-
Broken Spectrum 48k: Faulty rams?Hi! I recently bought a used Spectrum 48k which works perfectly apart from not recognizing the upper 32k ram (so making it a Spectrum 16k that way).…
... power convertor (creating -5 and +12V) changed while the PCB layout ... -
Spectrum +3 and Commodore 1084S-D1Hi everybody, I know, we already talked about this here, but I still have the problem and cannot find the solution. I just bought a video cable from…
... pull-up resistor to the 12V line of the +3's ... -
48k + Spectrum Issue 4S Display IssueHi all! Brand new user here. Growing up I had a zx spectrum for a little bit, and recently I have bought a working 48k + Spectrum (Issue 4). I was…
... spectrum that was missing the 12v line.
... got working +5v, -5v and +12v rails.
The ... was caused by the 12v rail being at around ... age.
The 12v supply is used by the ... (because the LM1889 uses the 12v supply too).
48k + Spectrum Issue 4S Display IssueHi all! Brand new user here. Growing up I had a zx spectrum for a little bit, and recently I have bought a working 48k + Spectrum (Issue 4). I was…
... supply.
The -5V and +12V supplies are generated by a ... .25V. The voltage on the +12V should be between 11.5V ...Joystick Interfaces on +2AJust found out that my DK'Tronics joystick interface doesn't want to play with my +2A (black). The Kempston port works OK, but not the Sinclair port…
... being that they work at +12V and -12V logic levels.
[/LIST ...Video output questions...Two questions... [QUOTE]1. The yellow and blue colours seem out of phase on the display. Is this normal for an RF connection to the TV/monitor?[/QUO…
... 150 Ohm resistor between the 12V pin 5 and the blanking ... Speccy.
Is the 12V from the socket enough to ... socket to let me draw 12V directly. I guess I then ...Video output questions...Two questions... [QUOTE]1. The yellow and blue colours seem out of phase on the display. Is this normal for an RF connection to the TV/monitor?[/QUO…
... =joefish;696020]
Is the 12V from the socket enough to ... socket to let me draw 12V directly. I guess I then ... around 1.18v on the "12v" pin when connected to the ...48k + Spectrum Issue 4S Display IssueHi all! Brand new user here. Growing up I had a zx spectrum for a little bit, and recently I have bought a working 48k + Spectrum (Issue 4). I was…
... =navy][COLOR=navy]-5V and +12v[/COLOR] [/COLOR][COLOR=navy]originate ...Video output questions...Two questions... [QUOTE]1. The yellow and blue colours seem out of phase on the display. Is this normal for an RF connection to the TV/monitor?[/QUO…
... is supposed to take 12V as a prompt to switch ... impedence. So shouldn't the 12V, even with that 1k ... Now, that page suggests taking 12V from the +2A's AUX ... supply power directly from the 12V PSU input without resistors ... off power from the 12V lines in the PSU ...
