The Sinclair QL Forum

Thinking about my comments after hitting the post button, if the 'scope is grounded at a good "solid" ground point, probably not ground bounce

Mark

Yes, with digital signals, correct timing is everything. A question. Could some of the problems be due to a poor ground layout / tracks? Are you seeing a form of "ground bounce" where the voltage drop through the ground is helping to cause the voltage on the signal lines to be out of spec?...

Best get some 220Ω resistors and 47pF capacitors then to low pass the filtor the signal...
Follow that with a schmitt trigger input and plug and pray

Yes, I know, it's never that simple

Mark

Curiosity has won, If these are both still available, could you add them to my ever growing order please Rich

Mark

Welcome Bob!



Mark

I have a Miracle Systems Double Floppy with a built in PSU. :shock: Looks like the PSU has gone, so my question is: Does anyone have spares of this OR can I get it repaired? Hi Russ The PSU may well be repairable. It depends on the type and what has gone wrong. As Skagon says, we need pictures of t...

So, there I was thinking... Does anyone know of a finished *working* design for a time machine for Dave to err, manufacture? :mrgreen: Seriously, thanks for your support Dave :D And in-between the err, debate that is being refered to, the relevent bit about SD cards is here: If the QL community want...

Rich, how much would the postage be for one Jurgen Falkenberg Keyboard Interface one AT/XT keyboard? Mark Drat does that mean looking for a reasonable sized box to house the damn thing now... :) Within the UK - the postage would be £12 as it would go by courier - cheaper than Royal Mail Large Parce...

vanpeebles wrote:They don't make keyboards like they used to

They don't make buttons like they used to! At work, the "users" used to bash some of the control buttons with the handset of old style GPO telephones

Mark

Rich, how much would the postage be for one Jurgen Falkenberg Keyboard Interface one AT/XT keyboard?

Mark