ZX80 - was: SN76477N

[Gordon JC Pearce]

Dave Dunfield wrote:
>>Today I was looking for something (A Cipher 525 tape drive) that I bought
>>NOS years ago and left in its original box.  I thought I'd found it, opened
>>the box and discovered a Sinclair ZX80 with the "A Course in BASIC
>>Programming" book.  The problem is that I don't remember getting this
>>thing--I'm sure I didn't buy it.   Maybe Dave McGlone tossed it in when we
>>were swapping junk years ago. (P.S. I did find the Cipher and discovered
>>that I bought two of them).
>>
>>I don't know if it works, since I don't know the polarity of the 9vdc
>>adapter.  Either way, is this just common trash or is this actually worth
>>something?.  My wife suggested that I throw it out; she figures that if I
>>didn't even know that I had it after all these years, that I certainly
>>don't need it now.

Positive to tip, assuming it's the same as the ZX81, with a 3.5mm mono 
jack.  Don't throw it out - there are very few of these left and even 
fewer working.

Gordon.