-
Speed (nano seconds) of memory chips ZX SpectrumThe ZX Spectrum uses 4116 memory for the lower memory, which can be replaced by other sorts or a whole, modern, module, but when searching for 4116 m…
... random crashes.
The service manual says the 4116 DRAM chips ... -
Brightness level of non-bright attributes on classic ZX 48Does anybody know what was a brightness level of non-bright attributes on classic ZX 48? Was it the same on 128, +2 and +3? I can see on wikipedia a…
... ] say something useful in the service manual. Have you had a read ... -
Brightness level of non-bright attributes on classic ZX 48Does anybody know what was a brightness level of non-bright attributes on classic ZX 48? Was it the same on 128, +2 and +3? I can see on wikipedia a…
... , I don't have a service manual, and links on WoS lead ... -
Brightness level of non-bright attributes on classic ZX 48Does anybody know what was a brightness level of non-bright attributes on classic ZX 48? Was it the same on 128, +2 and +3? I can see on wikipedia a…
... 've taken a look at service manual and I'm not good ... -
Composite video ghost image on ZX Spectrum 128K +2Hi, I have a ghost image on the composite video out on my ZX Spectrum 128K +2 and have run out of ideas of what could be wrong. Does anybody have a…
... /48k machines (Ref: ZX Spectrum service manual) and is typical in the ... -
Board schematic files.Where do I go to download Board Layout and Schematics these days?- All up to Issue 6a boards. It's time for some tinkering!
I may have some manuals !
Service manual up to 6A -
Spectrum +2 (grey): Mod- and operation- related advices needed.Dear Sirs and Ladies, Please welcome a newbie to the “World of Spectrum” (both to the forum and, well, metaphorically). I’ve recently purchased a…
There's a schematic for the datacorder pcb in the service manual. I think there's more than one version of the PCB though. I don't know if the circuit is the same. -
Spectrum +2 (grey): Mod- and operation- related advices needed.Dear Sirs and Ladies, Please welcome a newbie to the “World of Spectrum” (both to the forum and, well, metaphorically). I’ve recently purchased a…
... the datacorder pcb in the service manual. I think there's more ... -
Spectrum +2 (grey): Mod- and operation- related advices needed.Dear Sirs and Ladies, Please welcome a newbie to the “World of Spectrum” (both to the forum and, well, metaphorically). I’ve recently purchased a…
... for the Spectrum main board (service manual page 5 of the real ... -
Issue 2 48k Yellow DisplayHi guys. As the title says, I have an issue 2 that's displaying the typical yellow/green colour screen at switch on. The picture is clear and stab…
The service manual states for Issue 1 machines: " ... -
Issue 2 48k Yellow DisplayHi guys. As the title says, I have an issue 2 that's displaying the typical yellow/green colour screen at switch on. The picture is clear and stab…
[quote="balford;880681"]The service manual states for Issue 1 machines: " ... -
Issue 2 48k Yellow DisplayHi guys. As the title says, I have an issue 2 that's displaying the typical yellow/green colour screen at switch on. The picture is clear and stab…
... ;880733"][quote="balford;880681"]The service manual states for Issue 1 machines ... -
ZX Spectrum 48k tape loading issueHi guys I have refreshed a ZX spectrum 48k with a new keyboard layer and front case. The machine will power up and seems to work good. Unfortunate…
... a brief look into the service manual and schematic, please check:
ZX Spectrum 48k output yellow and jumpyI have a ZX Spectrum that I modded for composite output a few years a go. Lately they output started to be a bit jumpy during the first half hour. Th…
... balford,
looking into the service manual sometime ago (which is the ...Spectrum 48k Power Supply?Guys - I've got a Spectrum 48k inbound from the UK. I want to scrounge a power supply to use when it arrives. What size jack did it use and what ar…
Actually, the service manual specifies the capacitor under the heatsink for issue 1 and issue 2 boards to be a 105C type... renewing this capacitor being part of the required service work.
[b][i]Mark[/i][/b]Spectrum 48k Power Supply?Guys - I've got a Spectrum 48k inbound from the UK. I want to scrounge a power supply to use when it arrives. What size jack did it use and what ar…
[quote="1024MAK;896607"]Actually, the service manual specifies the capacitor under the ... being part of the required service work.
[b][i ...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…
... looking at both the speccy service manual and the data sheet for ...No CLK on issue 2 ULA pin 32I'm trying to fix an issue 2. The symptoms are as follows:- Black and white bars on screen, colours near impossible to tune in, although these po…
Spectrum 128k 2a or not 2b....Just picked up a +2 black case version and I'm in as little bit of a quagmire, The case is definitely black, has '+2A' stamped on the bottom, but in…
... datacorder PCB according to the service manual:
[img]http://temp.zxnet ...ZX Spectrum Test PCB I recently read about one of these (I think it may have been the Retroleum site but I am not sure) and I thought "What a great idea" . As pictured …
... which link are in the service manual. NEC ROM chips use the ...ZX Spectrum+ 4B - STOP not workingHi I have been trying to revive an old Spectrum+ I bought off eBay and to that end I bought a new membrane for it as the keyboard was duff. Now I …
... #conv"]this section of the service manual[/url] ;-)
[b][i ...128K memory bank selection to avoid contention issuesI'm currently developing a game and I'm trying to get my head around the memory contention issues of the various 128K/+2/+2A/+3 spectrum models in or…
... -docs/ZXSpectrum128K_TechnicalManual.pdf]128K Technical Service Manual[/url] it says that RAM ...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 …
... 32k byte EPROM and two manual switches: one to select between ... version (as recommended in the service manual).
[*]Have test links that ...ZX Spectrum Test PCB I recently read about one of these (I think it may have been the Retroleum site but I am not sure) and I thought "What a great idea" . As pictured …
... 32k byte EPROM and two manual switches: one to select between ... version (as recommended in the service manual).
[*]Have test links that ...Trying to repair a Speccy 48k - No PulsingI've had this machine for ages. I'd I've been putting off fixing it for some time now. So a couple of days ago I pulled it apart and started prob…
... , TR5 and associated components). The service manual details a Sinclair recommended upgrade ...ZX Spectrum Test PCB I recently read about one of these (I think it may have been the Retroleum site but I am not sure) and I thought "What a great idea" . As pictured …
... circuitry as recommended in the service manual.
[b][i]Mark ...Trying to repair a Speccy 48k - No PulsingI've had this machine for ages. I'd I've been putting off fixing it for some time now. So a couple of days ago I pulled it apart and started prob…
... and upgrades are in the service manual. Note that with some of ...50 Hz / 60 Hz switch in Timex Computer 2068I'm not sure if this is common knowledge, I've certainly never read about it online, though it may be documented in Portuguese or Polish. There is a…
... the TC2048 schematic diagram and Service Manual below.
[img]http ...Atari (kempston) joystick adapter to Sinclair pinoutWhile going through one of my boxes filled with hardware bits I found the joystick adapter I used with the +2: [img]https://i.imgur.com/tlBHTco.jp…
... layout in the +2 (grey) service manual, pins are connected as listed ... schematic. Same for the +3 service manual.
[b][i]Mark ...Help with a TIMEX TC2048 and memory problemBought a 2nd hand Timex TC2048 but unfortunately I detected a problem with the machine which is preventing it from working properly. I believe it …
... ]
(Yes, I know Service Manual recommends 4416-15NL but those ...
