ZXPand Issue 3 - external LED

[balford]

Hi all <cough>sirmorris </cough>

I'm mounting an Issue 3 ZXPand in a Memopak 16K case, and want to add a single external bi-colour LED for status etc.

Two questions - looks as though the Issue 1 ZXPand had headers for this purpose, but the Issue 3 does not. I'm assuming I need to remove the existing LED's in this case.

Also - are the LED's common cathode or anode?

Cheers,
B

[sirmorris]

Howdy!

They are common cathode. You should remove the existing LEDs. Unfortunately I did indeed remove the jumpers for external LEDs on issue three boards.

C

[balford]

Excellent, cheers for that. Will give this a bash over the next day or two

B

[balford]

Got round to this tonight, quite pleased with the results

https://www.youtube.com/watch?v=WzpXGGUdXtQ

Here's the completed case in better light:



B

[sirmorris]

Very nice indeed! Do you take commissions?

[1024MAK]

Impressive

Every now and then I look for a faulty 16k byte Memopack. So far I have three "unable to test" that turned out to be fully working ones, which are still working, as I refuse to trash working kit...

Maybe Memotech got better quality 4116 DRAM chips? Or maybe their design of inverter circuit to provide the -5V supply is the most reliable? Answers on a postcard to "47 Way Back Ave, Lost in time, History County."

Mark

[Fwapp]

Looks superb, Brendan

Sir Morris, are you planning to produce anymore ZXpands in the future? I know of a few who are after one, myself included.

[sirmorris]

On my mind, yes. Can't say when right now.