Info on this please.
Info on this please.
Been given this.No badges on it.Is it a real one? Power supply is marked Sinclair but not keyboard.Is it worth anything?Thanks for any help.
Last edited by Ispy on Mon Sep 16, 2024 6:49 pm, edited 2 times in total.
- 1024MAK
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Re: Info on this please.
You haven't attached a photo...
Mark
ZX81 Variations
ZX81 Chip Pin-outs
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Step up to red alert. Sir, are you absolutely sure? It does mean changing the bulb
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ZX81 Chip Pin-outs
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There are four lights!
Step up to red alert. Sir, are you absolutely sure? It does mean changing the bulb

Spring approaching...
- 1024MAK
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Re: Info on this please.
I still don't see a photo. Use the attachments tab below the edit box to attach a jpeg/jpg image. Note that there is a maximum size limit.
Or if using a PC and compatible browser, drag the image file from a folder to the edit box.
In both cases, wait for the upload to complete before posting.
Mark
Or if using a PC and compatible browser, drag the image file from a folder to the edit box.
In both cases, wait for the upload to complete before posting.
Mark
ZX81 Variations
ZX81 Chip Pin-outs
ZX81 Video Transistor Amp
Standby alert 
There are four lights!
Step up to red alert. Sir, are you absolutely sure? It does mean changing the bulb
Spring approaching...
ZX81 Chip Pin-outs
ZX81 Video Transistor Amp


There are four lights!
Step up to red alert. Sir, are you absolutely sure? It does mean changing the bulb

Spring approaching...
- 1024MAK
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Re: Info on this please.
That's a strange one
All Sinclair made computers had Sinclair on the top left rear of the case. Plus various details as part of the plastic on the bottom.
Although Sinclair did not actually manufacture the hardware themselves. In the U.K. Timex did the manufacturing.
This ended at some time after Amstrad bought the computers part of Sinclair Research Ltd (but Sinclair Research Ltd continued continued to trade as it was never sold to Amstrad).
After the sale, Amstrad owned all computer and related stock that Sinclair had owned. Plus the trade marks and other UP relating to the Sinclair Spectrum.
I wonder if Timex later found some stock that was never owned by Sinclair or if they had some stock that had been intended for the other markets (that were not controlled by Amstrad), and hence adapted the case mould. They could not use the Sinclair or ZX Spectrum names, hence the blanks.
Have you powered it on? If yes, what does it say on the start up screen?
Mark

All Sinclair made computers had Sinclair on the top left rear of the case. Plus various details as part of the plastic on the bottom.
Although Sinclair did not actually manufacture the hardware themselves. In the U.K. Timex did the manufacturing.
This ended at some time after Amstrad bought the computers part of Sinclair Research Ltd (but Sinclair Research Ltd continued continued to trade as it was never sold to Amstrad).
After the sale, Amstrad owned all computer and related stock that Sinclair had owned. Plus the trade marks and other UP relating to the Sinclair Spectrum.
I wonder if Timex later found some stock that was never owned by Sinclair or if they had some stock that had been intended for the other markets (that were not controlled by Amstrad), and hence adapted the case mould. They could not use the Sinclair or ZX Spectrum names, hence the blanks.
Have you powered it on? If yes, what does it say on the start up screen?
Mark
ZX81 Variations
ZX81 Chip Pin-outs
ZX81 Video Transistor Amp
Standby alert 
There are four lights!
Step up to red alert. Sir, are you absolutely sure? It does mean changing the bulb
Spring approaching...
ZX81 Chip Pin-outs
ZX81 Video Transistor Amp


There are four lights!
Step up to red alert. Sir, are you absolutely sure? It does mean changing the bulb

Spring approaching...
Re: Info on this please.
Will have a look tomorrow when plugged in.The power supply has Sinclair on it.Thanks.
- 1024MAK
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Re: Info on this please.
Here’s some photos of one of mine. This particular one having the last known PCB revision (issue 6A):
MarkZX81 Variations
ZX81 Chip Pin-outs
ZX81 Video Transistor Amp
Standby alert 
There are four lights!
Step up to red alert. Sir, are you absolutely sure? It does mean changing the bulb
Spring approaching...
ZX81 Chip Pin-outs
ZX81 Video Transistor Amp


There are four lights!
Step up to red alert. Sir, are you absolutely sure? It does mean changing the bulb

Spring approaching...
Re: Info on this please.
I sort of tuned in an old TV with a home made coax.Through a fuzzy picture I can read,copyright symbol 1982 Sinclair Research L.t.d.
Not sure what it should look like.Will look for a better cable.
Not sure what it should look like.Will look for a better cable.
- 1024MAK
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Re: Info on this please.
That’s the normal “copyright” screen that confirms that it’s the normal ZX Spectrum ROM.
Mark
Mark
ZX81 Variations
ZX81 Chip Pin-outs
ZX81 Video Transistor Amp
Standby alert 
There are four lights!
Step up to red alert. Sir, are you absolutely sure? It does mean changing the bulb
Spring approaching...
ZX81 Chip Pin-outs
ZX81 Video Transistor Amp


There are four lights!
Step up to red alert. Sir, are you absolutely sure? It does mean changing the bulb

Spring approaching...
Re: Info on this please.
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