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<1234567…34>
  • DRAM (:baffled:)Hi, Can someone explain to me the definitive rules on DRAM access times in terms of suitability for a particular speed of processor? Specifically, …

    ... too fast, but in the 48K speccy, ULA generated RAS going high switches the 74LS157 mux to select the Z80 column address. This happens so fast ...
    csmith csmith January 2008 Hardware
  • Repairing a faulty 48K issue 2.I am investigating one of a pair of non-working issue 2 48K Spectrums that have been sitting in a cupboard untouched for quite a few years. I haven…

    ... measurements to try to determine the delay between /RAS going low and the address lines at the lower ... 74LS157 says should be the case.

    The 4116 datasheet says the row address ... is a valid logic high at the output. The rise time is also ...
    Zorn Zorn December 2011 Hardware
  • Some more questions for the WOS geniuses to ponderSome questions whilst I'm waiting here: 1.Why do cars need ariels to receive radio stations? I mean, you're driving around in a lump of metal, so w…

    ... off the top of the Empire State Building (and how high is the Empire ... could go back to 1982, to the time just after the ZX Spectrum had ... ideas?

    I was going to bang on about AI in ...
    ewgf ewgf October 2008 Chit chat
  • All going well with the 3.5" driveFolks, all going well thanks to you lot on here... I now have a +3 with an external 3.5" floppy and can write .dsk images using samdisk - all very e…

    Folks, all going well thanks to you lot on here...
    < ... which I used to successfully save onto the 3" disks to make this ... data on the pc so ... game and then save back to the 3.5" disk?

    bigredjennings bigredjennings July 2012 Hardware
  • ZX-Paintbrush and global palette and ula+ supportHello, I think I need some help for the palette issue of ZX-Paintbrush. I want to check whether the way I'm about to clear the palette handling i…

    ... disabled with the new option "Deactivate ula+ palette". This switches back to normal palette ... , but lets the colours of the last ...
    clausjahn clausjahn March 2017 Software
  • 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…

    ... true. The only way to fix the problem is to use Z80 refreshes when ULA bytefetch ... with row address from R. And this could be ULA's job ... into high-impedance mode for RAS line while retrace. Only while high-impedance ...
    brian-82 brian-82 November 2007 Development
  • Challenge Sprint 4x tape recorderHi, I noticed a [url="http://www.worldofspectrum.org/infoseekid.cgi?id=1000051"]Challenge Sprint[/url] on eBay, and checked out the WoS entry for it…

    ... record into it a digitally generated audio copy of Jet Pac ... into memory will have to deal with the ULA timming restrictions. As you ... addition to load, at high speed. The saved block was loaded again at address ...
    mcleod_ideafix mcleod_ideafix August 2011 Hardware
  • MB02 picsI got an original MB02 from someone to fix, and of course I made some pics to share (click for magnification): [URL="http://benophetinternet.nl/hobb…

    ... is indeed controlled by Speccy (ULA) and is low if CPU ... would only lay it permanently to high if MB02+ ROM/RAM is ... instead.
    So there has to be a different line that ... present this line has to be high. If the 74ls157 would be bad this ...
    ingo ingo February 2012 Hardware
  • Features that are still wanted in Spectrum emulation.Features that are still wanted in Spectrum emulation. 4 USB joystick/gamepad input for real multiplayer games - Yes, Bomb Munchies.... - Sinclair 12…

    ... on the call address. But you'd have to know what IN address the IF ... to check for one other bit going high. I dd get it to respond to ... the value of PC at the time of the interrupt, when the Z80 is fetching the ...
    zub zub June 2015 Emulators
  • Optimisation Needed! Is this the Fastest way to copy bytes from screen and back again?I have the screen address (say 0,0 i.e 16384) I want to copy 4 bytes wide by 32 bytes high from the screen to an area of memory. I then want to cop…

    I have the screen address (say 0 ... ,0 i.e 16384)

    I want to ... 32 bytes high from the screen to an area ... to "store", Then one to bring it back to the ... br /> ; Copy from store to the screen

    ld ...
    robpearmain robpearmain November 2005 Development
  • BASin r14d - Final bugfix for the r14 seriesOk, there's not a great deal to "show" here, as most of the work has been going on "under the hood" so to speak. And there's been a [i]lot[/i] of wor…

    ... to "show" here, as most of the work has been going on "under the ... hood" so to speak ... 'm going to need help with this, so I may be asking the ... can no longer OUT in the z80 core, so a lot of ...
    Dunny Dunny December 2008 Emulators
  • Connecting the Toast rack to VGAHi, I've been trying to get my 128k toast rack to connect to my VGA screen for a while now with not much luck. I couldn't find a cable or adaptor to…

    ... RGB - Scart cable (which works going to TV) a TV tuner card ... , then connected my PS2 to the RCA jacks and it worked ... connected the RGB -SCART to a coupler, then connected the SCART to RCA ... I also tried going from the RF to the aerial socket on the TV card ...
    ayster ayster May 2012 Hardware
  • At long last i got the speed loader to work.Been trying for almost 3 weeks on getting this speedloader Otla (or whatever it is) to work on my spectrum and tonight I found out how to get it goin…

    ... I found out how to get it going.

    ... being used as the main PC to spew the info out. I ... just before it started to load the game in. Well as ... converted now load into the spectrum with no problem ... loads in the games i converted into the speedloader too ...
    morcar morcar May 2012 Sinclair Miscellaneous
  • Built a ZX Spectrum that works, but can't get the upper RAM to work?Like the title says I finished my Spectrum 3B board, and it boots, but it doesn't see the upper 32k of RAM. When it boots, the lower 16k works f…

    ... upper RAM bad. But the program seems to know that it's ... seem to get activity on A15 with my oscilloscope (on both the ULA ... and CPU), however, the voltage is way too ... ] 85, 170, and 0 to that address, but PRINT PEEK returned 85 ...
    DistantStar001 DistantStar001 June 2022 Hardware
  • Project: M.u.l.e.Wokani came up with a great idea about trying an open-development approach for spectrum games, and I thought why not try with a game I have under dev…

    ... thought I was going to need it again ... billion or so). The z80 has register pairs ... to the address of the string plus the length of the string, which turns out to be the address ... z88dk). So the idea is to select 9 ranges ... -4 to be generated 0.013% of the time. ...
    Alcoholics Anonymous Alcoholics Anonymous July 2007 Development
  • Inflatlation at 4.4%Inflation at 4.4% and still our government seem to do nothing. Given that the governments target inflation was 2% WFT??? Everyone is taking the pi…

    ... of oil so high? Is the world beginning to run out? I know ... 's pretty much the case. Demand keeps going up and up, but ... supply is pretty close to topping ...
    Matt_B Matt_B August 2008 Chit chat
  • Sinclairean A3[B]Sinclairean[/B], a new ZX Spectrum emulator written in machine code for x86-compatible, OpenGL-capable computers. Features: [LIST] [*]Fast machin…

    ... you want to display ALL ULA generated pixels (using FULL mode), the resulting image ... 4:3 anymore (as the ULA seems to output wider vertical borders in ... extend beyond the far extremes, as the ULA is simply generating the next scan ...
    Madonna Mk 2 Madonna Mk 2 April 2010 Emulators
  • what is this crazy modfound a speccy in my loft yesterday,and it seems to have an external heatsink modd i havent the foggiest about speccys heres a few pics [url]http://i…

    ... are basically, too high for the original heatsink to fit back in, meaning ... /> Back to the present fault though, if its a bad address at line ... /> FURTHER EDIT: I think im going to fit a 78S05 out of ...
    Macc Macc January 2012 Hardware
  • Spectrum CP/MHello.. Just out of curiosity, has anyone actually used +3 CP/M for any practical purpose? I remember booting it up a couple of times years ago, jus…

    ... it's used. The masks used to make an x86 processor ... the ULA does. In those days, maybe the process used to make the ULA ... only had a dozen layers and the ... whereas the x86 is about careful layout to extract as high performance ...
    Alcoholics Anonymous Alcoholics Anonymous November 2013 Sinclair Miscellaneous
  • Features that are still wanted in Spectrum emulation.Features that are still wanted in Spectrum emulation. 4 USB joystick/gamepad input for real multiplayer games - Yes, Bomb Munchies.... - Sinclair 12…

    ... trying to emulate the hardware, but when you're trying to pick another address to ... on the call address. But you'd have to know what IN address the IF ... to check for one other bit going high. I dd get it to respond to ...
    joefish joefish June 2015 Emulators
  • ZEsarUX 6.1 BETAHi I have uploaded a new ZEsarUX BETA version 6.1. You can download it from the usual beta url: https://sourceforge.net/projects/zesarux/files/…

    ... this applies only to the Y values generated by the ULA, not to the dematrixing performed by ... a television to get RGB ...
    rga24 rga24 February 2018 Emulators
  • What would be the best game to play ...... while playing Stonkers? Definitely not ... err ... The Great Space Race, unless you have a new model of the spectrum that can perform multitaski…

    ... br />
    Definitely not ... err ... The Great Space Race, unless you ... have a new model of the spectrum that can perform ... these 'what would be the best game to play ...' threads. I ... only asked the first one cos I bought the ...
    Ian Hamilton Ian Hamilton May 2005 Chit chat
  • The Teenbeat: Caravan To Obscurity album hi, Shaw Brother Ade's band have a new release on cd-r: The Teenbeat: Caravan To Obscurity Triple CD Box-set (Parts One, Two and Three) Featurin…

    ... :

    The Teenbeat: Caravan To Obscurity
    Triple ... I Never Got To Tell Her, Royston, Remember The Love, Paraphernalia ... Run, Anglesey, Standing On The Edge, Teenage Girl, Scarborough, ... , England by The Teenbeat. Mixed by the Venus Pollution Project ...
    sickhappyidle sickhappyidle July 2005 Chit chat
  • The best spectrum to buy?I bought a +2 on ebay recently(my spectrum+'s RF unit went fizz) and i'm having some problems with it.... Sabre wulf, Aticatac, Jetpac all lock up a…

    ... anyone else experienced problems with the +2?
    I would like ... a Spectrum that will load the older games, has a decent ... on which would be the best model to buy ??

    Many ...
    stunik101 stunik101 September 2005 Sinclair Miscellaneous
  • The Best time to List an Ebay AuctionI was wondering what is the best time to list an Ebay auction. I used to think it was the weekend as most people are at time and have the time to br…

    I was wondering what is the best time to list an Ebay auction ... />
    I used to think it was the weekend as most people ... are at time and have the time to browse for goodies, now ... sure as office users in the week may be a better ...
    Scottie_uk Scottie_uk March 2007 Chit chat
  • Which is the best spectrum to have ?Just wanted to know which is the best Spectrum to have as i know some have more bugs than others. All i wanted it for was to play games on both 48k …

    Just wanted to know which is the best Spectrum to have as i know some have more bugs than others.

    All i wanted it for was to play games on both 48k and 128k

    cheers
    morcar morcar March 2008 Hardware
  • the Plot - how to play?anyone tried to play this thingy? even with kempston chosen can't find the proper way to use the controls and to do anything :confused: just able …

    ... find the proper way to use the controls and to do ... anything :confused:

    just able to ... move L/R and jump in the first ... .... is this all of the plot down there?
    ... (no passing through the doors and so on...)
    de Vandemar Croup de Vandemar Croup March 2008 Games
  • How to know the year linked to a serial number?Hello are there available online registers for finding out the year linked to a serial number? For example: could you tell me the year of this one?…

    Hello

    are there available online registers for finding out the year linked to a serial number?

    For example: could you tell me the year of this one? 009-779380 thanks
    unixxx unixxx January 2009 Sinclair Miscellaneous
  • Wireless JoystickA while ago I acquired a big lot of random Sinclair hardware and started sorting it out tonight. I came across this. [URL="http://www.zxsoftware.co.…

    ... you can see it appears to be wireless joystick. There ... have on/off switches.

    The aerial extends to about 19" ... .JPG[/url]

    The base unit takes 4 AA ... battery's with the joystick taking a single ... 't had a chance to get it tested with ...
    ADJB ADJB July 2010 Hardware
  • Spectrum +2 problem - the hat trick!Ok, 3rd Spectrum hardware test, 3rd problem. Power up a +2 and everything seems to be fine with the menu displaying. Go to move the cyan bar to selec…

    ... fine with the menu displaying. Go to move the cyan bar to select another option ... from the menu and ... nothing happens - no movement of the select ...
    redballoon redballoon April 2011 Hardware
<1234567…34>

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