Here found 10 pieces for less than 1 GBP including shipment.
https://www.aliexpress.com/item/MPS2369 ... 56880.html
TS1000's (ZX81's) black screen
Re: TS1000's (ZX81's) black screen
SOLVED!
Cheers,
Dessony
I ordered these certain 5 transistors less than a month ago. Then, I took two NTE123A off the TS1000/ZX81 motherboard. The NTE123A's datasheet did not show any time on or time off. How sad! Anyway, I put these new two MPS2369 on the motherboard. I could read the voltage off the CPU's pin #17 and ULA's pin #16! Lastly, I put four ICs back onto the board and then hooked it up to a monitor and a power supply unit. Finally, I saw a black square with a white "K" within its area on a white screen. It worked fine now! The computer's black screen problem is finally Cheers,
Dessony
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Re: TS1000's (ZX81's) black screen
Well done
Good to hear that you have got it working
Mark
Good to hear that you have got it working
Mark
ZX81 Variations
ZX81 Chip Pin-outs
ZX81 Video Transistor Buffer Amp
Standby alert
There are four lights!
Step up to red alert. Sir, are you absolutely sure? It does mean changing the bulb
Looking forward to summer later in the year.
ZX81 Chip Pin-outs
ZX81 Video Transistor Buffer Amp
Standby alert
There are four lights!
Step up to red alert. Sir, are you absolutely sure? It does mean changing the bulb
Looking forward to summer later in the year.