Search found 1858 matches

by 1024MAK
Sun Feb 18, 2018 1:04 am
Forum: Sinclair Misc
Topic: The Future of Sinclair ZX World
Replies: 51
Views: 2938

Re: The Future of Sinclair ZX World

Here's a image showing the top banner prior to the update:-
IMG_6504.JPG
Banner
IMG_6504.JPG (153.69 KiB) Viewed 14 times
Mark
by 1024MAK
Sat Feb 17, 2018 6:46 pm
Forum: Sinclair Misc
Topic: The Future of Sinclair ZX World
Replies: 51
Views: 2938

Re: The Future of Sinclair ZX World

Although I notice that we have the default phpBB logo on the top left of every page now instead of the site logo :(

Mark
by 1024MAK
Sat Feb 17, 2018 6:44 pm
Forum: Sinclair Misc
Topic: The Future of Sinclair ZX World
Replies: 51
Views: 2938

Re: The Future of Sinclair ZX World

Yes, it does seem a bit quicker :D

Mark
by 1024MAK
Sat Feb 17, 2018 12:39 am
Forum: Hardware
Topic: Problem with my new ZXpand+
Replies: 7
Views: 189

Re: Problem with my new ZXpand+

Definitely worthwhile cleaning the edge-connector ;)

Mark
by 1024MAK
Mon Feb 12, 2018 1:12 am
Forum: Hardware
Topic: My first wire wrap: Wilf's AT keyboard interface
Replies: 43
Views: 1284

Re: My first wire wrap: Wilf's AT keyboard interface

The keyboard uses the Z80's I/O instructions. It is documented (but only in some of the Z80 documentation) that when an I/O instruction puts an address on address bus lines A0 to A7, it also puts a value on address lines A8 to A15. What is put on these depends on the instruction. For example: IN A,(...
by 1024MAK
Sun Feb 11, 2018 5:08 pm
Forum: Hardware
Topic: Alcohol and AL
Replies: 2
Views: 79

Re: Alcohol and AL

Nooo! Keep solvents away from membranes :o Only use (mild) soapy water on membrane keyboards ;) Follow with a rinse of clean water. Unless you live in a soft water area, I suggest deminiaturised water is used. Otherwise ensure that the water droplets are wiped off with a lint free cloth. Also with s...
by 1024MAK
Sat Feb 10, 2018 6:45 pm
Forum: Software
Topic: Preserving ZX81 titles
Replies: 2
Views: 124

Re: Preserving ZX81 titles

If you have a ‪ZXpand‬, there is ‪ZXpand tape scrape‬ which will capture most tape programs and store on a SD card.

Mark
by 1024MAK
Sat Feb 10, 2018 2:53 am
Forum: Hardware
Topic: Improving Timex/Sinclair Tape Loading
Replies: 114
Views: 5508

Re: Improving Timex/Sinclair Tape Loading

Lardo Boffin wrote:
Wed Feb 07, 2018 11:31 am
Stuff on its way to Mark and Sir Morris. Enjoy!
@Lardo Boffin
Box of bits has arrived! :D

Thanks 8-)

Mark
by 1024MAK
Sat Feb 10, 2018 12:29 am
Forum: Hardware
Topic: What would you expect a high-z but pulled-up output to do to a data line?
Replies: 8
Views: 215

Re: What would you expect a high-z but pulled-up output to do to a data line?

Some devices have pull-up devices which are not able to be disabled even when the output is programmed to operate in tri-state (hi-z) mode :-(
In certain cases, this can load the line that they are connected to.

Mark
by 1024MAK
Fri Feb 09, 2018 5:44 pm
Forum: Hardware
Topic: What would you expect a high-z but pulled-up output to do to a data line?
Replies: 8
Views: 215

Re: What would you expect a high-z but pulled-up output to do to a data line?

Depends on what devices are driving it via the diodes. I would suggest that a normal minimum of 470 ohms to 1k ohms. 1k being typical for use as pull-ups when used with 74xxx or 74LSxxx TTL gates. Of course, the trade-off with a lower value resistor, is higher power consumption. The reason that a lo...