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Is there any video input on expansion bus?Imagine you want to build a custom display hardware, for instance, to add hardware sprites to display. Is it possible to design such a device so that…
Imagine you want to build a custom display hardware, for instance, to add hardware sprites to display. Is it possible to design such a device so that the video signal can go into Spectrum, ULA and then to standard RF socket? -
Someone can help me to fix my Zx Spectrum?I did a video about the startup: [url]http://dl.dropbox.com/u/1566495/ZXSPECTRUM03.mp4[/url] I have replaced the ULA with a working one (same proble…
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I have replaced the ULA with a working one (same ... -
Have a real 48k Speccy? yes ? I need your help.Im looking to run this quick test on as many [COLOR="Red"](only)[/COLOR] 48k Spectrums as possible [B][COLOR="Red"]files moved[/COLOR][/B] [URL="ht…
... the board issue, the CPU, ULA you have inside please report ... ="red"]Zilog Z80A[/COLOR]
ULA: [COLOR="red"]6C001E-7[/COLOR ... -
Static vs stacked local variables in z88dkHello everyone. I'm doing a program for Spectrum 48KB with z88dk v1.8 (XX Mar 2008), and I eventually discovered that if your local variables in fun…
... address 32768, far from the ULA's hands, while the stack ... -
Timex 2048 documentsHi, I got Timex 2048, seems to work, but no colors on screen :cry:. Neither TV out, nor Composite works. ULA fault ? It seems TC 2048 uses MC 1377 a…
... TV out, nor Composite works. ULA fault ?
It seems TC ... -
Tricks with IN 31It's generally considered unwise to use a Kempston joystick's fire button to start a game, because the floating bus effect can make arbitrary data ap…
... read IN 31 while the ULA is still drawing the upper ... -
Fixed schematic of zx128+2 (grey)This is new fixed schematic of ZX Spectrum 128+2 (grey model) [url]http://velesoft.speccy.cz/other/zx128plus2-iss3-schematic%28corrected_v01%29.png[/…
... and absent signal IORQGE in ULA part....
This is ... -
OMD at the Vintage Computing FestivalJust got this via Farcebook: (Also add to the list of speakers our very own [B]csmith[/B] on the Spectrum ULA) NEWS RELEASE A walk on the geek side …
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 …
... can remember. Spectrums were all ULA, transistor and RAM faults, or ...+3 FaultsI have some Spectrum +3s for testing - looks like they all need drive belts. One will not start up and shows a screen of yellowy green, then one of …
... . Ah I thought - maybe the ULA - the other +3's case ...Re-inventing the wheel......TROOPER: POINT 5 First an apology, my level design sucks (well I'm not happy with it) so Trooper is taking an age to do. Anyway this game comes …
... , I ws thinking of a ULA+ version but the loading screen ...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 ...
