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Why only 2 colors ?Maybe this question dont go on this part of the forum, but dont know what other part to ask. Why the Spectrum only can show 2 colors at time in the …
... memory. Maybe not the same ULA ?
Do you really ... -
So you need to double (or triple, or quadruple) the clock speed...No particular reason for posting this, other than I was looking at an eZ80 evaluation board that does this, and that jogged my memory of a project I'…
... 14MHz clock that drives the ULA... so I think for anyone ... -
testing if speccy is fully functionalHi, There is so much mention of T states but still confused. Does this mean if an instructin is out by a T-state or more then the speccy is faulty?…
... to check the CRC of ULA, the basic rom and the ... that checks the basic rom, ULA, and Z80 processor and memory ... -
Hypothetically....If you were putting together a "Spectrum +4" what presently available hardware would you include. My criteria would be total comparability (or as ne…
... a single chip or new ULA's, extra RAM or anything ... -
VCF report and photosNot sure where to put this, exactly...but here it is, what went on at the Vintage Computing Festival at Bletchley Park last weekend. Finally I've fo…
... and faithful to the 48K ULA - all the timings and other ... effects of the ULA are the same.
RFC: ZXI hardware interface standardisationReposted from c.s.s to reach a wider audience [QUOTE=Andrew Owen] You may have noticed that there are more people making add-ons for the Speccy than…
... how bad it is, the ULA uses 32768 ports. Most of ...Summer express game competetionHello to all. I would like announce SUMMER EXPRESS GAME COMPETETION: [B]Theme:[/B] a game [B]Deadline:[/B] 1st September 2010 [B]Target:[/B] ZX Spe…
... :[/B] ZX Spectrum 48 + AY (ULA+ allowed)
[B]Rules ... is 48K zx with AY (ULA+ allowed)
5) Basic, authoring ...LDIR timings in contended RAM?The 48K Spectrum technical reference page ([URL="http://www.worldofspectrum.org/faq/reference/48kreference.htm"]here[/URL]) describes the detailed ti…
... have to wait for the ULA to release the wait state ... ]next[/I] gap in the ULA wait states before it can ...RGB to VGA convertor for ZX128/+2/+2A/+3David Luftner release source code (VHDL) of SCANDOUBLER for ZX128/ZX128+2/+2A/+3: [url]http://velesoft.speccy.cz/other/scandoubler-for-zx128_fixed_by…
... .4690 MHz from ZX board. ( ULA chip use 17.7345 MHz ...Issue 2 issue (...)Just acquired an issue 2 Spectrum 48 K, selled as working board, not working keyboard. Before testing it with a psu I opened the case and discovered …
... on z80 side facing the ula) just at the transistor plastic ... Service Manual that, related to ula 5c112 timing problems, speaks about ...Picture interference on red areas.I recently got a 48K Speccy off eBay, did a composite mode and it seemed to work OK, but then my TV had to go off for repair so I didn't use it for a…
... faults, e.g. an aging ULA or other components?ZX ULA Book releaseThe book is complete and with the printer. Once the proof copy is back and checked, and assuming no changes are required, I'll start shipping all you…
The book is complete and with the printer.
Once the proof copy is back and checked, and assuming no changes are required, I'll start shipping all your pre-orders.
It's been an effort like no other I've experienced!
To keep ...New stereo audio board for fitting on AY chip - interested?Hi, I developed a small board that fits on the AY chip inside 128K ZX Spectrums: [IMG]http://www.benophetinternet.nl/hobby/vanmezelf/stereo_audio.j…
... beeper sound right off the ULA or from the sound output ...Things I'd ask Chris Smith if he would give an interview about his book and researchGiven your current knowledge about the ULA interns, knowing what technology was capable to do those days, and knowing what people then and now would …
... your current knowledge about the ULA interns, knowing what technology was ... been possible using the same ULA model? In other words, would ... sprites, fit into a 6C001E ULA device? Did Altwasser push the ... ULA to its limits? Have you ...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…
... that everything is OK. Also ULA is OK (i tested it ...48K Speccy Repair Log.Some people may know my love for writing up my repairs of arcade PCBs on various forums so thought I would do the same for this little fella. Had th…
... with these machines is the ULA chip, the only custom chip ... my head, with a working ULA (subsequently tested on another speccy ...The Sadness of my Decaying Speccies.I've been avidly collecting ZX Spectrums since the late 90's and whilst at the time of the late 90's and early millennium my Spectrums and associated…
... to custom chips like the ULA when they get old? Will ...128 port hardware patchReading the ULA book has reminded me of something. In The Spectrum Hardware Manual (Adrian Dickens) there is a hardware patch to allow free use of al…
Reading the ULA book has reminded me of ... the CPU to fix a ULA bug (p71). The following diagram ... hardware patch that disables the ULA when A7=0?
Ta ...+3 issues....Hello All I came by a couple of +3's on ebay and I'm having issues with them. Since I only ever owned a rubber key, thought someone might be able to…
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…
... OK (perfect 5V).
The ULA gets a bit hot. Other ...emulatorsplease help can we see clearly which emulator emaulates which hardware is there any that has a pc function key for the mulitface nmi button and the +…
... only 81 had pretty convincing ula interference but now dot crawl ... and ula snow - though these are not ... reader please help
the ula+ is only for the harlequin ... time or with the spectrum ula a whole third of the ...Memory upgradeHi! I bought a 16K rubber key Spectrum. It's said in the box and memory test program also said it's 16K machine. Strange thing is that there is yell…
... also 4 empty sockets between ULA and Z80.
My question ...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…
... plain, without artifacts, other than ULA and composite video artifacts.
SpecEmu 2.9I've been taking the latest versions of SpecEmu from the ULA Plus web site as and when they've been appearing, but the latest one (build 15/08/10) se…
... versions of SpecEmu from the ULA Plus web site as and ...Do ULAs die?Thought I'd start this thread as people often think their ULA is dead, when it's actually the RAM or power circuits. Searching the forum in the futur…
... as people often think their ULA is dead, when it's ... I've never known a ULA to die.[/i]
ULA on a breadboard with the ...VIC 20 on the SpectrumThe original "20 Commodes" program released for CSSCGC 2008 has been improved and now has its own entry in WoS. The improved code has been sitting on…
... more boxes :
1) ULA-II support to show those ...Question about ZX81 componentAfter I cleaned and replaced some components (7805, two electrolytic caps) with fresh ones, and replaced the RF board with a composite one, on an iss…
... is right next to the ULA the screen was coming back ...Interesting AuctionCheck out the speccy with a 'bank' of LEDs and the Atic Atac Poster. [url]http://cgi.ebay.com/SInclair-ZX-Spectrum-lot-parts-books-ula-feet-etc-/270…
Check out the speccy with a 'bank' of LEDs and the Atic Atac Poster.
[url]http://cgi.ebay.com/SInclair-ZX-Spectrum-lot-parts-books-ula-feet-etc-/270675478234?pt=UK_VintageComputing_RL&hash=item3f058406da[/url]FS: My 48kIve decided to sell my personal, everyday 48k rubber key, reason being ive recently took delivery of another but this has nearly everything on the bo…
... ), new membrane and now working ULA in it (as supplied and ...
