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Interfaces & ROMsHi everyone, I'm currently looking into the various modern interfaces for the Spectrum to allow me to run all my games from an SD card. I have a few…
... have a Spectrum with a 16K RAM fault, I could boot ... ROM and then test the RAM from it. I'd ... TEST PROGRAMS
[*]SPECTRUM 128 RAM TESTER
[*]SPECTRUM ROM ... br />
The 128 RAM Tester and ROM Tester won ... and that's really the upper end of my budget. I ... -
Spectrum stuff for sale (ZX81, RAM pack, Tapes... etc)Selling the following: [IMG]http://s26.postimg.org/uk0ntdsq1/IMG_20140902_205737.jpg[/IMG] [IMG]http://s26.postimg.org/ronkmioq1/IMG_20140902_20575…
... all original too)
ZX81 16k RAM pack - Working
Spectrum tapes ... -
16k to 48K upgradeHi everyone I was just wondering if anybody knows if it is possible to upgrade a 16k Speccy to a 48k with the required RAM chips. If this is possibl…
Hi everyone
I was just wondering if anybody knows if it is possible to upgrade a 16k Speccy to a 48k with the required RAM chips. If this is possible where would i get them from.
thanks a lot
Benammi -
SINCLAIR ZX80 + 16K ORIGINAL EXPANSION ROM!!!http://www.ebay.co.uk/itm/-/171965470419? Here you are my ZX80 in perfect working condition. It was upgraded in 1981 with the new rom and keybo…
... />
With his wonderful 16K expansion ram too!
Happy bids ... -
12V ripple with lower ram installedI repaired a speccy this week. Before doing anything I replaced all caps and measured the transistors in the power section. When doing this I found t…
... lower ram chips had failed (it's a 16k issue3b ... model btw). I desoldered 1 ram ic ... and socketed all lower ram. turned the speccy back ... Then removed the lower ram module and reinserted all ... original lower ram ic's. Speccy is ... -
help with my original issue 3b from when i was a teen. possible lower ram fault.hello, well ive tried to fix my old speccy, but haven't made much progress. could you help me out with some diagnosis. the fault occurred about…
... it. I removed all the upper memory but the fault is ... before I order a lower ram set. -
Upper memory not available in issue 2A friend send me his issue 2 Spectrum for diagnosis. It boots okay but for some reason won't load games over 16kB. He sent also a Smart Card with int…
... diagnostics ROM, which failed the upper memory RAM test, suspecting IC25 and ... stays low.
Both upper and lower memories have been ... A15 high to enable the upper memory and under which conditions ... -
Speccy won't bootHi all, I've got an issue 3 48k that won't boot properly. When I turn it on, it either does one of the two following things, it either displays a …
... 16k, just in case there was something about the upper part of RAM ... -
Issue 2 problem.Hi all, I'm trying to repair / upgrade an Issue 2 Spectrum for a friend, but have come accros the following problem. When I power the machine …
... is that with only 16K fitted the sinclair ram test works and ... machine has 16K ram which is completely working. Fit the upper 32K and ... the RAM test will fail with ... lower address range or sometimes upper address range. This tends to ... -
ZX81 Ram pack problemI got recently Sinclair 16k memory expansion for my ZX81, but for some reason it will not work. The computer itself is operating normally without hi…
I got recently Sinclair 16k memory expansion for my ZX81, ... years.
Of course, maybe ram pack is faulty, but it ... -
A videoaventure in 16K - Cartridge for IF2Hello all, After an intermitent work I am near of reléase my new game: a videoaventure (exploration game) in 16K ROM carttridge. Your objetive is…
... a videoaventure (exploration game) in 16K ROM carttridge.
Your objetive ... reléase source code, and 16K ROM file, after finish ... game 48K like in a 16K native cartridge.
... with Interface II (ZX Spectrum 16K RAM model too).
... -
Another 48k Speccy acting as a 16K model.Hi all, I originally was going to post asking for help to fix the new addition to my family a very nice condition Issue 2 sold on ebay as a 16K model…
... sold on ebay as a 16K model with a faulty ... it was an upgrade (OKI ram chips Btw)
She ... the memory test....oh dear 16k.
So basically I' ... , works fine as a 16k so I thought sod it ... must go to ground..... (OKI ram low enabled)......ahhhhh maybe this ... -
Replacing lower RAM 4116 ZX Spectrum 48k - desoldering advice please?A long post, but interesting pictures perhaps. :) I'd like some advice: (also apologies I think I picked the wrong 'Hardware' category for this, plea…
... seemed to indicate a lower RAM issue. It hadn't been ... ZX board itself, around the upper edge near the modulator. I ... caught the trace on the upper side of the board that ... of solder present on the upper side of the board - as ... -
Third-party ZX81 RAM packsOne of the things that's previously held me back from fishing for a ZX81 on eBay - other than "will the ULA on this machine sold as 'untested' be com…
... was getting hold of a 16K RAM pack. Now, even back in ... of the existence of other RAM packs that weren't the ... I know of the Memotech 16K pack (and 32K and 64K ... (at least try to) eliminate RAM pack wobble, but then there ... time it had a working RAM pack I was [i] ... -
16k and PEEK 40000 (on a real 16k Spectrum)?Imagine a real 16k Spectrum (without any RAM expansion or circuits fitted). What would I get if I do a PEEK or try to access memory over 32767? Wo…
Imagine a real 16k Spectrum (without any RAM expansion or circuits fitted). What ... -
Repairs and Reparing.Hi All, Just finished resurrecting an Issue 3A board. Had black lines, so replaced the lower 16K RAM chips, Amazed they just cost a couple of doll…
... lines, so replaced the lower 16K RAM chips, Amazed they just cost ... it mostly the RAM, or just passive component failure that takes out ... -
PAW questionThis may not be the right place but anyways there it goes: I've been trying to figure out how to import graphic files in .SCR format in the PAW parse…
... +256 ; point to start of 16k RAM
LD B,A ; we ... /3 screens contained in the upper block of memory and then ... a compressor to create the 16k chunks to be loaded as ... you'll need in the 16k pages for graphic data. -
Programing ROM CART from PCHave anybody tried to make a piece of hardware that would be able to program (burn) SINCLAIR cartridge from PC? In the sense, you take TAP or TZX and…
... cart into the spectrum's ram before starting the snap. Even ... the spectrum only pages in 16K, the copy program located at ... that into the upper 48K of the spectrum's ram. This just ... -
helpHi, I am new to this forum. I have purchased a Speccy from ebay but I am having trouble getting any games to load. I dont really have much technical…
... tad over 2 secs, a 16k is proportionally less - 1/3 ... has a fault in the upper 32k RAM, it will (95% of ... ) boot up purely as a 16k machine, so will reset to ... -
Can somebody help me with this?One of my "friends" shoved a piece of metal into the back of my spectrum (48k RAM) and now whenever I try to use it theres nothing but weird lines an…
... the most common cause of failure of the circuit - however, those ... memory faults - I find the upper 8 ICs (TMS4532 or OKI3732 ... an upper memory fault will not stop it booting in 16k mode ... -
Spectrum problemHi I've just been trying to resurrect my 48k spectrum. I'm having some problems loading some of my games, but if it does completely load, it crashe…
... really try and see if 16k games work. If they do ... lower 16k of RAM. Which would leave us with the usual upper memory ... /> On the other hand, if 16k programs don't load, or ... -
New Compo IdeaI've had this idea and would like to know what do you think about it. I think that most of us here know how to code in BASIC. The problem with Specc…
This is what I've compiled so far:
[quote]Resources
=========
* Make all caps
---------------
You can turn CAPS LOCK on or off using a simple poke to 23658:
POKE 23658,8: REM CAPS ON
... -
Want a Speccy Repaired?Maybe it's time to put my 'skills' to use.... Now that I've sourced some of the nastier transistors, I've fixed about 6 rubber keyed Speccys in the …
... , dead Z80 or dead lower 16K RAM.
If you mean just ... 's basically working, though the upper 32K may still be duff. -
"Sinclair Zx Spectrum: Absolutely Better Than Commodore 64"Did you ever read this? [url="http://www.alfonsomartone.itb.it/fztsmo.html"]http://www.alfonsomartone.itb.it/fztsmo.html[/url]
... ) The video-RAM in the 128D was increased to 16K to 64K ... .
The failure of the ... -
What happens during a reset?I always used to wonder about this, but only thought a bit more about it last night when noticing after all these years what actually happens. Obvio…
... chips ARE 16BITS ,but the 'upper' part is not good.
upper 32k of RAM in a 48k speccy ... you want to use the upper or lower 32k of the ... them in software. The lower 16k remains the same no matter ... -
Why so many disk systems?Why did the Speccy have so many floppy disk systems like wafadrive, tr-dos, +3disk, and many more? As far as I can see, this did nothing but create …
... model. It was available in 16K and 48K varieties but there ... board was fully populated with RAM or not.[/QUOTE]
16K fitted to the motherboard. The extra 32K upper block ... -
Multiface 128 problemHello everyone i have a 48k plus speccy which i firstly thought was working perfectly. It passed all the test of the official Sinclair test tape (cpu…
... the 48K RAM switching, and are not present in a 16K machine ... . It's not a matter of failure as ... -
Zx Spectrum Laptop (again)I've been reading all the old treads about a possible portable speccy. I even found the one about the Speccy Laptop. But it seems there's a lot of ne…
... be stored in 16K pages), single 512K static RAM (I think this ... the voltage regulator in the upper left doesn't even have ...
