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Known Z80 M1 problems?I got an email yesterday from someone asking for a Z80 without the M1 problem. I only know about the fanout problem that many Z80's are suffering of…
... , it is machines built around Issue 4S which are most likely to ... -
VTX 5000 Anything I can dial into?Is there anything currently available that I can dial into with a VTX 5000 modem? Any BBS, etc. With or without one of the tapes available to make …
... get a sausage from the 48k issue 3, but hit a fuzzy ... picture from the 16k issue 2 - which was OK except ... -
Known Z80 M1 problems?I got an email yesterday from someone asking for a Z80 without the M1 problem. I only know about the fanout problem that many Z80's are suffering of…
... , it is machines built around Issue 4S which are most likely to ... -
Using an ATX power supply - Spectrum 48kOK... I have an Issue 3 48K model and the DC-DC converter does not work and I can?t make it work. :( There is a MOD to use an ATX power supply on the…
... it currently on a 4S). On the Issue 2 it was a ... +5V in the issue 2 (still working on my Issue 4S machine, waiting ... -
Using an ATX power supply - Spectrum 48kOK... I have an Issue 3 48K model and the DC-DC converter does not work and I can?t make it work. :( There is a MOD to use an ATX power supply on the…
... it currently on a 4S). On the Issue 2 it was a ... (still working on my Issue 4S machine, waiting for parts).[/QUOTE]< ... -
ZX80, ZX81, boxed and unboxed 48K'sI have a lot for sale again. [B]ZX80[/B] To start with a ZX80: in good shape, no missing parts, yellowed though. This one includes a ZX81 rom. Also …
Photo's of the boxed 48K issue 2:
[IMG]http:// ... -
48k+ CPU SocketThink I've bitten off more than I can chew... After the desoldering my z80 went without incident, no damaged pads, tracks etc. I expected the socket…
... memory socket that solved my 48K issue 2 not running when I ... -
Interesting Keyboard FaultWhy-oh-why do I keep buying half-dead Speccys off fleabay. Bought this one as a source of spares, it was listed as having a non-working keyboard due…
I have a similar problem.
My 48K issue 2 does not receive keyboard data.
Keyboard and connectors are OK.
On my PCB there is no TR6, or is this the transistor on top of the CPU between pins 11&30? -
Issue 2 Failed 48k to 128k upgradeI have been trying to upgrade my Issue 2 with the help of Velesoft, using this schematic; [IMG]http://i764.photobucket.com/albums/xx284/arioch1973/4…
... . I compare it to an Issue 4S machine that is working. And ... cant not find why the Issue 2's A14 and A15 ... -
Issue 2 Failed 48k to 128k upgradeI have been trying to upgrade my Issue 2 with the help of Velesoft, using this schematic; [IMG]http://i764.photobucket.com/albums/xx284/arioch1973/4…
... have spent yesterday converting my Issue 4S machine to sockets, so I ... sets of memory on the Issue 4S, running DivIDE test bios to ... , but changing CPU on the Issue 2 does not change the ... -
16k Issue 2 board and DivIDE load errorsI today got an Issue 2 16k board (thank you PMSR) that i added the logic and ram on to get a 48k machine. However, I am unable to load software from …
Well, I dont remember what Issue my first ZX was, I ... (one from you), one issue 4S, and one Issue 3 128k +2 board ... -
Buffered I/O how-to?Hello. How do I implement a buffered I/O? Not all Speccy's I've got will work with more than one device connected to the rear.
... most common in speccies with issue 4S boards. -
ZX 48 issue 4S no s-video possible?No s-video on ZX 48 issue 4S possible? I have had this mod on my issue 4A. But this did not work with my 4S. On C65 is no chrominance signal. Here …
Has anyone the schematic for a issue 4S motherbord?
Micky -
128k +2 (grey) Ear mod - New ULA and still problemsBverstee kindly sold me a 128K ula since the one in my +2 seemed to have a broken ear in. But even with the new ULA, I still can not load games throu…
... enough sound card. My issue 2 and issue 4S have no problems loading ... -
ZX 48 issue 4S no s-video possible?No s-video on ZX 48 issue 4S possible? I have had this mod on my issue 4A. But this did not work with my 4S. On C65 is no chrominance signal. Here …
... out for transistors on the Issue 4S boards made by Samsung. They ... Samsung transistors with the standard issue 3 transistors and it works ... -
ZX 48 issue 4S no s-video possible?No s-video on ZX 48 issue 4S possible? I have had this mod on my issue 4A. But this did not work with my 4S. On C65 is no chrominance signal. Here …
... out for transistors on the Issue 4S boards made by Samsung. They ... Samsung transistors with the standard issue 3 transistors and it works ... at the transistors, and my 4S is indeed having a much ... -
WIP: ULAPlus hardware implementationThis aims to be an "almost" plug-in replacement for the Sinclair ULA chip fitted in Spectrum 16K/48K/Plus machines. It comes in a form of a small PC…
... is plugged on a Spectrum 48K issue 2, using the RGB output ... -
The great 128k ConversionWell, I am not sure if it is going to be great. Hopefully it will! This evening, I set about getting my Issue 6A Spectrum Plus working. I suspecte…
The ROM socket on my 48k issue 1 is upside down as well.
[B][I]Mark[/I][/B] -
Spectrum 16K Issue 3Hi! I just received a Spectrum 16K, which turns out to be an Issue 3. Is it really that rare? If not, I?d like to upgrade it to 48K. There are 12 em…
... turns out to be an Issue 3. Is it really ... what to do for an issue 3.
This ... chips from a (bad) 48K Issue Two be taken? I found ... The TMS4532's from an issue 2 will be fine, see ...
Take care disassembling the issue 3 machine. The keyboard ribbon ... -
Spectrum Serial Numbers Wanted!![b]This post updated Sept. 26, 2013[/b] As far as I know, the serial numbering system for the Spectrum has never been fully worked out. For the p…
... />
D01-209694 - 48k (green)
116-258311 - 48k+ (blue)
U025934 ... are:
001-476109 - 48k
001-065831 - 48k issue 2 -
What kind of Spectrum year was 2012 for you?2012 was for me a low Spectrum year, I coded just 1 game and that was only during the Spectrumdays in Cambridge. So on Spectrumfront it was low, but…
... courage to try my 32K issue 1 ram board in my ... 16K issue 1 spectrum. To my great ... the proud owner of a 48K issue 1 spectrum (and 8 other ... 48K spectrums and 2 toastracks and ... -
A new site for an old projectThe 'Interface 1bis' project site has been moved to: [url]https://sites.google.com/site/interface1bis/[/url] In fact, it's not only a simple relocati…
... for the Sinclair ZX Spectrum 48k, including the 16k and Spectrum ... and is tested with both issue 3 and 4 boards, fitted ... use with Sinclair ZX Spectrum 48k, issue 3 and 4 machines only ... -
SPECTRA New from Paul FarrowLooks good! Read about it [URL="http://www.fruitcake.plus.com/Sinclair/Spectrum/Spectra/SpectraInterface.htm"]here[/URL]
... been testing interoperability between Spectranet (Issue 2), SPECTRA and divIDE. ... br /> [*][b]S2[/b] Issue 4S. IF/1 is flaky. SPECTRA ... reliably.
[*][b]S6[/b] Issue 6A.
[/list]
...
Spectranet (Issue 2)
[list]
[*][b ... -
Replacement 48K MembranesCan anyone recommend a website where I can buy a replacement membrane for my 48K? The only one I know of is Sintech but they charge extortionate amou…
... Spectrums except they're usually Issue 4S and they use different transistors ... my spectrum's is an Issue 4S. -
Spectrum 128K +2 problemhello, i am try to repair my spectrum 128k +2 grey, i remove all ram chips and i have some new ones spares, now i have remove all ram chips, i want …
... /> i have a working spectrum 48k issue 2, can i check somehow ... -1 (that i removed from 48k)
[url]http://aijaa ... -
ZX8401 / PCF1306P / Amstrad 40058 for 48K and 128KZX8401 = PCF1306P = Amstrad 40058, let's get started with that. These chips are used as surrogates. Most of us might think those chips were only use…
On a toastrack (issue 6U) 128k I have,
... X
On a 48k issue 6A I have,
PCF1306P ... -
ZX8401 / PCF1306P / Amstrad 40058 for 48K and 128KZX8401 = PCF1306P = Amstrad 40058, let's get started with that. These chips are used as surrogates. Most of us might think those chips were only use…
... =smogit;687542]On a toastrack (issue 6U) 128k I have,
On a 48k issue 6A I have,
PCF1306P ... -
ZX8401 / PCF1306P / Amstrad 40058 for 48K and 128KZX8401 = PCF1306P = Amstrad 40058, let's get started with that. These chips are used as surrogates. Most of us might think those chips were only use…
... Amstrad 10058 are used in 48K (issue 6 only), toastrack and ... differences or whatsoever between the 48K and 128K models!
... technical-docs/ZXSpectrumIssue6a-Schematics.gif"]48K issue 6[/URL] and 128K ... , and one last edit: issue 6 must have been manufactured ... -
Spectrum 128k +2 grey RAMhi all, the manual say that ram ic's should be KM4164B-15P but when i open my spectrum (not repaired by anyone) the ram chips was KM4164B-12 is thi…
... test KM4164B-12 with the 48k zx?[/QUOTE]
Yes ... in the 16K -> 48K extension (IC15-IC22), only ... have to remove all the 48k ram chips?[/QUOTE]
48K extension doesn't work, ...
[*]schematic of the 48K issue 2
[*]datasheet for ...
