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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…
... Ramsoft incorrectly states that ULA doesn't stop CPU ... [LIST=1]
[*]The ULA address drivers do not open ... I'm curious what exactly ULA is doing then.
In Zx Spectrum 48k the uncontended memory is ... reading from it by ULA. The address while bytefetch ... -
Who has an Issue 1 or Issue 2 Spectrum??Do you have an Issue 1 or 2 Spectrum (ie machines with 5C102E and 5C112E ULA's) ??? You're help is needed! PLEASE SEE THIS THREAD: [url]http://www.…
... or 2 Spectrum (ie machines with 5C102E and 5C112E ULA's) ???
Faulty Spectrum (help requested)I have an issue 6a specci. It's Z80 has the fault m1 line problem (Multiface 128 does not work). So I decided to put in a new Z80 but unfortunately i…
... with a working ULA and Z80 from another Spectrum (issue 4b). So ... different when I power the Spectrum up. But there seems to ... like bad RAM. But the Spectrum worked before I unsoldered the ... . It also seems that the Spectrum is not initializing, because there ...A good site with Z80 ZX Spectrum 48K tunesI found this good site; [url]http://z80.e-demo.pl/[/url] ; I listened to a few tunes yet, and I am [B]AMAZED![/B][B]To me it sounds WAY BETTER THAN A…
... on the net that 48K Spectrum has very poor sound while ... second dedicated Z80 chip and ULA for beeper and so enable ... there were two Z80 and ULA chips that would provide stereo ...A video interface for the Spectrum, MSX compatibleSo you can use the same code for displaying sprites, tiles, characteres, and so no, on both the Spectrum and the MSX. That is, the Spectrum now has a…
... so no, on both the Spectrum and the MSX. That is ... , the Spectrum now has a "dual-screen ... " feature: the well known ULA video output, and a TMS9929 ... to this kind of MSX-Spectrum hybrid, usually in a matter ...128k heat sink - ULA problems and a hintHello, I had two ZX Spectrum 128k with a similar behaviour. One item worked only a short time after switching on and then there were increasing RAM …
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I had two ZX Spectrum 128k with a similar behaviour ... perfectly if I cooled the ULA (with cooling spray). The ... measuring the signals of the ULA I found out that ... the RAS pin of the ULA. Finally I placed a ... even if I heated the ULA with a hair dryer.
How feasible is it to add a second CPU to the ZX Spectrum?Today with IDE, and USB, and TCP/IP and other wonderful technologies arriving on the ZX Spectrum, I'm beginning to wonder if we'll run out of CPU tim…
... technologies arriving on the ZX Spectrum, I'm beginning to wonder ... computational power of the ZX Spectrum. Let me detail the interface ... when neither CPU0 nor the ULA are using it. This ensures ...Spectrum Serial Numbers Wanted!![b]This post updated Sept. 26, 2013[/b] As far as I know, the serial numbering system for the Spectrum has never been fully worked out. For the p…
... serial numbering system for the Spectrum has never been fully ... [CODE]Serial : [xxxxxxxxxxxx] [ colour ]
ULA : [5C012E 5C112E 6C001E-6 6C001E ... ]Serial : 001-62176 white
ULA : 5C102E 8217
CPU : ...Where's the border line between a Spectrum and something else?I mean: there are purists out there that consider that anything that is not a true Sinclair Spectrum, with a true Z80 and a true ULA, and at most, 48…
... Sinclair Spectrum, with a true Z80 and a true ULA, ... the capabilities of the Spectrum, but a joystick interface ... / 128K Spectrums, a "Spectrum compatible machine". Hardware development includes ... and the Pentagon "the ultimate Spectrum" or "the evolution that ...Spectrum dead: 8 vertical bars in alternating colorsI have been soldering on this basterd for a long time now. All IC's now have sockets (except the LM1889). I swapped all 4116's by types that are 100%…
... . Power is 100% ok. Swapped ULA, Z80 and ROM for 100 ... printing area of a ZX Spectrum. The colors are alternating, so ...Repair options for my own dear old Spectrum 48k?Hello all, This is my first post to this wonderful forum, which is part of a truly great website! My name is Arnold, and I live in Utrecht, The Nethe…
... two options in repairing this Spectrum:
One: very simple ... with one from a working Spectrum.
Two: identifying malfunctioning ... measured in a working Spectrum). The ULA gets quite hot in ... at the expense of another Spectrum), get it repaired somewhere, ...Diagnosing Spectrum 48k (faulty RAM chip?)I have a Spectrum 48k (I believe it may be an upgraded 16k model) that doesn't work, and never has ever since the owner gave it to me. When you turn …
I have a Spectrum 48k (I believe it may ... the socketed chips (except the ULA, CPU and ROM since they ..."8 CHANNELS" -ZX Spectrum BEEPER demoHi there. :) We finally managed to finish the BEEPER demo with 8-channels songs. You can get it from here: [url]http://pouet.net/prod.php?which=5…
... -BIT MUSIC-COLLECTION FOR ZX SPECTRUM 48K.
PRESS 1-8 ... .
In hardware way Spectrum 48 has only one channel ... -OUT connector of ZX SPECTRUM (jack) through ULA chip.
ZX ...48k spectrum restarts by itselfFirst of all hello from a newb and thank you for your help. This site has already offered me a lot of insight. I have a 48k spectrum that will boot …
... should be made with the spectrum powered down - unplugged. and indeed ... removed ands re-seated my ULA a couple of times. It ... .blogspot.com/2008/11/zx-spectrum-composite-video-mod.html"]http ... .blogspot.com/2008/11/zx-spectrum-composite-video-mod.html[/URL ...ULA Price Poll - You get to chooseIt is difficult to set the price of the book. If it is too low I will undersell my efforts, too high and I overcharge. So choose what you would be w…
... content not only documents the ULA circuit, but also full details ... able to build their own Spectrum or design their own retro ... Spectrum home computer, the cutting edge technology that was the Ferranti ULA ... own clone of the ZX Spectrum.
[/quote ...Earliest ULA datecode ??I'm on a mission to find the earliest ULA datecode. Ie, when the first batch of ULA's were manufactured. The earliest picture of the Spectrum circu…
... mission to find the earliest ULA datecode. Ie, when the first ... ULA's were manufactured.
The earliest picture of the Spectrum ... from the top of the ULA - and Sinclair may have in ... />
The earliest issue 1 ULA datecode I have is 8217 ...Spectrum+ from ebayI recently received a Spectrum+ that I bought off ebay for about ?10 including postage. I have not tested it yet but had a quick look inside through …
I recently received a Spectrum+ that I bought off ebay ... and have repaired many a Spectrum (and most of the other ... can remember. Spectrums were all ULA, transistor and RAM faults, or ...+2A extended memory map & ULA bug?The [URL="http://www.worldofspectrum.org/faq/reference/128kreference.htm"]128K reference page[/URL] says: [quote]The ULA bug which causes snow when I…
... [/URL] says:
[quote]The ULA bug which causes snow when ... />
Will the ULA bug appear on the Spectrum +2A if I ...Spectrum hangs upWhat might be problem when my ZX Spectrum 48K (rubber keys) hangs up after few minutes play? It had memory problems but i changed (or an expert did i…
... be problem when my ZX Spectrum 48K (rubber keys) hangs up ... OK. Also ULA is OK (i tested it in another Spectrum).
Help with broken SpectrumHi There, Just received a ZX Spectrum computer. It's an issue 3B (48k version). When I power it up (9V centre pin -V) nothing happens. It's complete…
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Just received a ZX Spectrum computer. It's an issue ... OK (perfect 5V).
The ULA gets a bit hot. Other ...How looks a Spectrum shown in a TFT VGA monitor?Some people has just asked me if a cheap Dealextreme VGA Box is capable of showing a decent picture from a ZX Spectrum. Well, I've just modded one r…
... decent picture from a ZX Spectrum.
Well, I ... just modded one rubber-key Spectrum for composite video output option ... just after switching on the Spectrum. No params have been ... , without artifacts, other than ULA and composite video artifacts.
ZX spectrum 48K ULAhi everyone I WANT a 48K working ULA. My one needs replacing.. Thanks
hi everyone
I WANT a 48K working ULA. My one needs replacing..
ThanksBroken keyboard due to broken ULARecalling csmith's thread about dead ULAs, a thread appeared in the Zonadepruebas (Spanish) forum regarding... a dead ULA, but only a partially dead …
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[quote]
Today this Spectrum arrived and I could show ... to life.
"Another ULA knackered!" I thought...but... how ... of the ULA.
So I tested the Spectrum with my ... the right parts of the Spectrum's motherboard. Since I didn ...PoC for a ULA video generator described using Handel-C and a Basys FPGA board.Recently, I've taken a course about hardware design for video processing using FPGA's. The HDL used in the course was Handel-C, a C look alike langua…
... write a description of the ULA behaviour when generating video (not ... of 14MHz of the original ULA) .
The result ... one of them is the ULA video generation FSM, which in ... program running in a emulated Spectrum using Spectaculator, configured with CPU ...ZX Spectrum 48K,issue two - can't get it repairedI have an issue 2, which has some weird very small PCB hanging over the Z80. Some wire go to various places on the big PCB, two go to connections 36 …
... 36 and 37 of the ULA.
Replaced TR4 and ... end it pages in the Spectrum ROM, but it's illegible ... say:
Z80 = working
ULA = working (type is 5C102E)
ZX Spectrum 48K, issue - works fine till it gets hot (?)ZX Spectrum 48K, issue 2, works just fine, tested with Winston's diag board. At a certain moment in time however, it seems to run hot and stalls. Whe…
ZX Spectrum 48K, issue 2, works just ... .
Voltage regulator and ULA both get very hot, but ...How the spectrum generates the video from ramHi everyon, I know that most people here allready know this but i think i found out how the spectrum acctually dispalys stuff and why the LD x, (HL)…
... i found out how the spectrum acctually dispalys stuff and why ... .....But wait!!!
The spectrum has its lower 16K separated ... order ram (> 16K) the ULA (or PIC in my case ...ZX spectrum +2 issue3 (gray) videoout problemHi! Have distorted flickering image on ZX spectrum +2 gray issue3. RGB connection thru sony CXA rgb->svideo coder (Good quality! but flickering) [ur…
... distorted flickering image on ZX spectrum +2 gray issue3.
spectrum?
How can I repair ... /plus2sch.png[/url]
ULA sync malfunction?Smooth (vertical) scrolling on ZX SpectrumI was just thinking about this. You know, you have systems like Atari 2600 or Sega SG-1000 that have no hardware scroll, but they have games that sti…
... ).
How come ZX Spectrum games have all jerky scrolling ... to do the tricks within ULA display time.
I ... that, I am sure the Spectrum can as well.
Wanted: Rubber Key 48K M/board or ULAI have a spectrum that isn't too happy. It seems to be a problem with the ULA... So, has anyone got a spare working motherboard that'll fit in my ca…
I have a spectrum that isn't too happy. ... be a problem with the ULA...
So, has anyone got ... in my case, or a ULA for a 3b revision? I ... .
The current ULA has Ferranti ULA 6C001E-6 / 8351 stamped ...
