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The Spectrum Resuscitation ThreadKicking off this thread as a place where people who are fixing/restoring Spectrums (or indeed any other piece of related hardware) can show off their…
ZX Resets when loading programs?Hello, I have a weird issue with my new ZX Spectrum issue 2 16K. The ZX is in great condition, BASIC works and the RAM Diagnostic PEEK 23733 reports …
Pretty sure this is a lower memory problem, any way you can change the 4116 chips, or change the positions? Zxzigg has a memory test program try running that first.A tally on the number of successful builds of the Harlequin[SIZE=4][COLOR=Green][U][B]A tally on the number of successful builds of the Harlequin.[/B][/U][/COLOR][/SIZE] Please post your successes below :-) …
I had problems with lower memory corruption when using Lyontek SRAM. I swapped them with some old Mosel MS62256L 100ns memory chips and the problem went away.Games not compatible with the 128+ & grey +2Like the +2A & +3 thread, there are a few games that do not work correctly on the original 128+ and the grey +2. Two games that I know of that wil…
... instructions
ld ($9c79),hl ; lower memory addresses
ld ($6f19),hl ...
ld ($9c7b),hl ; again, lower memory addresses
ld ($6f1b),hl ...Faulty 48+ Help NeededHi, This is what I get when I plug in the spectrum, this is tuned in. Vid shows a reset. Any ideas, or pointers on the first thing to check. Keyboa…
... , but this time with the replacement lower ram module removed.
[url ...Faulty 48+ Help NeededHi, This is what I get when I plug in the spectrum, this is tuned in. Vid shows a reset. Any ideas, or pointers on the first thing to check. Keyboa…
... .
I'll save the replacement Lower ram module for another fix ...NTSC Compatibility?Correct me if I'm wrong, but wasn't the Timex 2068 the only NTSC clone built of the ZX Spectrum? And I use clone lightly... From what I underst…
... the data bus for [the lower RAM and ULA] and the ... is reading data from the lower RAM, a I/O read ... to be reading from the lower memory for use in displaying the ...Zx Spectrum peritel helpPublished also on Spanish forum link: [url]http://foro.speccy.org/viewtopic.php?f=8&t=4179&p=46000#p46000[/url] where a similar case was examined. G…
... some of the resistors to lower signal peak to peak voltage ... spectrum with both upper an lower memory modules from Zorn, so I ...I'm writing an Operating SystemOkay this might seem like a bait thread, but I am legitamately interested in figuring out how to write a multi-process system for the ZX Spectrum (no…
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Basic allows to limit memory usage by using clear, so ... probably need to swap entire lower memory contents to make it work ...ZX Spectrum 48k issuesHi all! A couple of days ago I bought my first 48k Speccy off ebay (I already own a beautiful QL expanded with QubIDE interface and 640k ram). It was…
... chip will cause a whole memory block to fail (in the ... , this will be the 16k "lower" memory including the screen and system ... will also be in the lower memory area. Corruption of the stack ...ZX Spectrum spare parts : "endangered" and functional "extinctions" only It struck me how some Spectrum spare parts or parts that were used with Spectrums and that were commonly available are no longer available . The em…
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1) Drop in Replacement for PCF 1308/ZX8401? Amstrad ...
2) Drop in Replacement Lower RAM Chips (4116-150's ... br />
3) Drop in replacement for the ULA the Nebula ... 16/48 ULA Replacement
B) SECOND HAND ...ZX Spectrum 48K it only shows colored barsHello, I'm new to the forum and I need help with a ZX Spectrum 48K which I bought recently unfortunately defective. I want to mention that before t…
... with you looking at possible replacement equivalents, if you get one ... has 1 or more faulty lower 16k ram IC's. They ... up. You can buy a replacement lower ram module these days. One ...Lower & upper ram IC's for an issue 3 please.Would any of you great folks have 1 spare lower ram, and 1 spare upper ram IC's you would be willing to sell. I'm fixing up a poorly Spectrum that is…
... now. I've brought a replacement lower ram IC from Mutant Caterpillar ... 4164-150NS for drop-in replacement upper ram IC.
New video about S-video modification on Issue two 48K Spectrum.I just finished an s-video modification on an Issue two 48K Spectrum so I made a video about it. Most of the technical details are in the video; if y…
... much.
Changing upper and lower memory ICs for SRAM modules helps ...New video about S-video modification on Issue two 48K Spectrum.I just finished an s-video modification on an Issue two 48K Spectrum so I made a video about it. Most of the technical details are in the video; if y…
... much.
Changing upper and lower memory ICs for SRAM modules helps ...New Utility to Transfer Z80 Snapshot to +3 DiskSince getting a Gotek for my +3 it has been my go to machine. The biggest downside however is the lack of older games on disk format with pretty much…
... run code to anywhere in lower memory, the ability to name the ... moving the small run code memory location. Default is 23734 so ...MB03 UltimateDear ZX friends, you may have heard of MB-02+, probably the best disk interface for ZX Spectrum, originated back in the 90's. Although not much sp…
... , RTC, 512kB RAM paged in lower memory, tape emulation…). Ok, with MB03 ... tool and test your Spectrum, memory ULA timing, etc.
How Many Games Exist in Both 16K versions and 48K Versions ? I have found one ( Dallas (CCS) 1982 but there could be some more
... levels as needed on the lower memory machine, it seems to have ... it may well use upper memory so fall over.
If you had four roms...Just wondering if you were designing a Spectrum from scratch, and you used a 27512 EPROM, which would hold about 4 spectrum roms, what you would inst…
... way you can have any memory architecture you want and don ... contention timing to the lower 16k of memory, since the system uses ... can find an existing extended memory paging system, I'll probably ... always be mapped to the lower memory, but I intend to find ...Raspberry PI - TXZDuino / ZX-HD – HDMISo I was wondering... 1 The ZXBaremulator is able to take the sound of the emulation and the video and mix them through the HDMI, however the ZX-H…
... HD would be sniffing the lower memory that contains the video information ...Memory and Replacement ULA modules.Thought you might like to see my future proofed 48k version 6A with some upgrades fitted. Has had the following... Recap. Traco Power TSR 1-2450 p…
... -2450 power regulator.
Lower and upper memory modules from... http://zx ... /
Nebula Spectrum ULA Chip replacement module from... http://www.retroleum ... -articles/nebula-spectrum-ula-chip-replacement-module/
Runs perfect, a ...16K/48K Lower RAM (4116) replacement.You may want to read [URL="http://www.worldofspectrum.org/forums/showthread.php?t=37957"]this thread[/URL] for background information on the quest t…
... found an SRAM based replacement for the lower RAM that works in ... levels that appear on the lower RAM address lines. In particular ... this is the ZX Spectrum Lower RAM Replacement Module, pictured below:
zx.zigg.net lower RAM replacement module: Still shipping?Hi everyone I'm trying to resuscitate my 48k issue 6a, and I bought the lower RAM replacement module from zx.zigg.net. The paypal payment went thr…
... , and I bought the lower RAM replacement module from zx.zigg.net ...SRAM replacement for lower 16KSome time ago I wondered if it were possible to replace the lower 16K RAM of a 16K/48K Spectrum with a single SRAM chip. You know, those pesky 4116 D…
... were possible to replace the lower 16K RAM of a 16K ...Faked MP3/memory sticks etcI recently bought an MP3 player on Ebay from jolly old China. I suspected it would be fake as it was advertised as a 16gb MP3/MP4 player and cost me …
... I downloaded that tests flash memory and that came back saying ... me a refund or a replacement...as $21 isn't a ... I decided to get the replacement (more out of morbid curiosity ... here when I receive the replacement and test it out.
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…
... a bit of a tangled memory map at a chip ... ROM sits in the lower 16KB of address space and ... commonly taken to mean a lower RAM fault, ie something ... another speccy, either as a replacement or a donor. Thankfully ... ), a working ROM, working lower RAM and a good CPU ...Why are the same size memory cards different sizes?I've heard before that two memory cards or USB sticks can have the same official capacity, but be different capacities in reality, and I'm not talkin…
... 've heard before that two memory cards or USB sticks can ... the case here) that different memory cards (and USB sticks, though ... individual item possibly higher or lower by a smaller amount than ... MB, GB, etc) is lower than memory of the supposedly equivalent size ...Faulty rubber speccy - advice neededHello all speccy hardware gurus :) Recently I moved to a new flat and after a long time have some space (and time) to dig out my old Speccy hardware…
... and utilities confirming that all memory worked fine. I was ... power supply whose connector needed replacement.
But amidst ... right somewhere between upper and lower ram chips... maybe even ULA ... were that some of the lower ram chips have faultered. ...
