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ZX Spectrum Woes...In my endeavours to get my second Spectrum (Issue 3) working I have replaced the CPU, memory and lower ram. I have fitted sockets for the CPU and me…
... endeavours to get my second Spectrum (Issue 3) working I have ... signal provided by the ULA is the 14MHz ULA clock signal divided ... shows pin 32 of the ULA as high and pin 6 ... wave. Pin 39 of the ULA is permanently high, although the ... -
Memory upgrade for ZX Spectrum 16/48This is external memory upgrade for ZX Spectrum models with 16kB ram. Can be connect also to 48kB models, but need remove 8 dram chips (from sockets …
... external memory upgrade for ZX Spectrum models with 16kB ram. Can ... 32768-65535 in your ZX Spectrum
+ memory upgrade to 48kB ... external ram pages are fast (ULA no slow down CPU and ... -
ZX Spectrum 48k issue 3b power problem?Hi :) I was lucky enough to find a couple of ZX Spectrums at a car boot sale yesterday. I spent the evening fiddling about with one (issue 2) and t…
... when I turn on this spectrum, the copyright screen comes on ... up at all, including the ULA. Im wondering if this is ... -
Spectrum+ fault - lines on boot screen, freezesThe ZX Spectrum+ I bought in the car boot has a fault. When you boot it, it's displaying the Copyright screen, but each character position has a vert…
The ZX Spectrum+ I bought in the car ... from a broken Issue 2 Spectrum (the problem was missing -5V ... I don't think the ULA had any reason to be ... works... so that means the Spectrum+'s keyboard is faulty :/ - or ... it just be that the ULA isn't suitable for it ... -
csmith talks about games/ULA book on EITBHere is what looks like a very rough edit, courtesy of EITB (Basque country TV) with Chris Smith about the ULA book and game engines of back in the d…
... ) with Chris Smith about the ULA book and game engines of ... expert in both the ZX Spectrum architecture and game engines Chris ... architecture of the Sinclair ZX Spectrum, which brought a great deal ... -
Spectrum + and +3 Bath! Including SEXY photos!Continuing my "bath" projects: Today I repaired a 48K Spectrum + to working condition, an Issue 4 that is nice and stable. Took 4x Spectrums+ apart …
... /> Today I repaired a 48K Spectrum + to working condition, an ... /> Todays completed Spectrums:
Spectrum+ and the +3
The ...
This shot, of the Spectrum+, shows how the membrane is ... ensure longer life of the ULA and Z80.
[ ... -
Spectrum +128K Toaster Rack & a skanky Spectrum +2A Bath - Incl. naked pictures!Ok, so today was another productive day to complete 2x Spectrums with their baths and assembly. One fat and grey +2A and one sleek sexy 128K The grey…
... />
The Spectrum +2A:
[IMG]http ... />
The Spectrum 128K Toaster Rack version:
ULA!
[IMG]http://i1193 ... -
Dead Spectrum+Hi! Any suggestions where to start finding what's broken: Spectrum+ with issue 6A motherboard and nothing on TV. Top row of the upper memory chips g…
... finding what's broken:
Spectrum+ with issue 6A motherboard and ... hot (all 4) and also ULA. Regulator (7805CV) don't heat ... -
Repairing another Issue 2 48K Spectrum.I said at the start of the other thread that I've got another one of these and I've started investigating it. The board is more-or-less exactly the …
... on the other Issue 2 Spectrum.
A resistance measurement ... they were exactly the same. ULA unplugged, I applied power again ... same as before and the Spectrum was drawing 240mA at 9V ... -
divIDE x Spectrum clonesAnyone has a Spectrum clone and did a test with divIDE? Here in Brazil we have 2 Spectrum clones (TK90X and TK95) that are almost 95-99% compatible w…
Anyone has a Spectrum clone and did a test ... in Brazil we have 2 Spectrum clones (TK90X and TK95) that ... know that our ROM and ULA are slightly different of the ... -
4116 SRAM replacement (and ULA timings).As mentioned in another thread, I have spent quite a lot of time experimenting with different circuits and components for using a static RAM IC to re…
... perfectly with a 5C112E ULA. I have just been ... prototype with an Issue 2 Spectrum and different ULAs. It ... their native (version 6) ULA happened to be.
... much more severe as the ULA (I assume) warms up ... makes me think the ULA must sometimes wrongly read ... -
Experiments mixing ULA+ and Timex Hicolour featuresI'm trying to improve my Verilog skills, so I've written a description of a complete ZX Spectrum 128K (+2 grey ROMs), with AY-3-8912. I wanted to add…
... description of a complete ZX Spectrum 128K (+2 grey ROMs), with ... -8912. I wanted to add ULA+ support, and in the way ... been used to implement the ULA+ palette registers.
I ... to add this to the ULA+ page, if you wish ... -
Faulty Grey Spectrum +2 - help neededI have a faulty spectrum +2. I tested the voltaged inside - all check fine. Well, within some limit, +5 for example is 4.83, but all other voltages a…
I have a faulty spectrum +2. I tested the voltaged ... .
I cannot swap ULA because i don't have ... . I don't know is ULA for toastrack 128K is the ... are fine. What's left? ULA and RAM.
Cannot test ... ULA and how not idea how ... -
ULA bug and snowI am tryng to improve the snow emulation in FBZX wii but I do not have a real spectrum to test the results. I used the information taken from Harele…
... do not have a real spectrum to test the results.
ULA video register the second screen ... -
ULA chipHi, Does anyone have an ULA chip for a Spectrum 48K issue 2 for sale?
Hi,
Does anyone have an ULA chip for a Spectrum 48K issue 2 for sale? -
Spectrum+ and dead keyboardI have a Spectrum+ which had no picture just snow on TV. I found instructions, that it might be regulator 7805, so I changed it. Now I saw something …
I have a Spectrum+ which had no picture just ... TV when I booted up Spectrum. Instructions said that now try ... . So i tried another keyboards (Spectrum+ and DK'Tronics) which are ... , which said it might be ULA, so I changed it, but ... -
Stealth AllRAM SpectrumHaving just received a couple of new keyboard membranes to fix a couple of machines with, the thought crossed me that I should do a special project w…
...
1. Remove the 16K Spectrum ROM
2. Replace it ... people cry. This new 64K Spectrum - how the hell does ... its original ROM - the Spectrum's PCB is not ... a read pin. The Spectrum ROM has two chip ... generated by the ULA, Chris Smith's ULA book shows it ... -
Revisiting Spectrum CPU clock regenerationWarning: This post will be a bit nerdy :-) Some time ago, I experimented with phase locked loop circuits as a possible way to regenerate the Spectru…
... PLL would nicely regenerate the Spectrum's clock signal despite ... 3.5MHz clock as the ULA generates it internally, and ... to the simulation - one counting Spectrum clock cycles since contention started ... in perfect sync with the ULA only about halfway across ... -
Semi-Dead Spectrum - Help RequestedI have finally got my hands on my two old Spectrums - neither of which work, but ideally I hope to get both of them working again. Spectrum number o…
... them working again.
Spectrum number one is a Plus ... , and an Issue 7 ULA.
Spectrum number two is an ... issue 3 with an Issue 6 ULA ... the Voltage Regulator and the Spectrum now "boots" correctly. It displays ... -
THE ULA CHIPDoes anyone know which the ULA chip is in Spectrum +2 ?
Does anyone know which the ULA chip is in Spectrum +2 ? -
Microdrive without interface 1 on a Spectrum +2The [B]divide [/B]is not compatible with the interface 1. however, I would like to use the microdrive on a Spectrum +2. it would be possible to recre…
... use the microdrive on a Spectrum +2.
it would be ... in the interface 1 without ULA?
or someone has an ... Microdrive without interface 1 on Spectrum +2? -
New colors / switchable color palette with regular ULA ?Hello. This may be an ignorant question but I just thought about it today and wanted to post it here to get some opinions. OK, so, today, while goin…
... /> Tonight I looked at the Spectrum Hardware Manual and found out ... question are handled by the ULA.
Any comments? :D -
Lot's of ZX Spectrum parts: RAM chips, ULA's, etcI have new stock of 100% tested parts. I even got my hands on a bunch of ULA's!! [IMG]http://benophetinternet.nl/hobby/sales/parts/IMG_6068.JPG[/IMG…
... hands on a bunch of ULA's!!
[IMG]http ... [/B]
- 48K / 128K ULA
- Zilog Z80 3.5 ... -
Designing a Modern 'Professional' low cost ZX Spectrum ??Hi, I'm looking at designing a low cost hight performance (20MHz) ZX Spectrum... in the mould of the original, but using modern-day components. The…
... cost hight performance (20MHz) ZX Spectrum... in the mould of the ... or two as glue logic+ULA etc)
V9958 Video IC ... -
Dataline check on Spectrum 128k +2 greyhi all according with this [url]http://tcg.speccy.cz/zoom/pics/plus2sch.png[/url] R22 pin goes to A14 wich is pin 43 of ULA and pin 4 of Z80 bu…
... ULA and pin 4 of Z80
but on my spectrum ... and not pin 43 of ULA
some broken here ... -
Improving Composite Output of 48K SpectrumI've been playing around with this Spectrum 48k I got inside a dK'tronics keyboard, because well I've already got two working other ones so why not..…
... been playing around with this Spectrum 48k I got inside a ... .co.uk/2011/10/zx-spectrum-48k-composite-video-mod.html ... at the output of the ULA luminance pin, the noise is ... -
SPECTRA - RGB SCART Interface for 48K SpectrumSince the launch of the SPECTRA interface back in June 2012, some discussion of it has appeared in the forums in the past (mainly [URL="http://www.wo…
... from a 128K Spectrum. The Spectrum?s sound is ... fruitcake.plus.com/Sinclair/Spectrum/Spectra/Images/Screenshots/ ... fruitcake.plus.com/Sinclair/Spectrum/Spectra/Images/Screenshots/MyNeighborTotoro_4x1_DE ... implement support for the ULA+ specification and it is ... -
Poorly Issue One 16k spectrum diagnosis?Hello, everyone. :smile: I was lucky enough to buy an Issue One 16k rubber key the other week; I didn't know it was an Issue One till I opened it up…
... wrong with this one. The Spectrum as it stands now is ... distinct buzzing sound from the Spectrum (not the speaker) when it ... diagnosis:
1. The ULA is good, since I have ... 't want to modify this Spectrum too much, I can see ... -
Spectrum FPGA clone with HDMI video output by Jozsef LaszloThis clone is based upon the ULA core I wrote for opencores.org . It features a scandoubler and HDMI conversion engine. Jozsef has found that a 28MHz…
... clone is based upon the ULA core I wrote for opencores ... timmings as in the standard Spectrum, without the need of double ... -
Corrupt paper on zx spectrum 48kHi. When I power up my spectrum (issue 3) I get the light grey border, but the paper is black and it switches between thin red vertical lines and thi…
... . When I power up my spectrum (issue 3) I get the ... . Could it be a defect ULA, or one of the RAM ...
