Search found 6315 matches

by 1024MAK
Tue Jul 25, 2017 5:20 pm
Forum: hardware
Topic: How's by BBC doing?
Replies: 4
Views: 190

Re: How's by BBC doing?

Well, I can't see anything in the photos...

If you think it is damp, leave it in a nice dry warm area for a couple of days.

Carefully inspect the board, including the chips and all other components for any mould. If it looks okay, try powering it up :D

Mark
by 1024MAK
Tue Jul 25, 2017 4:58 pm
Forum: hardware
Topic: Serial port modem?
Replies: 9
Views: 302

Re: Serial port modem?

Not pixes then? I always thought litle pixies were rubbing the copper from my landline, then other pixies were shining torches down a glass tube. You mean if I open that green box at the end of my room there will be not one pixie in it? Are you sure? Really sure? Yeah, "pixies" usually ma...
by 1024MAK
Tue Jul 25, 2017 3:28 pm
Forum: hardware
Topic: Serial port modem?
Replies: 9
Views: 302

Re: Serial port modem?

Every modem I've ever used has plugged into the serial port. Quite majorly misnamed, I think. A modem is a device that modulates and demodulates digital signals to/from analogue sine waves so that the signals can travel via normal telephone exchange and transmission systems. Required because teleph...
by 1024MAK
Mon Jul 24, 2017 4:09 pm
Forum: hardware
Topic: How's by BBC doing?
Replies: 4
Views: 190

Re: How's by BBC doing?

The probes (or IC test clips) are there to pick up additional signals for that combined sideways RAM and ROM board you have fitted to your machine.
For the rest of my reply, click here...

Mark
by 1024MAK
Mon Jul 24, 2017 3:53 pm
Forum: other vintage computer hardware, software and games
Topic: 386 Restoration
Replies: 1
Views: 83

Re: 386 Restoration

- Instead of 4096k RAM the BIOS displays 3840k, which is 256k short. The board won't accept more than 4mb RAM, which is probably a design limitation given small size of the board. That’s more than likely the "memory hole" for the BIOS ROM and the I/O card boot ROM space. Or for Video RAM....
by 1024MAK
Mon Jul 24, 2017 3:36 pm
Forum: acorn atom
Topic: ICE T65/Z80/6809
Replies: 381
Views: 17944

Re: ICE T65/Z80/6809

I think either you are agreeing with what I just said or trying to mess with my mind and makes me like zx81's (no chance, the keyboard drives me nuts). Err, not actually telling you to play with, or get a ZX81 :lol: Merely suggesting that you design and build your own simple single board computer. ...
by 1024MAK
Mon Jul 24, 2017 3:26 pm
Forum: off-topic
Topic: Retr0brite problems
Replies: 10
Views: 182

Re: Retr0brite problems

Hmm, not keen on that idea. You only need a hole or tear in the cling film and the peroxide could then drip into the switches and then onto the PCB :twisted: And of course, if (as they should be) the caps are a tight fit on the switch stems, pushing the two together may well break the cling film. So...
by 1024MAK
Mon Jul 24, 2017 3:12 pm
Forum: acorn atom
Topic: ICE T65/Z80/6809
Replies: 381
Views: 17944

Re: ICE T65/Z80/6809

I started with hardware by reading the Maplin Magazine, Everyday Electronics and Practical Electronics many, many years ago. I also did a course at college which included digital electronics, both digital logic and programming on a AIM-65: http://www.decadecounter.com/vta/pic/aim65_1.jpg This is a 6...
by 1024MAK
Mon Jul 24, 2017 7:08 am
Forum: general
Topic: Today ZAP museum received....
Replies: 47
Views: 1546

Re: Today ZAP museum received....

Exactly, and I believe that was his aim. To sell computers that ordinary people could afford. And to include as many features as possible within the price range he set. Often his aspirations exceeded what people including his employees at first thought possible. This was I believe, a continuation of...
by 1024MAK
Sun Jul 23, 2017 6:33 pm
Forum: acorn atom
Topic: Is there still any interest for Atom2k15 boards
Replies: 13
Views: 359

Re: Is there still any interest for Atom2k15 boards

Interesting use of a serial port level shifter 8)

Mark
by 1024MAK
Sat Jul 22, 2017 3:08 pm
Forum: hardware
Topic: What would be a suitable D2A resister ladder for the beeb
Replies: 4
Views: 118

Re: What would be a suitable D2A resister ladder for the beeb

The value of the resistors used needs to be high enough such that the digital outputs are not loaded too much. The output voltage of digital outputs at higher output currents will be less than you expect (for the logic 1) or higher than you expect (for the logic 0). At the same time, you don't want ...
by 1024MAK
Sat Jul 22, 2017 7:47 am
Forum: hardware
Topic: Palettemate / enhanced video ULA with 4096 colours
Replies: 402
Views: 12663

Re: Palettemate / enhanced video ULA with 4096 colours

Anyone know if there were other issues of Master MB? I assumed only one. I have at least two Masters with issue 2 boards. Odd definitely looks like 6522s are ic5 & 8 on this MB, checked the schematics on mdfs.net and says one of them should be ic6 (6 & 8 in fact). But that doesn't look like...
by 1024MAK
Sat Jul 22, 2017 7:33 am
Forum: acorn atom
Topic: ICE T65/Z80/6809
Replies: 381
Views: 17944

Re: ICE T65/Z80/6809

flynnjs wrote:@Mark I meant zero Ohm.

Ahh, now if you had put "0 R" I would have got it right away... :lol:

Mark
by 1024MAK
Sat Jul 22, 2017 4:03 am
Forum: general
Topic: Today ZAP museum received....
Replies: 47
Views: 1546

Re: Today ZAP museum received....

Yeah, the problem is, a lot of people have character flaws just as bad as Sinclair. Sinclair did indeed have some dubious business practices. But as with any area of life, people need to read more than just one text on a subject. Because you should never rely on a single source. As to products that ...
by 1024MAK
Fri Jul 21, 2017 6:56 pm
Forum: hardware
Topic: Palettemate / enhanced video ULA with 4096 colours
Replies: 402
Views: 12663

Re: Palettemate / enhanced video ULA with 4096 colours

Yay, the postie delivered mine today.

Picture tomorrow :D

Thanks Rob =D>

Mark
by 1024MAK
Fri Jul 21, 2017 4:20 pm
Forum: hardware
Topic: Upgrading a BBC Master power supply with a modern 60W supply
Replies: 23
Views: 580

Re: Upgrading a BBC Master power supply with a modern 60W supply

I don't know about your Master, but in mine, the noise is from the loudspeaker and has nothing to do with the PSU.

Most Beebs produce noises from their loudspeakers.

Mark
by 1024MAK
Fri Jul 21, 2017 7:36 am
Forum: acorn atom
Topic: ICE T65/Z80/6809
Replies: 381
Views: 17944

Re: ICE T65/Z80/6809

‪‪So if I am reading this right, the following members are currently interested in one of Jason's adaptor boards:‪ ⋅ Elminster ⋅ ‪Dave (hoglet)‪ ⋅ ‪Charlie (sirmorris)‪ ⋅ Mark (1024MAK)‪ ⋅ Daniel (‪danielj)‬ ‪(If I have misread your chat, bung me an ...
by 1024MAK
Fri Jul 21, 2017 7:14 am
Forum: acorn atom
Topic: ICE T65/Z80/6809
Replies: 381
Views: 17944

Re: ICE T65/Z80/6809

@Charlie one side of the board you have just pull ups and the other side you leave unpopulated except where you want to connect a pin to 5v or 0v. Of course you could just replace one of the pullups with 0r but that makes it a pain to swap between say 6502 and z80 etc. 0r :?: Or do you mean 0V ? Ma...
by 1024MAK
Thu Jul 20, 2017 9:06 pm
Forum: hardware
Topic: Just dug out my old beeb
Replies: 9
Views: 193

Re: Just dug out my old beeb

Well, I've got some. But as they were not bought for use with Beeb PSUs, they may not be the correct size...

And yes, RetroClinic will likely have some.

Mark
by 1024MAK
Thu Jul 20, 2017 8:33 pm
Forum: hardware
Topic: Just dug out my old beeb
Replies: 9
Views: 193

Re: Just dug out my old beeb

noticed that where the white wire comes out of the power supply theres no black bit to hold the wire in place. for the time being I've used blue tac to hold it into place. The black plastic clips that protect and hold cable in metal cases or panels are called an Anixter Strain Relief Bush (although...
by 1024MAK
Thu Jul 20, 2017 3:49 pm
Forum: general
Topic: Today ZAP museum received....
Replies: 47
Views: 1546

Re: Today ZAP museum received....

Jon - Zarchos is no longer on this forum.

Mark
by 1024MAK
Thu Jul 20, 2017 1:54 pm
Forum: hardware
Topic: AtoMMC on the Beeb's 1mhz bus.
Replies: 29
Views: 372

Re: AtoMMC on the Beeb's 1mhz bus.

The problem is that data has to be stored on modern media. We want to have easy access to the files from both a PC and from the Beeb. While having a system that is compatible as possible with Acorns DFS and ADFS so that games and other applications will load on the Beeb without problems. So either t...
by 1024MAK
Thu Jul 20, 2017 1:32 pm
Forum: general
Topic: Today ZAP museum received....
Replies: 47
Views: 1546

Re: Today ZAP museum received....

I have not read any of that book. But, it sounds like the author of the book is biased. There are ALWAYS compromises in all forms of engineering. The trick is to produce a product that works and at a price that means people will buy it. Although some of Sinclairs products flopped, the ZX80, ZX81, ZX...
by 1024MAK
Wed Jul 19, 2017 6:25 pm
Forum: acorn atom
Topic: ICE T65/Z80/6809
Replies: 381
Views: 17944

Re: ICE T65/Z80/6809

If there is a suitable and practical new arrangement, I would be interested.

I have visited Trenz's web site looking for GODILs many times over the last few years. Every time, the 40 pin DIL type has been shown as out of stock :(

So a new solution would be gratefully received [-o<

Mark
by 1024MAK
Wed Jul 19, 2017 6:21 pm
Forum: off-topic
Topic: Retr0brite problems
Replies: 10
Views: 182

Re: Retr0brite problems

UV LEDs: Keep in mind that a lot of things are advertised as having UV LEDs, but the UV LEDs only output light in the visible part of the Spectrum, so don't actually output any UV light... Where as proper UV tubes do output UV light. The key is to look at the specifications. If the seller/supplier d...
by 1024MAK
Wed Jul 19, 2017 3:00 pm
Forum: hardware
Topic: Palettemate / enhanced video ULA with 4096 colours
Replies: 402
Views: 12663

Re: Palettemate / enhanced video ULA with 4096 colours

I was at work :cry:
image.jpg

Mark
by 1024MAK
Wed Jul 19, 2017 2:22 pm
Forum: off-topic
Topic: Retr0brite problems
Replies: 10
Views: 182

Re: Retr0brite problems

Are you sure that the wavelength of the EPROM's UV light is suitable for this? There are various "bands" of UV light. Normally when Retr0briting, users report either using sunlight or a sun bed UV lamp (as used for tanning skin). In electronics, the UV lamp used for EPROMs is a different w...
by 1024MAK
Wed Jul 19, 2017 2:10 pm
Forum: general
Topic: Today I received.....
Replies: 4026
Views: 202890

Re: Today I received.....

What is it? Clearly you have been asleep for the last 6 months if you need to ask that :evil: He's been in deep, very deep, so deep, that the light from the sun never reaches the void. Up to his eyes in repairing some massive dinosaurs :lol: The name of the dinosaur? Why it's Superbrain of course. ...
by 1024MAK
Tue Jul 18, 2017 7:10 pm
Forum: hardware
Topic: 6809 experiments
Replies: 86
Views: 2808

Re: 6809 experiments

Systems that use word sizes larger than eight bits may load the entire word in a single operation. Further some can use more than one eight bit byte of a word for some operations. In this context, storing data in a "left to right" order does not sound like such a bad thing... Especially wh...
by 1024MAK
Tue Jul 18, 2017 6:39 pm
Forum: coordination of magazine scanning projects
Topic: OCR of magazine listings
Replies: 8
Views: 175

Re: OCR of magazine listings

sydney wrote:That wasn't as helpful as I thought- feel free to ignore it as I'd just woken from a nap.

I hope you had a better snooze than I did...

Mark

Go to advanced search