea for new hardwareI'm posting this as a poll as I want to judge if I'm a solo loon going on about this, or if people really are interested in either of the following S…

    ... back now to keep the ULA+ core synchronized with where the ... use. Now I have added ULA+ pallets to the clashbasher the ... . If the spectrum is in contention the clock stays low and ...
    Basher Basher May 2014 Hardware
  • eBay 128K Spectrum RGB cables overheat the Spectrum!?Hi everybody, For a long time I've wondered why Spectrum 128K Toastracks were overheating when using my Retro Computer Shack RGB SCART cable. Today …

    ... , no video ram reading and contention problems.
    Simply a transparant ... /> No more need for a ULA ;)

    [edit]
    Or ...
    bverstee bverstee May 2014 Hardware
  • HDMI generation by cloning video ram(coming from [url]http://www.worldofspectrum.org/forums/showthread.php?p=768257&posted=1#post768257[/url]). A thing I was brainstorming about.. Why …

    ... , no video ram reading and contention problems.
    Simply a transparant ... /> No more need for a ULA ;)[/QUOTE]

    Well, that ... could detect OUTs and mimic ULA plus palette and multicolour, and ...
    joefish joefish May 2014 Hardware
  • 48K: Half of copyright message in the middle of the screen?!Issue two. Has 74LS08 over the Z80, but the ULA is 5C112E-3 (I think this should be a 5C102E??? - I have one, but I'm not sure if it is working, at l…

    ... 2's with the 5C102E ULA and the dead cockroach fix ... say someone's replaced the ULA but not removed the 74LS ... aren't attached to the ULA, this could be causing all ... least I'd expect memory contention to be messed up.
    balford balford May 2014 Hardware
  • eBay 128K Spectrum RGB cables overheat the Spectrum!?Hi everybody, For a long time I've wondered why Spectrum 128K Toastracks were overheating when using my Retro Computer Shack RGB SCART cable. Today …

    ... ( and overload BRIGHT signal from ULA :confused: ) ?[/QUOTE]

    The ... , no video ram reading and contention problems.
    Simply a transparant ...
    Fruitcake Fruitcake May 2014 Hardware
  • z80 commands timeshi! I need site with z80 commands mashine times. I remember, I saw one as table, maybe in .cc domain, but pity forgot link. for example LDI take 16 …

    ... shows real instruction breakdown under ula contention, it also teaches you why ...
    Arda Arda July 2014 Development
  • z80 commands timeshi! I need site with z80 commands mashine times. I remember, I saw one as table, maybe in .cc domain, but pity forgot link. for example LDI take 16 …

    ... shows real instruction breakdown under ula contention, it also teaches you why ...
    MatGubbins MatGubbins July 2014 Development
  • What if Sinclair had released a 16 bit Spectrum?Had Sir Clive not wasted his companies money on the white elephant that was the C5 and instead focused on competing with his rival computer manufactu…

    ... the ZX8301 ULA wasn't crippling the CPU with contention. It steals ...
    Matt_B Matt_B July 2014 Games
  • What if Sinclair had released a 16 bit Spectrum?Had Sir Clive not wasted his companies money on the white elephant that was the C5 and instead focused on competing with his rival computer manufactu…

    ... , i.e. the nasty bus contention and (sometimes ill-deserved) reputation ... ?s work has shown, the ULA in the original Spectrum was ...
    RST#08 RST#08 July 2014 Games
  • Video fault on issue two ZX boardI've trawled the Internet and drawn a few blanks as to where to look to resolve the fault with my issue two board. I'm hoping a few of you knowledgea…

    ... to alter the addressing/contention of the ULA. Now depending on ... connects to the ULA (normally the ULA pins are lifted ... to two of the ULA pins), depends on how ... the later ULA is fitted. If the ... let the later version ULA pins fit into the socket ...
    1024MAK 1024MAK September 2014 Hardware
  • Issue 4s - Not 'Jailbars' but lines alloverIt's not another 'Jailbars' question!, but I've got this Issue 4S that aside from the 'Jailbars' on the Paper area of the screen which I can live wit…

    ... edge. This is because the ULA begins reading pixel data about ... , and if the CPU enters contention, the ULA halts its clock, thus ... because of the above mentioned contention.

    A quick ... Isolate the power line feeding ULA and video circuitry from high ...
    mcleod_ideafix mcleod_ideafix September 2014 Hardware
  • Noob repairs of an S2 and S6AI received two Spectrums a Series 2 and a Series 6A both of which are not working. I don't know anything about electronics so thought my lad and I wo…

    ... an issue with the ULA and IO port contention. Without it, peripherals ... in future revisions of the ULA and the transistor was incorporated ...
    balford balford September 2014 Hardware
  • Please explain Spectrum FPGA-clones to meI've been using the great ZXDS-emulator on the DS XL so far, which is great. But I kinda missed toying around with hardware. I've tried bidding on a …

    ... Spectrum emulator to replace the ULA emulation with "ULA2", but ... unravelling the secrets of the ULA... I started formalising some ... CPU speeds derived from original ULA timings - 3.5MHz, 7MHz ... works and lack of memory contention, border and multicolour effects ...
    JeffB JeffB November 2014 Hardware
  • Weird symptom number 2...I got a new keyboard membrane for my Spectrum+ plugged it in and low and behold the weird left to right printing of the copyright message disappeared…

    ... are generated directly by the ULA and are not influenced by ... only corrects overly aggressive IO contention - you can run a Speccy ... between pin 12 of the ULA and pin 16 of the ...
    balford balford November 2014 Hardware
  • Ensure my interrupt handler begins at the same T-stateHi! Is there a way to ensure that an IM 2 interrupt handler starts always at the same T-state (related to the moment the ULA triggers the INT line, w…

    ... to contended memory when the ULA is contending memory causes it ... if the computer has no contention in video memory :( (or does ...
    mcleod_ideafix mcleod_ideafix November 2014 Development
  • Ensure my interrupt handler begins at the same T-stateHi! Is there a way to ensure that an IM 2 interrupt handler starts always at the same T-state (related to the moment the ULA triggers the INT line, w…

    ... to contended memory when the ULA is contending memory causes ... if the computer has no contention in video memory :( (or ... />
    No, it needs contention somewhere (not necessarily in the ... thus "align" them with contention cycles. Therefore this technique won ...
    Einar Saukas Einar Saukas November 2014 Development
  • Timing_Tests-48k_v1.0 results...Hello All, I ran these [URL="http://www.zxspectrum4.net/op_timing.php"]tests[/URL] on my emulator and some of the tests failed.. so I tried it on a …

    ... test 35 as long as ULA+ is disabled, and it passes ... spent on figuring out the contention details [URL="http://www.worldofspectrum ... point is to test the contention timing, not the emulation of ...
    Patrik Rak Patrik Rak November 2014 Emulators
  • Timing_Tests-48k_v1.0 results...Hello All, I ran these [URL="http://www.zxspectrum4.net/op_timing.php"]tests[/URL] on my emulator and some of the tests failed.. so I tried it on a …

    ... test 35 as long as ULA+ is disabled, and it passes ... spent on figuring out the contention details [URL="http://www.worldofspectrum ... point is to test the contention timing, not the emulation of ...
    Richard_Butler Richard_Butler November 2014 Emulators
  • Understanding contentionI'm trying to understand contention and its implications when some "weird" bus cycles (such as I/O cycles with I/O addresses in the contended memory …

    ... design fault with the ULA, the ULA I/O contention handler is irrelevant ... , as the memory contention handler is ...
    1024MAK 1024MAK May 2015 Hardware
  • Understanding contentionI'm trying to understand contention and its implications when some "weird" bus cycles (such as I/O cycles with I/O addresses in the contended memory …

    ... My ULA design has borrowed the contention circuit from the ULA book verbatim ... a version of that contention handler based upon the ... frequency and yet, have proper contention when needed.

    ULA replacement chip, I always ...
    mcleod_ideafix mcleod_ideafix May 2015 Hardware
  • Understanding contentionI'm trying to understand contention and its implications when some "weird" bus cycles (such as I/O cycles with I/O addresses in the contended memory …

    ... early timming mode, executing the ULA TEST 3 by Jan Bobrowski ... Smith to show I/O contention.



    From ...
    mcleod_ideafix mcleod_ideafix May 2015 Hardware
  • I feel they could have done this.After reading the ZX Spectrum ULA, I learned about how the ULA detects if the Z80 if going to access memory in the next cycle and stops it if the ULA…

    ... program to avoid "direct" contention with ULA to update the screen, would ... two screen buffers, where the ULA sees one, while program ...
    We would still have contention to access RAM, but we ... probably fit easily inside the ULA.

    That would ...
    RMartins RMartins August 2015 Hardware
  • I feel they could have done this.After reading the ZX Spectrum ULA, I learned about how the ULA detects if the Z80 if going to access memory in the next cycle and stops it if the ULA…

    ... in the Spectrum's 6C ULA with all the stuff that ... to implement in terms of ULA resources. You'd need enough ... when the ULA isn't generating the screen picture. The contention circuit ...
    Winston Winston August 2015 Hardware
  • ULAAre ULA's (for Spectrum 48k's) interchangeable through the different issues? To give some background, to work out what was wrong with an old speccy I…

    ... the Spectrum 48K ULA:

    - 5C102E: Original ULA, found on ... boards. Have a I/O contention fault that necessitates the 'dead ... CPU in machines containing this ULA (Issue 2 boards).
    - ... incorporated into the 6C001E-7 ULA.

    All the ...
    balford balford September 2015 Hardware
  • How did bank switching work on the 128K Spectrums?I'm new to Z80 and ZX Spectrum. So I was wondering how the 128+ models managed to work with more than 64K of memory? I'm somewhat familiar with h…

    ... between the z80 and the ula so a simultaneous access by ... momentarily and this is called contention. If you're trying to ... avoid contention to run timing critical code ...
    Alcoholics Anonymous Alcoholics Anonymous October 2015 Hardware
  • Was there a POKE that broke the SpectrumHi Everyone I've been recalling myths and rumours from back in the day. You know "Lunar Jetmans" trailer and that sort of thing. But one rumour …

    ... has no effect, as the ULA decodes and controls the ROM ... ROM area may cause bus contention / bus clash. This happens because ...
    1024MAK 1024MAK October 2015 Sinclair Miscellaneous
  • Ninjaman 8-way scrolling 50Hz multicolour demo :-)Here's a demo I've been working on for a while. The goal was to make the best scrolling routine possible on a humble 48K ZX Spectrum. I was origin…

    ... execute. Too late, and the ULA will already have read in ... the old attributes before the ULA read them.

    The ... to account for the various contention differences between the 48/128 ...
    Kayamon Kayamon November 2015 Development
<1…12131415161718…34>

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