-
Dead Spectrum +Hi all, I've recently dug out my old Spectrum + with the idea of repairing it. When I last looked at it, when I was much younger, I was soldering a …
... check you're getting 5v off the 7805 voltage ... other voltages: +12v and -5v. The way I normally ... 4 power supply pins - 0v, 5v, -5v and 12v!)
... ...but in summary:
Pin 1 = Vbb: -5v
Pin 8 = Vdd ...
Pin 9 = Vcc: +5v
Pin 16 = Vss: 0v ... -
toasted soeccysHello, ive jsut bought a pair of speccys on ebay (one 16k issue 2 & a prob 48k issue 3) unfortunaly the genius who sold them tried to see if the wor…
... check you're getting 5v off the 7805 voltage ... other voltages: +12v and -5v. The way I normally ... 4 power supply pins - 0v, 5v, -5v and 12v!)
... ...but in summary:
Pin 1 = Vbb: -5v
Pin 8 = Vdd ...
Pin 9 = Vcc: +5v
Pin 16 = Vss: 0v ... -
WOOOH nice find today :)all my retro game goodness came today :P nearly orgasmed in a charity shop today as i came across all the following .....boxed a gamegear (with powe…
... thus
1: one of the battery compartment lids has the ... ago, but it doesnt have battery compartment lids, tch)
2 ... -
+3 external floppyI'd like to connect 3,5" PC floppy drive (NEC) to ZX Spectrum +3 (with diode for RDY). Here are questions: 1) It seems the PC floppy uses just +5V, …
... />
1) It seems the PC floppy uses just +5V, right?
5V. In any case you loose ... opposite case - connecting 12V without 5V connected may cause damage.
+3 external floppyI'd like to connect 3,5" PC floppy drive (NEC) to ZX Spectrum +3 (with diode for RDY). Here are questions: 1) It seems the PC floppy uses just +5V, …
... got one thats has written 1.5 - 12V AC-DC STABILIZER ... gives option of voltages:
1.5-3-4.5-6 ...
when set to 4.5V the output is 4.7V ...+3 external floppyI'd like to connect 3,5" PC floppy drive (NEC) to ZX Spectrum +3 (with diode for RDY). Here are questions: 1) It seems the PC floppy uses just +5V, …
... got one thats has written 1.5 - 12V AC-DC STABILIZER ... gives option of voltages:
1.5-3-4.5-6 ...
when set to 4.5V the output is 4.7V ...Issue 1 32K Memory Upgrade neededHi folks, as the title suggest im looking for the original sinclair memory board to make it 48k from 16k. Any other form will do or even instructions…
... 48k Service Manual - Section 4.1'
[url]http://www ... ][/B]
Board Issue 1:
The extension memory ... for the -3 IC and +5V for the -4. A link ...Mysteries of Electricity QuizA little fun quiz that I know the answers to, but may lead to some head scratching and disbelief, but there's easy experiments than can be performed …
Follow up No.1 Experiment:
... the positive of the battery and not the negative ... positive AND negative of the battery.
The ... ?
The battery gases are also explosive (hydrogen ... the cover off your battery the spark will jump ...Mysteries of Electricity QuizA little fun quiz that I know the answers to, but may lead to some head scratching and disbelief, but there's easy experiments than can be performed …
... positive AND negative of the battery.
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... mixture is approximately right (15:1 air/fuel for petrol, ... />
[quote]
The battery gases are also explosive (hydrogen ... acid and broken bits of battery around).
[quote ...Mysteries of Electricity QuizA little fun quiz that I know the answers to, but may lead to some head scratching and disbelief, but there's easy experiments than can be performed …
... the -ve terminal of the battery) and the body should be ... the world record for a 1/4 mile drag was 4 ...On a 48K issue 6A......how can i isolate the 32K block? I want to test if there is any fault on the 4116's , leaving the 4532's out of the equation. Will removing the …
... :
pin 1 - Vbb: this should be -5v (note the minus ... 9 - Vcc: this should be +5v
Datasheet for the ... are off (more than 0.5v, and the chip will not ... other machine) is suspect. The +5v is supplied by the 7805 ...On a 48K issue 6A......how can i isolate the 32K block? I want to test if there is any fault on the 4116's , leaving the 4532's out of the equation. Will removing the …
... />
pin 1 - Vbb: this should be -5v (note the minus ... 9 - Vcc: this should be +5v
If those ... are off (more than 0.5v, and the chip will ... ) is suspect.
The +5v is supplied by the 7805 ... voltages:
Pin 1: minus 5.13v
Dead Spectrum +Hi all, I've recently dug out my old Spectrum + with the idea of repairing it. When I last looked at it, when I was much younger, I was soldering a …
... thanks to Winstons pointer, Pin 1 = Vbb: -5v, this checks out zero ...It's fitting...... that in the very month that the 25th anniversary of the Speccy falls on, I'm just finishing up making my first ever Spectrum peripheral. It's a …
... --\\ \ ___
|| |o---+-|___|--o +5V
+5 o--//__/ |
1[/B] and [B]Ay[/B ...Faulty M1 linesI'm sure this has been discussed before, but using the forum search for the word 'M1' pulled back no hits, which surprised the hell out of me. Anywa…
... /> [code]
10 LET a=1
20 FOR i=0 ... to M1 directly to the +5v supply. Now the Spectrum+ and ...Faulty M1 linesI'm sure this has been discussed before, but using the forum search for the word 'M1' pulled back no hits, which surprised the hell out of me. Anywa…
... /> [code]
10 LET a=1
20 FOR i=0 ... to M1 directly to the +5v supply. Now the Spectrum+ and ...games club WC 10/04/07over 2000 years ago, the robot jesus 0.1, was created and went on to lay waste to a third of the earth. after a pitched battle he died and his space …
... tips from memory:
[1] Buy the "Remote Droid" as ... on him, in case his battery has run out.
EPROM Programmer?I'd like to pick an eprom programmer up for trying new roms with my +3 and my BBC Master (I need some extra roms to make it useable with my GoMMC any…
... "]Willem[/URL] EPROM programmer v4.1. I burned a PLCC-32 ... it.
The 4.1 does the work with an ... allow you to burn 12.5V EPROMs, used by Spectrum interfaces ...Testing RAM Chips After RemovalHi I am going to use Winstons Hot Air Gun method of removing the RAM chips from a 4S circuit board. I wish to check the RAM chips, I have a Logic Pr…
... affair, basically:
- 1 x 74HC138 - for I/O ... ROM bank register
- 1 x 74HC32 - quad 2-input ... ROM chip enable
- 1 x of either Am29F010 or ... place)
- 8 x 5v LEDs (i.e. LEDs with ... in and sized for 5v operation)
- 1 x ceramic disc ( ...problem with sinclair zx 48 issue 6aHi all, I have the following problem when I turn on my sinclair without rom inserted. [url]http://217.79.64.145/sinclair/5.jpg[/url] when I turn o…
... for this spectrum..
1'st I change d19 old ... memory chips used 5v I remove track from 5v on the left ...RGB OutputWas there ever a device available for the 48 that had a RGB output ? As an alternative , what about using a pc monitor (iirc these have seperate syn…
... so here goes.
1 - Ground
2 - Composite Sync ... voltage regulator to give the 5V the device needs. In mono ... mode it derives this 5V from the 9V available on ...48K Speccy not workingHey, A few months ago (hope it´s not to late) I was loading a game into my speccy and from one moment to another it stopped working! I unplugge…
... following pins:
Pin 1: Should show -5v
Pin 8: Should ...
Pin 9: Should show +5v
If it were ...48K Speccy not workingHey, A few months ago (hope it´s not to late) I was loading a game into my speccy and from one moment to another it stopped working! I unplugge…
... 3 and 2, then between 1 and 2. Pin 2 ... connected to "ground". Pin 1 is the input of the ... output and it should give +5V.
Alternatively you may measure ... one of the following:
1. 7805 is dead => ... (blue ones) on the +5V line is shortened. It's ...InterfaceHi I'm building a spectrum emulator. I've tried to build it as modular as possible, for example I have a zx class that have input and output devices…
... be at logic 0, logic 1 or switched off (the switched ...The whole "Maddie" thing...Can you say "trial by media"? How about "media over-reaction"? Had "Maddie" been a poor, ugly, black child, this would never have been headline news…
... year, on the order of 1 in 10 million), vs the ... (probably a lot less than 1 in 10 million!)[/QUOTE]
battery in wheelchair gone flat, needs ...TC2068 emulator cart - problemHi, Sorry for posting timex related stuff on a spectrum forum. So, this cart (spectrum emulator) can only adress 16K. I can load small games but i …
... :
1. Pin 27 must go to +5V. On an EPROM ... have pin 27 connected to +5V (ok) and pin 6 of ... function
+-+
A15 ------1--O| \ +-+
| |O--3--------4 ...Unconventional way of diagnosing a faultHi everyone Some time ago I got a 48k Spectrum (issue 3B board) in a pretty bad condition. I believe the power supply transistor TR4 failed, causing…
... :
check the +5v/+12v/-5v supplies to the 4116 memory ... , and check the +5v supply elsewhere. It's not ... lines that are stuck at 1 or 0 (or maybe ... changes by something less than 5v) - but you'll need ... will be damaged if +5v is supplied in the absence ...Unconventional way of diagnosing a faultHi everyone Some time ago I got a 48k Spectrum (issue 3B board) in a pretty bad condition. I believe the power supply transistor TR4 failed, causing…
... :
check the +5v/+12v/-5v supplies to the 4116 memory ... , and check the +5v supply elsewhere. It's not ... lines that are stuck at 1 or 0 (or maybe ... changes by something less than 5v) - but you'll need ... will be damaged if +5v is supplied in the absence ...Spectrum Diagnostics Board - 25th Anniversary projectWell, I said I'd try and get something online about this by today, and I have indeed done so. This web page still needs finishing off (in particular,…
... ROM. Then there's the battery of memory tests, as well ... 160x100mm Eurocard), in quantities of 1 eurocard panel, each PCB would ...Pics from my uncle's 48K SpeccyThis was built back in 1987 and it looks old now, but it brings back lots of good memories. [url]http://zxspectrum.zidev.com/zx/1987enclosure/HPIM16…
... know he used a few 1.2v rechargeable batteries, added an ... system that used a car battery to power not just the ...
