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Op-amp question for the more knowledgeable tech headI have a dual op-amp IC in a 9 pin SIL package. Pin 1 and 9 are Vcc as marked on the datasheet. The internal schematic as supplied on the datasheet…
... datasheet.
The internal schematic as supplied on the datasheet ... -
Hardware description - MULTIFACE 128I make schematic of MULTIFACE 128 (v36) from PCB layers downloaded from WOS. But all PCB layers on WOS contain some bugs, absent signals, etc.. Now …
I make schematic of MULTIFACE 128 (v36) from ... all bugs and here is schematic. I can't verify it ... have real MULTIFACE 128. But schematic structure correspond with known functionality ... [/URL]
I have schematic and board with all components ... -
Opus Discovery OddnessHi everybody, I'm busy trying to repair an Opus Discovery for a customer. It's proving to be quite frustrating. First off, the LM317T regulator fo…
... Discovery 1? I found a schematic for the control circuitry, but ... -
Joystick doubler for SAM COUPEI make new PCB of JOYSTICK DOUBLER for SAM COUPE. [B][COLOR="Red"]But schematic is not tested on real HW.[/COLOR][/B] [url=http://www.oldcomp.cz/vie…
... COUPE. [B][COLOR="Red"]But schematic is not tested on real ... -
yx git repositoryHi, working version of yx - the preemptive multitasking operating system for zx spectrum - git repository can be found [URL="https://github.com/tsti…
... ,
- proportional fonts,
- the IF1 rs232 routines,
- the standard ... -
Outputting debug trace to RS232 (assembly)Hi Guys, I'm working on a game at the moment (written in assembly) but I am really needing to write out a debug trace of what is going on with the p…
... toastrack or higher OR if IF1 is enabled.
However ... to generate an SNA, the IF1 won't be initialised. Can ... -
DIY Issue 1 Internal 32K RAM expansionFollowing on from the information in [URL="http://www.worldofspectrum.org/forums/showthread.php?t=40173"]this[/URL] thread, I finally figured this ou…
... addressed. Here's a basic schematic (part numbers are surface mount ... -
Instantish load options for snapshots on HW?Hello All, I am after some advice if I may! I have a Spectrum 48K & IF2 (RAM Turbo), and a Spectrum+ & IF1. I would like to play the Ultimate game…
... Turbo), and a Spectrum+ & IF1.
I would like ... ebay to go with my IF1, it was always a bit ... -
PlusDlite problems with 128K modelsLast year I developed the PlusDlite, and already shipped out a couple of them. Only recently I discovered some problems with 128K models. I remember…
... 's a part of the schematic; the #/ZXROM is the output ... .jpg[/IMG]
Full schematic [URL="http://www.benophetinternet.nl ... -
Refactoring the ULAplus HDL descriptionFor the ZXUnio project, I'm refactoring the Verilog code I wrote two years ago to describe the ULA and the ULAplus devices. When I've taken this code…
... Verilog, I've drawn a schematic of what it turned to ... the ULA/Timex/ULAplus datapath schematic (click to enlarge)
Creating your own BASIC-commands on IF1bisThe old Sinclair IF1 has offered an easy possibility to create your own new BASIC-command: The use of the shadow variable VECTOR. This is described i…
The old Sinclair IF1 has offered an easy possibility ... the same as for the IF1, even worser: they may be ...Issue 4S washed out pictureEvery single one of these ive had has a washed out display, no where near as crisp as the other issues ive had, Samsung did something there that has …
... care to poke around a schematic and see what the difference ...+2 Audio Input?I'm looking for the audio input on the motherboard side. Looking at a horrible blurry schematic that I have, I'm guessing that EAR is Pin 4?
I'm looking for the audio input on the motherboard side.
Looking at a horrible blurry schematic that I have, I'm guessing that EAR is Pin 4?Strange ZX81 PCBHello I took apart my non-working ZX81 to attempt to fix it and I noticed that the resistors and diodes were soldered a bit strange. The wires are c…
... was looking for the ZX81 schematic online when I came across ...Hooky - hook ZX ROM and rewire RST and NMI to RAM - rantThis is a rather long rant. Not for short tempered. :) The objective is to hook into RST "vectors" and NMI on a Spectrum without affecting the normal…
... to rewire RST 0x08 (since IF1 HW does a page switch ... /> one way is to change IF1 code too...is there a ...IF1 Ula Questionim thinking about getting an interface 1 but im aware that there is/was an issue with the ula.My question is if i have the opportunity to buy one but…
im thinking about getting an interface 1 but im aware that there is/was an issue with the ula.My question is if i have the opportunity to buy one but it has the melt mark or a deformity above the ula does this mean i need to stay well clear of it or are ...Great to be back....and with fun to comeHi all, 1982: I bought a new 16k issue 2 in 1982, eventually got microdrives and a dktronics keyboard (version 1). Built a home made eprom programme…
... fun I'm taking the schematic for the Issue 3 and ...What is this disk interface (and how to use it)?Anybody seen this floppy disk drive interface before? It uses an MB8877A and the rest is 74XX-logic, no GALs/PALs. And an EPROM. [IMG]http://i1373.p…
+3e simple ide interfaceHi guys, I want to make a +3e with my +2a. I'm thinking of making the simple 8bit ide interface (internal) and connecting it to a 40 pin ide to sd r…
... ://www.worldofspectrum.org/zxplus3e/images/schematic.gif[/IMG]
As ...What is the Speccy? exUSSR edition.In exUSSR 8 years ago have been solved all these issues, and developed a General opinion. All who do not agree with this opinion, are incompetent peo…
... computers, repeating not only the schematic and the PCB layout. Replica ...Multi Multiface: the projectI posted some updates on Facebook yesterday about the development of the Multi Multiface, but here is the right place to share all technical findings…
... /> Reverse engineering the Multiface 3 schematic from board files:
The Multiface 3 schematic:
[IMG]https://fbcdn ...RF Video noise on Grey +2's with Z70700 motherboardHi folks, As we know, some limited numbers of Z70700 Iss 1 boards exist (reported by Ben [URL="http://www.worldofspectrum.org/forums/showthread.php?…
... , does anyone know of a schematic and layout for this board ...New multisystem floppy interface (spectrum 16Kb/+2A/CPC464)Dear all, I would like to show you my new extern floppy interface. Same interface can be used for both, CPC and Spectrum systems. CHARACTERISTICS …
... 555 timer.
The schematic for the /READY emulation is ...Testers for new z88dk clibA long (long, long, long) time ago a few people offered to help test the new clib in z88dk. Much time has passed since then and I won't hold people,…
... easy to create ROMs (like IF1 cartridges) and target bankswitched memory ...I broke my 48k Speccy!!!!Hey guys, I am looking for some advice, I hope you can point me in the right direction. So, I went about replacing all the capacitors on my issue 4…
... /> Why does the 4b 48k schematic only show micro farad specs ...Disciple extensionHello to all! Today I successfully repaired a MGT Disciple belonging to a friend of mine, and in the process I had a chance to study a little this r…
... remarkable device. Reading through the schematic I was surprised to see ...+2A/+3 +2B and +3 Schematics (again)Just to announce that I've done a fairly big update/re-organisation of my website, and specifically the [URL="http://alistairsserver.no-ip.org/spectr…
... [/URL], put up a new schematic for the +2B ISSUE2 and ... />
Still no ISSUE 4 schematic I'm afraid, and as ... find any errors in the schematic or the text, let me ...RobikHello to all, Is anyone experienced on this russian clone? I have one at hand with corrupted screen (but it boots and replies to keyboard inputs so …
... poor quality scan of the schematic, and thankfully a fairly compete ...Spectranet + Interface 1?Hi all! I'm having fun with that work of art, the Spectranet. But I can't get it to play nice with an Interface 1 even though that is stated to be …
... to a real Spectrum (48k) - IF1 first, then Spectranet - I am ... the Spectranet first, then the IF1 (a weird set up) then ...
