Search found 757 matches

by 1024MAK
04 Oct 2014 18:59
Forum: GENERAL DISCUSSIONS
Topic: MTX User Community - The way forward
Replies: 5
Views: 7367

Re: MTX User Community - The way forward

My views are here ... Here are some good examples of retro computer communities where forums are well used:- StarDot (Acorn computers including the BBC Micro) Atari-Forum (Atari ST and related computers) World of Spectrum (Sinclair ZX Spectrum and clones) Sinclair ZX World (ZX80, ZX81, Timex 1000 an...
by 1024MAK
03 Oct 2014 15:06
Forum: GENERAL DISCUSSIONS
Topic: Suggestions
Replies: 19
Views: 19656

Re: Suggestions

In all the forums that run the same software as this one (phpBB), I just just the " View active topics " link available from all forum home/main index pages, and in this forum (and most others) available at the top of all pages. A good link to bookmark :mrgreen: For the less busy forums, I...
by 1024MAK
28 Sep 2014 11:47
Forum: NEW HARDWARE
Topic: V9958 on an MTX
Replies: 23
Views: 27478

Re: V9958 on an MTX

Nice :D

Keep them updates coming :P

Mark
by 1024MAK
24 Sep 2014 15:48
Forum: HARDWARE
Topic: Node Ring Connections
Replies: 6
Views: 6803

Re: Node Ring Connections

Bill, I agree 100%. At every impedance mis-match, reflections of the signal will occur including at the combined termination of the receiver chip and 1k resistor that I suggested. However, if the driver chip includes a 300 ohm resistance in the output, and the output is current limited to 10mA (shor...
by 1024MAK
24 Sep 2014 06:38
Forum: HARDWARE
Topic: Node Ring Connections
Replies: 6
Views: 6803

Re: Node Ring Connections

@ Dave, I think you misunderstood my earlier post. I was just pointing out for the benefit of the people who do not know, that RS232 can go further than a lot of them think. Right, now most RS232 driver chip outputs include a 300 ohm resistance. Also some have outputs that limit the short circuit ou...
by 1024MAK
23 Sep 2014 08:51
Forum: HARDWARE
Topic: FDX 80 Column Fault - Video Question . . .
Replies: 13
Views: 14459

Re: FDX 80 Column Fault - Video Question . . .

:arrow: @ Dave - anymore testing done? :?:

Mark
by 1024MAK
23 Sep 2014 08:49
Forum: HARDWARE
Topic: Node Ring Connections
Replies: 6
Views: 6803

Re: Node Ring Connections

Driver chips, designed for RS232 have to be current limited to meet the specification. The distance a RS232 link can work reliably is inversely proportional to the baud rate (or more correctly, the bps rate). So at lower speeds, using twisted pair screened cable, it is possible to have a link 1/4 mi...
by 1024MAK
22 Sep 2014 00:42
Forum: NEW HARDWARE
Topic: V9958 on an MTX
Replies: 23
Views: 27478

Re: V9958 on an MTX

I think the answer to Dave's question is: down the back of a sofa?

Well done Martin.

Now does this mean we get a colour version of textinvaders?

Mark
by 1024MAK
21 Sep 2014 03:33
Forum: HARDWARE
Topic: Building a replacement MTX PSU
Replies: 166
Views: 186301

Re: Building a replacement MTX PSU

Outputs: Two 7.5V AC feeds (for feeding to the diodes that in turn go to the +5V regulator and the -5V zener diode supply circuitry) One +16V DC feed, for feeding to one of the diodes that in turn supplies the +12V regulator. The +16V DC supply is generated by a LM2577 based step up DC to DC convert...
by 1024MAK
20 Sep 2014 01:51
Forum: HARDWARE
Topic: Building a replacement MTX PSU
Replies: 166
Views: 186301

Re: Building a replacement MTX PSU - Sneak Preview

More photos...

Image

Image

Image

I'll put more up on Sunday :mrgreen:

Mark