Search found 7377 matches

by 1024MAK
Tue Jun 19, 2018 3:23 am
Forum: hardware
Topic: Acorn factory friday special B+
Replies: 15
Views: 331

Re: Acorn factory friday special B+

When Amstrad moved all manufacturing for the Spectrum to the Far East with Orion (who did the CPC, PCW and would be doing the soon to be launched PC's), Sugar threw the Timex factory the bone of assembling his DMP2000 printers. By the way, do you know who Amstrad used to assemble the U.K. made vers...
by 1024MAK
Mon Jun 18, 2018 10:14 pm
Forum: general
Topic: Today I received.....
Replies: 4629
Views: 311728

Re: Today I received.....

I presume the keyboard fits okay when EPROMs are installed all along the bottom row?

If so, nice design :D

And a nice find =D>

Mark
by 1024MAK
Mon Jun 18, 2018 10:06 pm
Forum: stardot.org.uk
Topic: Post Edits
Replies: 24
Views: 518

Re: Post Edits

Just so you are all aware, only moderators and administrators get the box where a reason can be entered when editing a post. So my recommendation is for members to add a line similar to this at the bottom of their post: Edited due to <reason> You can of course expand on this if you wish. However, if...
by 1024MAK
Mon Jun 18, 2018 10:02 pm
Forum: stardot.org.uk
Topic: Post editing
Replies: 59
Views: 641

Re: Post editing

OK - you can choose a theme, or style, in the UCP that only shows you the edit line when someone's entered a reason for their edit: new-board-style.png Just so you are all aware, only moderators and administrators get the box where a reason can be entered when editing a post. So my recommendation i...
by 1024MAK
Mon Jun 18, 2018 5:13 pm
Forum: stardot.org.uk
Topic: Post Edits
Replies: 24
Views: 518

Re: Post Edits

This forum isn't overrun with trolls The moderator and admin team do their best to keep the forums neat and tidy, so that when the occasional bit of trouble breaks out, it is cleaned up quickly. We are of course helped by members reporting any misbehaviour. So thank you to those members who have ta...
by 1024MAK
Mon Jun 18, 2018 4:54 pm
Forum: hardware
Topic: (Yet another) Memory Question
Replies: 7
Views: 126

Re: (Yet another) Memory Question

Don't think so...

Mark
by 1024MAK
Mon Jun 18, 2018 11:44 am
Forum: hardware
Topic: Master PSU repair - not going well
Replies: 14
Views: 374

Re: Master PSU repair - not going well

I posted about using a light bulb in this post. It includes a diagram :D

Mark
by 1024MAK
Mon Jun 18, 2018 11:38 am
Forum: hardware
Topic: (Yet another) Memory Question
Replies: 7
Views: 126

Re: (Yet another) Memory Question

When you say you checked that IC14 (74LS245 data transceiver), do you mean you tested the chip from the faulty machine in a known good machine AND tried a known good 74LS245 in the faulty machine?

Mark
by 1024MAK
Mon Jun 18, 2018 11:34 am
Forum: hardware
Topic: (Yet another) Memory Question
Replies: 7
Views: 126

Re: (Yet another) Memory Question

If you have, or have access to an EPROM programmer, you can program Tricky's test 'ROM', then remove all ROM chips (including the OS ROM) and put the test ROM in the OS ROM socket. This should then show a picture if most of the rest of the 'core' system is functional. Tricky's test ROM does not need...
by 1024MAK
Mon Jun 18, 2018 11:14 am
Forum: for sale / freebies
Topic: Worth Taking a Look At
Replies: 2609
Views: 215204

Re: Worth Taking a Look At

I guess one persons junk is another’s treasure, certain people in my household think any computer with less than 32 bits is junk. :) Computers with less than 32 bits are a bit rare. A ZX80 has 1024 bits and that's just the RAM... :lol: Mark Don't you mean 8192 bits of RAM? Err, yeah :lol: Been thin...
by 1024MAK
Sun Jun 17, 2018 6:04 pm
Forum: stardot.org.uk
Topic: Post editing
Replies: 59
Views: 641

Re: Post editing

Click this link to take you to the poll...

Mark
by 1024MAK
Sun Jun 17, 2018 5:38 pm
Forum: hardware
Topic: load from disc 1
Replies: 26
Views: 473

Re: load from disc 1

Well done =D>

I'm glad you got the 3.5" drive working.

Mark
by 1024MAK
Sun Jun 17, 2018 4:39 pm
Forum: stardot.org.uk
Topic: Post editing
Replies: 59
Views: 641

Re: Post editing

On the 'Last edited by' footers, showing a count of edits will discourage me from fixing minor typos. I share the view that a short 'grace period' during which edits can be made invisibly should be allowed, if the forum software is capable of that. That might be a good compromise solution. But I ge...
by 1024MAK
Sun Jun 17, 2018 1:03 pm
Forum: stardot.org.uk
Topic: Post editing
Replies: 59
Views: 641

Re: Post editing

Elminster wrote:
Sun Jun 17, 2018 12:31 pm
Ditto. I can’t see it either. Didn’t we have this issue the other day? Forget what causes it now.
No, this is a different thing, this time it was due to a mistake made by me.

Mark
by 1024MAK
Sun Jun 17, 2018 1:01 pm
Forum: stardot.org.uk
Topic: Post editing
Replies: 59
Views: 641

Re: Post editing

Sorry about the image not being visible to most users. I've learnt something new about what can an cannot be done :oops: #-o

I've now attached the image to the post in a different way, so now everyone should be able to see it :mrgreen:

Mark
by 1024MAK
Sun Jun 17, 2018 10:46 am
Forum: stardot.org.uk
Topic: Post editing
Replies: 59
Views: 641

Re: Post editing

Further to my post just above. There exists an auto / quick draft module for this forum software. Another forum that I am a member of uses it. Here is a screenshot of me loading a saved draft:- IMG_7266.JPG Details of the extension are here https://www.phpbb.com/customise/db/extension/auto_drafts/ I...
by 1024MAK
Sun Jun 17, 2018 10:31 am
Forum: hardware
Topic: Master PSU repair - not going well
Replies: 14
Views: 374

Re: Master PSU repair - not going well

The diodes do indeed test okay :) The ceramic capacitor realistically cannot be tested properly, as the value of the resistor in parallel (due to the transformer coil having a very low resistance) means the meter will only read the value of the combined resistance in parallel. As the value of the re...
by 1024MAK
Sun Jun 17, 2018 10:17 am
Forum: stardot.org.uk
Topic: Post editing
Replies: 59
Views: 641

Re: Post editing

On the subject of composing posts, would members here like the admin team to look into adding an extension to the forum that vastly improves the draft functionality?

Mark
by 1024MAK
Sun Jun 17, 2018 10:15 am
Forum: stardot.org.uk
Topic: Post editing
Replies: 59
Views: 641

Re: Post editing

I for one get loads of typo, my brain just read what it thinks it typed. I get pc to read out text on important document and spell check with my ears. I'm fairly good at picking up my own errors when using a normal full sized keyboard and normal monitor on a PC. Especially with the aid of a spell c...
by 1024MAK
Sun Jun 17, 2018 9:57 am
Forum: hardware
Topic: Disc drive led: what drives it?
Replies: 8
Views: 176

Re: Disc drive led: what drives it?

daveejhitchins wrote:
Sun Jun 17, 2018 9:03 am
If it's of any help (?), here's how we did it on our IDE interface:
Which gives Power-on and Drive-activity in one LED (I still have some of these!).
Ahh yes, your cunning design to use a bi-colour two pin LED :D

Mark
by 1024MAK
Sun Jun 17, 2018 9:51 am
Forum: hardware
Topic: Disc drive led: what drives it?
Replies: 8
Views: 176

Re: Disc drive led: what drives it?

It is indeed likely that the 7406 inverter has failed. But before changing it, keep in mind that this chip has open-collector outputs. That is, it can only drive the output lines low. External pull-up resistors are needed to pull the outputs high. So it is worthwhile confirming that the pull-up resi...
by 1024MAK
Sat Jun 16, 2018 11:05 pm
Forum: stardot.org.uk
Topic: Post editing
Replies: 59
Views: 641

Re: Post editing

It's a result of the administrators making some 'behind the scenes' changes rather than a result of the upgrade. The reason being to allow better moderation of posts where the rules have been broken, or a poster has said something that is not acceptable. It was thought that this change would be seam...
by 1024MAK
Sat Jun 16, 2018 10:52 pm
Forum: software: other
Topic: BBC Micro Compendium by Jeremy Ruston
Replies: 33
Views: 943

Re: BBC Micro Compendium by Jeremy Ruston

On an Amstrad NC200...
IMG_7262.JPG
BASIC accuracy on an Amstrad NC200
Mark
by 1024MAK
Sat Jun 16, 2018 10:01 pm
Forum: hardware
Topic: Master PSU repair - not going well
Replies: 14
Views: 374

Re: Master PSU repair - not going well

Measuring resistance, the diodes gave around 1.5-1.8MΩ in one direction and either the same, or up to 8MΩ the other way - but it seemed to fluctuate a lot. With the meter in diode setting there were all consistently 0.5V one way (which is about the voltage drop you'd expect) and, equally expected, ...
by 1024MAK
Sat Jun 16, 2018 2:26 pm
Forum: hardware
Topic: Acorn Master and Electron cartridge breakout
Replies: 37
Views: 918

Re: Acorn Master and Electron cartridge breakout

My Jiffy bag of bits arrived today (see here).

Thank you fizzyade =D> =D> =D>

Mark
by 1024MAK
Sat Jun 16, 2018 2:23 pm
Forum: general
Topic: Today I received.....
Replies: 4629
Views: 311728

Re: Today I received.....

A kit of PCBs and parts for the Acorn Master and Electron cartridge breakout err, 'system'
IMG_7259.JPG
Acorn Master and Electron cartridge breakout
Thank you fizzyade =D> =D> =D>

Mark
by 1024MAK
Sat Jun 16, 2018 1:49 pm
Forum: hardware
Topic: Master PSU repair - not going well
Replies: 14
Views: 374

Re: Master PSU repair - not going well

My apologies, I forgot that some designs of the Master PSU use four individual diodes (to make a bridge rectifier circuit) instead of having a 'ready made' bridge rectifier :oops: I don't have a Master PSU open, or have any of my own photos. But here is one on Sprow's site: https://goo.gl/images/9t5...
by 1024MAK
Sat Jun 16, 2018 1:39 pm
Forum: for sale / freebies
Topic: Worth Taking a Look At
Replies: 2609
Views: 215204

Re: Worth Taking a Look At

Elminster wrote:
Sat Jun 16, 2018 11:54 am
I guess one persons junk is another’s treasure, certain people in my household think any computer with less than 32 bits is junk. :)
Computers with less than 32 bits are a bit rare. A ZX80 has 1024 bits and that's just the RAM... :lol:

Mark
by 1024MAK
Sat Jun 16, 2018 12:53 pm
Forum: hardware
Topic: Disc drive led: what drives it?
Replies: 8
Views: 176

Re: Disc drive led: what drives it?

Fixing an A5000 I have gotten as far as the desktop and the disc drive is now recognised. But it does not work yet. The led is constantly on and I get a “drive empty” error. From the circuit diagram I can’t find a specific signal that drives the drive led: Or is it the Sel2 line that does this? Tha...
by 1024MAK
Fri Jun 15, 2018 10:52 pm
Forum: hardware
Topic: Master PSU repair - not going well
Replies: 14
Views: 374

Re: Master PSU repair - not going well

Test using the resistance range, not the continuity range. Before proceeding, with the PSU disconnected from the supply, test for voltage across the large 250V electrolytic capacitors. If there is more than 10V, discharge each capacitor. See this post for details. If you don't have a suitable resist...