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ZX81 ULA Swap questionHi Can someone remind me if all three versions of the ZX81 ULA are electrically compatible? I just bought a ZX81 with an older ULA, so it lacks the …
... three versions of the ZX81 ULA are electrically compatible? I just ... a ZX81 with an older ULA, so it lacks the backporch ... happen to have a good ULA 2C210E. Can I simply swap ... -
Spectrum +2 (grey) RAM issueHi, I?ve got a ZX Spectrum +2 (grey) with what I think is a RAM issue. I used to be able to load games very reliably by playing converted TAPs and …
... I think is a RAM issue.
I used to ... RAM page 5 has an issue.
Here?s a ... same time? It's an Issue 3 PCB.
[I ... being incorrectly mounted on the Issue 3 PCB. I can't ... -
What influence the number of stripes during initialization?Hi for All! After some adventures, with other rare old computers I'm back here to my favourite forum. :) Recently I got some ISSUE 2 boards from Ben…
... stripes. One of the ISSUE 2 boards initializes also that ... it depends on the ULA type, but there are ... have the same 5C112E-3 ULA (dated 8314). One shows ... As I exchanged the ULA between the boards the number ... same board, so my "ULA dependence theory" seems to be ... -
Issue 3 /3b power rail improvements<!--[if gte mso 9]><xml> <o:OfficeDocumentSettings> <o:AllowPNG/> </o:OfficeDocumentSettings> </xml><![endif]--> <p class="MsoNormal">Hi F…
... /> I have seen the odd issue 3 and 3b’s with ... will be?I have an issue 3 I trying to get ... -
Spectrum Show Magazine Issue 6Issue 6 of The Spectrum Show Magazine is now available from my blog (see sig).
Issue 6 of The Spectrum Show Magazine is now available from my blog (see sig). -
ZX81 Composite Mod<p>I've done a simple composite mod to my Issue 3 ZX81 following a basic schematic I found on one of the ZX81 forums. Mod consists of a BC547, 1…
... simple composite mod to my Issue 3 ZX81 following a basic ... input from Pin16 of the ULA, 5V, ground and a video ... -
Interface 1 repair?Can the Interface 1 be repaired? The problem is that it is not recognised by (several) Spectrums, including ones that it worked on the last time I t…
... activity.
Is this a ULA issue in the interface?
Can ... -
ZX Spectrum issue 2 has only blue tintsRecently I've bought a 16k speccy and ran into some issues with it. Faulty keyboard, broken caps, no stable frequency, faulty lower RAM chip, it bein…
... have the blue tint issue and loading issue. From the research I ... could be because of another issue (or that I'm just ... luck)
The not loading issue might be because of a ... -
Not bored with the Boards.Going through some old tapes stored rather badly I came across an unlikely item that that I must have stored away quickly with other low grade items …
... . I had never had an Issue 2 Spectrum which is probably ... kind of "reference" item .This Issue 2 board is largely depopulated ... video modulator ripped out , the ULA and ROM missing as well ... -
Replacement speakers for 16/48K SpectrumsThought I'd share a source of replacement speakers for the 16/48K machines: http://uk.rs-online.com/web/p/miniature-speakers/7903975/ (Equivalent…
... diameter as the speakers in Issue 3 and above machines,and ... />
Note: The speakers in Issue 1/2 Spectrums are 200 ... are driven directly from the ULA (no TR7), so if fitting ... series to avoid loading the ULA ear/mic pin too much ... -
No colour - Issue 2 SpectrumThis one is driving me mad - any suggestions appreciated. I have an issue 2 Spectrum with no colour at all. I found the 12v rail was at just over …
... .
I have an issue 2 Spectrum with no colour ... testing them on a different issue 2 board to verify it ... 't have a fully working issue 2 board to check against ... -
SAM Revival magazine issue 25 now out!It's finally out! * SAM Revival issue 25 - 56 pages packed with SAM Coupe goodies for the 25th Anniversary of the computer. * Brand new SAM Robot…
... out!
* SAM Revival issue 25 - 56 pages packed with ... up this gigantic 56 page issue of the magazine.
SAM Revival issue 25 comes with not just ... ... Hmmmm!
SAM Revival issue 25 costs £4.99 with ... -
ULA Replacement??I searched, but maybe I just missed it. Has there (or is there) anyone working on a ULA replacement either as an FPGA or CPLD package? Or, perhap…
I searched, but maybe I just missed it.
Has there (or is there) anyone working on a ULA replacement either as an FPGA or CPLD package? Or, perhaps something else such as a microcontroller?
Thanks -
Issue 1 schematics?I'm fault-finding an issue 1 board. So far I've found a hot memory chip and snipped it's supply legs, then swapped the burnt-out 7805 for a switched…
I'm fault-finding an issue 1 board. So far I' ... -
Faulty Issue 1Hi all, thought I'd document my efforts in getting another speccy working. I've never done this before so please bear with me... I recently took a p…
... .worldofspectrum.org/forums/discussion/51557/issue-1-schematics#latest"]here[/url ... (are these compatible with this issue - coz they ain't what ... is that compatible with the Issue 1 motherboard? -
Wanted 6C001E-7 ULALooking to replace mine from a issue 4B, anyone got a working one spare in a bag of bits or know where I can get one?
Looking to replace mine from a issue 4B, anyone got a working one spare in a bag of bits or know where I can get one? -
FREE to a good home: Crash issue 66Was having a clear out and I found a copy of Crash issue 66, July 1989. It doesn't have the cover tape and is in reasonable condition with no major t…
Was having a clear out and I found a copy of Crash issue 66, July 1989. It doesn't have the cover tape and is in reasonable condition with no major tears but some signs of wear. Does anybody want it? If so, pop me your address in a pm. -
No colors on screen, issue 2.I have a 48k issue 2 with composite mod. When i first pluged it in after i bought it, the screen went yellow and after restart there were no colors a…
I have a 48k issue 2 with composite mod. When ... -
Dead issue 3b with black and white barsHi all, I've been donated an issue 3b which has some nice black and white bars with a few flashing blocks. I've done a few RAM tests and could spo…
... /> I've been donated an issue 3b which has some nice ... -
Issue 6a - no soundHi all I get from ebay one issue 6a, Burned 7805, ztx 650 After this all look fine, zx diagnostic board pass mem test but not have sound, i change…
... /> I get from ebay one issue 6a,
Burned 7805, ztx ... -
Bizarre ZX Spectrum faults (also possibly relevant to Spectranet compatibility problems).I'm attempting to repair an issue 4A 48K ZX Spectrum and am encountering some very strange problems. For my own records I've given this computer the …
... 'm attempting to repair an issue 4A 48K ZX Spectrum and ... another 6C001E-7 ULA, taken from a working issue 6 Spectrum. The ... . The issue 6 Spectrum functioned perfectly when fitted with the ULA from ... so long as a Spectrum ULA is not faulty, it has ... -
Spectrum ISSUE 5 exists - picture attachedIt has been published in the spanish va-de-retro forum by the user "eltargui". He repaired the computer two years ago and took this picture but he ha…
... /tyxciald25xekjd/Issue5small.jpg?dl=0"]ISSUE 5 small[/url]
[url ... /fxvdpw7oe5yerj5/Issue5.jpg?dl=0"]ISSUE 5 Higher resolution[/url]
Spectrum Show Magazine Issue 10Tenth issue [url="http://www.thespectrumshow.webspace.virginmedia.com/DL/SpeccyMag10.pdf"]available to download[/url].
Tenth issue [url="http://www.thespectrumshow.webspace.virginmedia.com/DL/SpeccyMag10.pdf"]available to download[/url].Issue 3B turning offI'm trying to save a Spectrum Issue 3B. I restored the power supply section, changing the 7805, TR4, and TR5, besides all electrolytic capacitors. No…
... trying to save a Spectrum Issue 3B. I restored the power ...Laptop issueMy laptop seems ti have died, i noticed yesterday when i switched it on there was no hard drive activity and the screen was blank, even though the po…
... if anyone knows what the issue could be, is it worth ...Retroleum Nebula - A Spectrum ULA replacement moduleHey you guys.. Just wanted to mention a new Spectrum doobrie created by myself (Phil Ruston) and Alessandro Dorigatti: Namely, the Nebula - A Spec…
... , the Nebula - A Spectrum 48 ULA replacement module. You can read ... .uk/electronics-articles/nebula-spectrum-ula-chip-replacement-module/
ULA book:)
Cheers,
Non working issue 3BGuys Hope you can help me here (or maybe, someonene from Europe could take a look at it? I've already tried different ULA, CPU, ROM and low RAM (…
... /> I've already tried different ULA, CPU, ROM and low RAM ...Currah Microsource ULA & ROMI have a few original (over one hundred) brand new (1986) Microsource ULA's and ROMs in prefect condition. Is anyone interested? My user name may …
I have a few original (over one hundred) brand new (1986) Microsource ULA's and ROMs in prefect condition.
Is anyone interested?
My user name may help authenticate this post.
