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
Search found 592 matches
- Mon Oct 21, 2013 9:15 pm
- Forum: Hardware
- Topic: QL-SD card project
- Replies: 43
- Views: 29044
- Mon Oct 21, 2013 9:06 pm
- Forum: Hardware
- Topic: QL-SD card project
- Replies: 43
- Views: 29044
Re: QL-SD card project
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?...
- Mon Oct 21, 2013 8:03 pm
- Forum: Hardware
- Topic: QL-SD card project
- Replies: 43
- Views: 29044
Re: QL-SD card project
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
Follow that with a schmitt trigger input and plug and pray
Yes, I know, it's never that simple
Mark
- Mon Oct 21, 2013 7:14 pm
- Forum: For Sale
- Topic: SOLD 2 x Small QL Interfaces
- Replies: 4
- Views: 2745
Re: 2 x Small QL Interfaces
Curiosity has won, If these are both still available, could you add them to my ever growing order please Rich
Mark
Mark
- Mon Oct 21, 2013 5:33 pm
- Forum: The Welcome Area
- Topic: Hello from Yorkshire
- Replies: 5
- Views: 4345
Re: Hello from Yorkshire
Welcome Bob!
Mark
Mark
- Mon Oct 21, 2013 1:13 am
- Forum: Hardware
- Topic: Miracle Systems Floppy PSU
- Replies: 25
- Views: 13789
Re: Miracle Systems Floppy PSU
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...
- Sun Oct 20, 2013 7:53 pm
- Forum: Hardware
- Topic: QL-SD card project
- Replies: 43
- Views: 29044
Re: QL-SD card project
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...
- Sun Oct 20, 2013 4:38 pm
- Forum: For Sale
- Topic: SOLD Jurgen Falkenberg Keyboard Interfaces
- Replies: 65
- Views: 29059
Re: Jurgen Falkenberg Keyboard Interfaces
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...
- Sun Oct 20, 2013 4:31 pm
- Forum: For Sale
- Topic: SOLD Jurgen Falkenberg Keyboard Interfaces
- Replies: 65
- Views: 29059
Re: Jurgen Falkenberg Keyboard Interfaces
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 telephonesvanpeebles wrote:They don't make keyboards like they used to
Mark
- Sun Oct 20, 2013 4:29 pm
- Forum: For Sale
- Topic: SOLD Jurgen Falkenberg Keyboard Interfaces
- Replies: 65
- Views: 29059
Re: Jurgen Falkenberg Keyboard Interfaces
Rich, how much would the postage be for one Jurgen Falkenberg Keyboard Interface one AT/XT keyboard?
Mark
Mark