Sinclair ZX80 / ZX81 / Z88 Forums

Thanks for your thoughts Mark. Think I’ll likely keep it as-is then. The caps have already been replaced with good quality Vishay types. And have double-checked the cable’s solder joints and all’s good. So it was either always like this, or perhaps one of the transistors or ICs is on its way out. Fr...

Hey Mark. Just wanted to say many thanks for the help you gave me late last year in making up an RGB lead for the Adapt RGB interface. Finally got around to soldering it up a couple days back and it works absolutely fine! Mucho thanks! :) Picture is very good, though I do get some dark blue 'snow' o...

Brilliant, thanks again (again!) Mark. Will leave the 5V unconnected then, but will keep a spare unconnected wire free just incase (10 wires in this shielded cable so a few spare). Will do as you suggest and connect the screen at the Philips monitor end only then (shield of the RGB input socket conn...

P.S. (There had to be a p.s.) Do I need to connect the 5V pin (pin 6 on the rgb interface side) to the cable? Cursory reading about BBC computer RGB cables suggests most leave that unconnected as seldom used? Lastly, re. the outer braided cable shielding. Shall I simply use that as the OV ground per...

That's great to know - makes it a simpler wiring job then!

Very much appreciate your help Mark, ta. Hopefully will be able to post a photo of it working within the week, touch wood!

John.

Thanks for your explanations of RGB and TTL Mark - very helpful indeed! Copied for future reference. Looks like I can make up a simple 6-pin DIN to 9-pin D-Sub cable then, using the Philips' D-sub input socket switched to TTL RGB mode. By the look of it then, I might need to experiment with connecti...

Thanks for your reply Mark. Where I'm getting confused I think is in the Adapt RGB data sheet in my first post, where it says the the RGB outputs are all at TTL levels. As I understand it, TTL is a digital RGB standard? I know my Philips CM8833 Mk2 can switch between analogue and TTL RGB. So the con...

Hi folks. First post here! :) I have my original Christmas 1985 ZX Spectrum+ working well, all recapped etc. Recently I found my Grandfather's old Adapt Electronics RGB Interface in the loft, and would like to use this with my Speccy. My monitor is a Philips CM8833 Mk2. I need a cable for the interf...