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MicroDrive ULA replacement - best way?I have a mirodrive playing up, odd motor sound, sometimes it reads ok sometimes not. Just wondering if its worth replacing the ULA in it, and whats …
... if its worth replacing the ULA in it, and whats the ... a look. I have a ULA chip about the place.
ULA Schematics CompleteHi all. Just a note to say that I have finally produced some readable schematics for the 48K ULA :-) I've also uploaded a few pages from the book -…
... readable schematics for the 48K ULA :-)
I've also ...A typical sprite listing to analyse, please?Hi all, Would anyone be interested in helping out with my ongoing Assembly studies by posting up, posting a link to or mailing me a typical sprite l…
... to or mailing me a typical sprite listing to analyse? :roll ...Where: ZX Printer ULA's and ZX interface I ULA'sIs there any source left for these ULA's? Alot of tings can be replaced, like the ZTX transistors and occasionally you can come accross a normal ZX S…
Is there any source left for these ULA's? Alot of tings can be replaced, like the ZTX transistors and occasionally you can come accross a normal ZX Spectrum ULA, but I have never seen these anywhere?ULA Hacks?During some of my madder experiments back in the 80's I discovered some interesting ULA hacks such as being able to read the raster position through …
... 's I discovered some interesting ULA hacks such as being able ... because I knew that the ULA kept changing and I would ...Can ULA kill other componentsIn my search for a problem I used a ULA6C001E-7 on a board that had a ULA6C00IE-6 chip. Q1) Should this have worked? Q2) After this experiment both …
ULA Plus and Interlace.May be a bit late to suggest this, but here goes. Did the original Speccy ULA actually output a proper PAL interlaced image, with timing pulses on a…
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Did the original Speccy ULA actually output a proper PAL ... frame?
Now, does ULA Plus generate a proper interlaced ...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 ... of the Ferranti ULA range, images of the 6C001 ... ULA internals, both optical and scanning ... technology that was the Ferranti ULA, or the principles and techniques ...ULA equivalent?Gives it an ULA equivalent for the ZX 48K? Or not because the ULA is a custom chip. Micky
Gives it an ULA equivalent for the ZX 48K? Or not because the ULA is a custom chip.
MickyEarliest 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 ... batch of ULA's were manufactured.
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 …
... remember. Spectrums were all ULA, transistor and RAM faults, or combinations thereof ... . Anyone had experience of CPU related faults?.ZX 48K issue 4a with ULA 5?I got a ZX 48K PCB. It works but it has a ULA 5. I thought on the issue 4a is a ULA 6 or later. Micky
I got a ZX 48K PCB. It works but it has a ULA 5. I thought on the issue 4a is a ULA 6 or later.
Micky+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 ...+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 ... .[/quote]
Will the ULA bug appear on the Spectrum ...48 Issue 3b working but very hot ula and cpuSalve to everybody I bought from e*ay an Issue 3b 48k , fitted in a + case. Fixed the keyboard problem with a new keyboard membrane from good Rwap (w…
... characters. BUT I noticed that Ula is very hot and the ... for fetishism I added to Ula and Z80 two mini heatsinks ...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…
... of common hardware faults, e.g. an aging ULA or other components ...ULA BookI've just had an email stating that my ULA book is "in the post" - yay! Well done Mr Smith for all the hard work on this.
I've just had an email stating that my ULA book is "in the post" - yay! Well done Mr Smith for all the hard work on this.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 ... my head, with a working ULA (subsequently tested on another speccy ... Sinclair selling 48KB machines with faults as 16KB machines, as ... time taken to troubleshoot such faults wasnt economically viable so they ...ula bookula book is here: [url]http://www.zxdesign.info/book/[/url] can i post sam coupe stuff here - she kind of is a speccy if you stuff the speccy rom i…
ula book is here:
[ ... you
was readinfg the ula book and this is not ... described as ula snow - the description of that ... which is what i thought ula snow was whereas that is ...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…
... , a couple have developed ram faults probably due to other aging ... to custom chips like the ULA when they get old? Will ...zx spectrum ULAis the ULA in the 16K the same as in the 48K could you take the 16K ULA and place it in a 48K I ask this because i have a speccy thats dogy with th…
is the ULA in the 16K the same as in the 48K
could you take the 16K ULA and place it in a 48K
I ask this because i have a speccy thats dogy with the graphics and my 16K has keyboard issues
thanksZX 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 …
... (Spanish) forum regarding... a dead ULA, but only a partially dead ... to life.
"Another ULA knackered!" I thought...but... how ... The only solution: bypass the ULA. That's to say disconnect ... to read something from the ULA. This combination (the most ...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 is ... : one of them is the ULA video generation FSM, which in ...Which ULA for which issue?Which ULA is for which issue? Is there a standard? Micky
Which ULA is for which issue? Is there a standard?
Micky+3 ULA question.I have a +3 and a DivIDE+ unit. Another user has suggested that the reason the DivIDE+ doesn't work on the +3 is that the ULA may be dud. I have trie…
... the +3 is that the ULA may be dud. I have ... can get a replcaement +3 ULA from? I have been told ... a +3, what about 128K ULA or +2 ...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…
... 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 ...ZX Microdrive errorToday I started some ZX Microdrive having in the closet, and only one has given me problems with the typical [B]Microdrive Not present[/B] error. As …
... given me problems with the typical [B]Microdrive Not present[/B ... there is no problem of ULA and the motor starts, I ...Chris Smith's ULA talk - live today (Sat Jul 23) 4pm BSTChris Smith's talk on the Spectrum ULA at Euskal Encounter will be broadcast live today on the Basque country public TV's website! Sorry about the sh…
... 's talk on the Spectrum ULA at Euskal Encounter will be ... , and the second about the ULA and its reverse engineering.
