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zx spectrum ULA upgradei have a issue 2 zx spectrum 16k which i upgraded to 48k .. i believe the ULA is faulty (ULA5C112E-2) .. seems intermittent i know a later one can be…
i have a issue 2 zx spectrum 16k which i upgraded to 48k .. i believe the ULA is faulty (ULA5C112E-2) .. seems intermittent i know a later one can be used but should some resistor values be changed to match it ?
thanks mark .. -
48k ULA heat sink required ?ULA heat sink worthwhile mod or just internet hype ? if worthwhile is a cheap heat sink going to cut the mustard ? i wonder if anybody has done any …
ULA heat sink worthwhile mod or just internet hype ? if worthwhile is a cheap heat sink going to cut the mustard ?
i wonder if anybody has done any before & after heat tests ? -
Interface 1 ULAIs there a technical description of the functionality of the Interface 1 ULA, similar to the "The ZX Spectrum ULA" book? Specifically, what is the…
... functionality of the Interface 1 ULA, similar to the "The ZX ... Spectrum ULA" book?
Specifically, what ... the ROMEN lines of the ULA? Superficially, ROMCS feeds into the ... -
Sort 2 byte words (x, y) on ypos, also question about swap (DE), (HL)Well that was a lot of debugging ;) But if you want a routine which takes an array of 16 byte words x, y and then sort them on y (ignoring x), I'm…
... array of 16 byte words x, y and then sort them ... on y (ignoring x), I'm your man lol ... byte values and those are x-coord, y-coord. It sorts ... -coord only and ignores the x-coord.
Uses a ... -
Anyone got a copy of 'Z80 for primates'?This Z80 lark isnt easy, in fact it makes me feel very much like Washoe the chimp trying to learn learn sign language, I just dont think I've got the…
... sensible (for contention issues with ULA memory and all that if ... routine rather than simply do X,Y,Z to get a ... -
Fake screenshots? No - now it's REAL screenshotsOk then. A few weeks ago I said I will show You the new gfx-mode of Speccy and - here it is: [url="http://republika.pl/hooy_prg/hprg.zip"]http://rep…
... this is 768 bytes (8 x less than a screen without ... TAP into RealSpectrumEmulator, and use ULA FX Hardware Multicolour to display ... updated drvers with opengl. direct x - i have 9.
[/quote ... -
Strange layout of Spectrum video memoryHello, does anyone have an idea why the Spectrum's video memory has such a strange layout? I understand that a resolution of 256x192 is an easy mean…
... Y Y y y y x x x x x
Sinclair layout:
x x x x x
[/code]
Where ... have been nice if the ULA had a software-controlled switch ... optimiesd) you would like the ULA to use.
_________________ ... -
Investronica Inves Spectrum +Hi, Has anyone here ever heard of the Investronica Inves Spectrum +? This site [url="http://www.silicium.org/uk/sinclair/inves.htm"]http://www.sili…
... be easily modified. Also, the ULA was vastly enhaced, and developed ... 16. They are two 64K x 4 bit chips connected in ... which is divided for the ULA and the CPU.
Lesser used BASIC commandsAre there any interesting articles or books that explore some of the lesser used BASIC commands/functions e.g. DEF FN, IN, OUT etc? The Spectrum BAS…
... screen. It writes to the ULA?s (uncommitted logic array) register ... the byte sent to the ULA control the border colour of ...
10 DEF FN A(X)=X^3
20 INPUT ?ENTER ...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…
... been asked for a +2(x) membrane - is this something else ...
Z80 processors ?3
ULA chips for the 48K ?5 ...Did I killed my Speccy ???Hi guys, 1 minute ago I was working on my 128 +2A... But I made a mistake : I cut the gound on the PSU plug of the computer, and I forgot to resolde…
... you've taken out the ULA chip too, in which case ... a replacement part for that ULA and you certainly won't ... paint stripping gun (a 32k x 8 SRAM) and it worked ... even if you get the ULA off there's the problem ...Spectrum +3 Problem & A Modification IdeaThis is a dual post. And it's also my first post, so I apologise if I get stuff wrong lol. My mate bought a Spectrum +3. I'm unsure about how many d…
... is basically just a 5 x 8 (IIRC) switch matrix. By ... board)
Incidentally, the ULA on a Spectrum is pretty ... in PC terms. If the ULA has failed in such a ...Reason for strange display layout?I have always wondered if there is any technical reason behind the strange layout of the display file or why did Sinclair choose to do it this way?
It always made me wonder whether the ULA was based on a display device that was 256 x 64 pixels (32 chars by 8 chars). Apart from the fact that there are three blocks of this, each third screen is [i]very[/i] logical when viewed by itself.ULA chipHi. Where i can find a ULA 6C001E-6 chip for an 3B issue Speccy ? Also looking for one 7805 heatsink... Thank
... that 20 quid for a ULA is extremely expensive...
x-SPECTRUM-48K-MOTHERBOARDS-PCBS-SPARES ... is too much for a ULA (plus postage).
And lets ...ULA chipHi. Where i can find a ULA 6C001E-6 chip for an 3B issue Speccy ? Also looking for one 7805 heatsink... Thank
... that 20 quid for a ULA is extremely expensive...
... .ebay.co.uk/3-x-SPECTRUM-48K-MOTHERBOARDS-PCBS- ... is too much for a ULA (plus postage).
And ... the other parts, just the ULA chips, so that particular ... a fair price for a ULA chip - considering that the ...Running code from the display memory?Is it possible to run machine code from the memory area used by the display file? If you were really out of memory and some part of screen is not u…
... for each opcode (each ULA type has different contention points ... cycles per eight cycles during ULA display fetches. The + ... The 48K/128K machine's ULA responds only to what ... bus whereas the +3 ULA responds to the combination ... 1:3,[pc+1:1 x 5]
After fetching ...How does interrupts work?I am a little confused regarding the interrupts on the Spectrum. If I have some hundred bytes of machine code started with, say, [B]RANDOMIZE USR 300…
... to be drawn (as the ULA has priority on this RAM ... number changes but not its (x,y) position, you may be ...+2B problem stillHi all, I have a spare +2B that still dont work. Richard kindly sent me 4 x 4464 ram chips but the +2B still dont work I have swapped over both ROM`s…
... /> Richard kindly sent me 4 x 4464 ram chips but the ... ? If so, then bad news: ULA chip probably. Unless you can ... of a job, changing a ULA chip, unless you have the ...Contention and floating bus timingHello, I was recently playing a bit with memory contention and floating bus stuff in ZXDS and there is one thing which puzzles me a bit. It is the d…
... doing a read at "x" tstates, it is actually ... sampling the bus at "x-1" tstates. This is ... measuring time from when ULA pulled INTREQ low (IM2 ... He counts everything relative to ULA, same as Chris does, ... things happen with respect to ULA, not Z80.
Does anyone have the CD codemaster pack?Hello [sorry for my poor English] I'm studding the cable of codemaster cd pack [url]http://www.crashonline.org.uk/73/cd.htm[/url] I have some pr…
... /+3 ( I burn a +2A ULA ) and it has a strange ... the same... Too bad an ULA was fried, though. Ok, you ... /> 8 | GND
9 | Pot X[/code]I don't know ...Fuse for Mac OS X beta releasesA beta version of Fuse for Mac OS X has been released at the dedicated sourceforge project: [url]http://sourceforge.net/projects/fuse-for-macosx/[/u…
... of Fuse for Mac OS X has been released at the ... this release requires Mac OS X 10.4+ and hardware accelerated ... active, as the +2A/+3 ULA applies contention only when MREQ ...Russian SpectrumAnybody know what model this is please ? [url]http://www.zxsoftware.co.uk/sinclairmachines.php?spgmGal=SinclairMachines/Russian%20Spectrum[/url]
... clone is based on SQUARE ULA (ULA216 used too in more ... .narod.ru/ZX-Spectrum/PLM-X/PLM-X.htm[/url]
ULA216 ...Questions about the Speccy and it's emulationOut of interest, and to raise another interesting discussion, I have some questions about the Spectrum and it's emulation; 1) Is everything known ab…
... RAM speed depends strictly from ULA and CPU clock speed, so ... effects in Starion and Paperboy :x). Is the 128 faster in ...Interlace demoSorry to reference another thread like this, but in the thread: [url]http://www.worldofspectrum.org/forums/showthread.php?p=313428#post313428[/url] …
... /> [ Lots of NOR gates, the ULA basic gate type]
0 1 0 x 1 0
0 1 ...Hello everyone. (+ a question.)Hello everyone. I have been visiting WOS since 1999 but I have only recently signed up for the forums. So, first of all, thanks to those who are main…
... keyboard lines coming from the ULA that are connected directly to ... the gate array (K-x to MA-x) pins. (No connection to ...4116 DRAM for 48KSomeone told me I got faulty RAM in my broken 48K. They should be 150ns, right? What would be a good place to buy them from?
... with a static RAM (32K x 8 bit, only one half ... , but screen data for the ULA got chewed up sometimes. Tried ... some critical moment when the ULA reads / writes to the lower ...Issue 2 Spectrum overheating keyboard membraneI think I have an issue 2 ZX Spectrum. I don't want to take it apart again as I had problems replacing the keyboard membrane. With Interface 1 conne…
... between input and output voltage (x current) gets turned into heat ... of cooling plate on the ULA. That chip gets quite hot ...Data bus at interrupt timeIt is "well known" that some peripherals can put values other than 0xff on the data bus at interrupt time, thus meaning that IM2 is slightly more fid…
... 's sole interrupter (the ULA) was not designed for ... these devices attached, the ULA's peripheral id could become ... peripheral ID, like the ULA ID, could therefore be ... single unit in the X direction and the other ... would conflict with the ULA's 255 vector. SP ...Real 60Hz NTSC 48K ZX SpectrumNot a 3rd party mod. The joystick mod was added by the user, but the board and the computer is exactly what was sold in Chile, South America. We migh…
... /NTSC, does it mean their ULA does not do any thing ... NTSC?[/QUOTE]
The ULA is colour-encoder agnostic. It ... , for PAL 312 x 50Hz. Thus the ULA knows about PAL and ...upgrades what you looking for?i start working for upgrades for ZX, but i'm Atari specialist and i don't know exactly what you need for ZX. On the moment i have DIVIDE in stock, an…
... for a set of (16K x 1) DRAM chips. To reach ... RGB and/or VGA output, ULA based on Harlequin project, built ...
