Search found 6207 matches

by 1024MAK
Thu Jun 22, 2017 6:53 pm
Forum: hardware
Topic: Help with voltage overload protection on Analogue in
Replies: 28
Views: 406

Re: Help with voltage overload protection on Analogue in

The Pots are Alpha B5k pots The book I referred to recommended 4k7 but I only have 5k. Does the metal casing of a D-sub socket need connecting to ground? The normal reason for connecting the metal case of D connectors (and pots) is for screening purposes. In order to reduce external interference an...
by 1024MAK
Wed Jun 21, 2017 10:12 pm
Forum: hardware
Topic: Dead A3010 help... PSU maybe?
Replies: 26
Views: 401

Re: Dead A3010 help... PSU maybe?

Well done :D

As small electrolytic capacitors don't cost much, I would recommend you renew C74 anyway.

Mark
by 1024MAK
Wed Jun 21, 2017 10:10 pm
Forum: hardware
Topic: Fitting an external keyboard to A3010/A3020
Replies: 2
Views: 49

Re: Fitting an external keyboard to A3010/A3020

Nice 8) =D>

Mark
by 1024MAK
Wed Jun 21, 2017 9:57 pm
Forum: hardware
Topic: Help with voltage overload protection on Analogue in
Replies: 28
Views: 406

Re: Help with voltage overload protection on Analogue in

Just a quick question: the connecting cables, are you using mono 3.5mm jack plugs to connect to the 3.5mm mono jack sockets? At the synthesiser end, does it have mono outputs or stereo outputs? Is the connector compatible? I mention this, because one thing that confuses people is that stereo 3.5mm j...
by 1024MAK
Wed Jun 21, 2017 4:50 pm
Forum: hardware
Topic: Metal case for EUP (Electron UPURS) - Interested?
Replies: 11
Views: 170

Re: Metal case for EUP (Electron UPURS) - Interested?

2 metal cases for me please. If you are short on numbers, I could be persuaded to have another one (total then 3)...

Mark
by 1024MAK
Tue Jun 20, 2017 1:30 pm
Forum: hardware
Topic: Pegasus, New AP5 and New AP3/4 Painted Metal case
Replies: 17
Views: 252

Re: Pegasus, New AP5 and New AP3/4 Painted Metal case

Hi Dave :D

1. Acorn colour preferred (and yes, willing to pay a bit more), or a similar cream colour but if not, white is okay.
2. I have two, so would want 2 cases please.
3. Yes please, I would like case for mine.

Mark
by 1024MAK
Sun Jun 18, 2017 2:49 pm
Forum: wanted
Topic: Wanted - Econet Clock
Replies: 3
Views: 89

Re: Wanted - Econet Clock

RIP the BeebMaster shop. But don't despair, he may still be able to sell you a clock...

Mark
by 1024MAK
Sun Jun 18, 2017 12:32 am
Forum: hardware
Topic: Huge bundle of goodies to go through
Replies: 14
Views: 409

Re: Huge bundle of goodies to go through

Only plugged in the floppies to find something odd happening after I took out a disc (I couldn't get one back in), then looking at it a small ring of scraping had developed on one side of the disc. I opened the floppies and found two metal head covers that fell out at me. They've lost their stickyn...
by 1024MAK
Sat Jun 17, 2017 3:09 pm
Forum: other vintage computer hardware, software and games
Topic: Sharp MZ-800 - a little presentation
Replies: 4
Views: 111

Re: Sharp MZ-800 - a little presentation

Nice :D =D>

I also have a machine with a quick disk drive, but only the drive, not the interface that goes in the expansion port :(
And also no disks...

Oh, and more pictures of you machine would be most welcome :D

Mark
by 1024MAK
Sat Jun 17, 2017 2:37 pm
Forum: hardware
Topic: Help with voltage overload protection on Analogue in
Replies: 28
Views: 406

Re: Help with voltage overload protection on Analogue in

Which is better, a zener or two signal diodes very much depends on what signal you are sending to the Beeb. How fast are the rise times and at what frequency, and how often does the signal exceed 1.8V? If your signal is often above 1.8V, consider increasing the value of the resistor. If you use two ...
by 1024MAK
Thu Jun 15, 2017 5:48 pm
Forum: hardware
Topic: OS RAM module
Replies: 39
Views: 997

Re: OS RAM module

Well done =D> =D> =D> Excellent news :D

I would like two module kits please.

Mark
by 1024MAK
Thu Jun 15, 2017 12:47 pm
Forum: other vintage computer hardware, software and games
Topic: Fixing a Superbrain up
Replies: 201
Views: 3233

Re: Fixing a Superbrain up

@Jon - proper job. Well done =D> =D> =D>

Mark
by 1024MAK
Mon Jun 12, 2017 12:05 am
Forum: for sale / freebies
Topic: BeebSCSI mini
Replies: 4
Views: 331

Re: BeebSCSI mini

paulv wrote:Sold out already! Are you planning on doing another run?

Paul

Yes, I missed the boat as well... :(

Mark
by 1024MAK
Sun Jun 11, 2017 9:27 am
Forum: other vintage computer hardware, software and games
Topic: Can someone explain why YUV output doesn't work?
Replies: 6
Views: 202

Re: Can someone explain why YUV output doesn't work?

Apparently YUV is component video or if I'm not mistaken,YPbPr. So, why won't my Einstein TC01 with the jumpers set from RGB to YUV as described in the Hardware manual display an image on my Samsung TV using the component inputs, just the message "mode not supported" is shown? What am I m...
by 1024MAK
Fri Jun 09, 2017 10:42 am
Forum: hardware
Topic: Dead A3010 help... PSU maybe?
Replies: 26
Views: 401

Re: Dead A3010 help... PSU maybe?

Whatever was causing the short has now damaged itself further due to the power from the PSU causing localised heating in the component. The bouncing voltage on the 5V line indicates that the "insulation" in the defective component kept "breaking down". It's now likely that the lo...
by 1024MAK
Thu Jun 08, 2017 10:29 pm
Forum: hardware
Topic: Palettemate / enhanced video ULA with 4096 colours
Replies: 314
Views: 9323

Re: Palettemate / enhanced video ULA with 4096 colours

dominicbeesley wrote:Excellent! I really really want some!

I think these will shift faster than hot cakes :mrgreen:

Please put me on the order list before I flood the place with drooling :D

Mark
by 1024MAK
Wed Jun 07, 2017 3:23 pm
Forum: hardware
Topic: PSU question.
Replies: 11
Views: 286

Re: PSU question.

Assuming the switching transistor is NOT working, and the two 100k resistors (R2, R3) and resistor R5 are all okay, about 40 seconds for them to discharge. If the switching transistor is working and the outputs work, should be less than 40 seconds. Note values calculated, 'cus I'm 40 miles away from...
by 1024MAK
Wed Jun 07, 2017 3:03 pm
Forum: other vintage computer hardware, software and games
Topic: Fixing a Superbrain up
Replies: 201
Views: 3233

Re: Fixing a Superbrain up

The 7406 are inverting buffers with open collector outputs that can switch external voltages of up to 30V. They are unable to source (output) any voltage themselves (they can however "sink" 40mA to 0V/GND). In the disk drive circuits, there are either pull-up resistors to the +5V line in t...
by 1024MAK
Wed Jun 07, 2017 2:47 pm
Forum: hardware
Topic: Round the Back of my master Compact
Replies: 5
Views: 187

Re: Round the Back of my master Compact

The serial port will only be operational if the serial chip is fitted on the main board ( link ). Mark at RetroClinic may have the parts if you need them. Back in the 1980s, RS232 serial ports could "talk" to lots of different devices, not just modems and printers. These days, the serial p...
by 1024MAK
Wed Jun 07, 2017 2:35 pm
Forum: hardware
Topic: A Master List for New Retro Kit
Replies: 78
Views: 1878

Re: A Master List for New Retro Kit

I think that's enough discussion about copyright and licensing for this thread. You can of course open a new thread if you wish to discuss this further.

Now back to the hardware please...

Mark
by 1024MAK
Wed Jun 07, 2017 2:17 pm
Forum: hardware
Topic: PSU question.
Replies: 11
Views: 286

Re: PSU question.

It should run without a load, but I think the auxiliary supply voltages will be out of spec. So use a load. I use a 6V 4W lamp.

Mark
by 1024MAK
Wed Jun 07, 2017 1:01 am
Forum: hardware
Topic: Master internal modem connector
Replies: 44
Views: 2539

Re: Master internal modem connector

That looks much better =D>

One thing that I forgot to say, if you do need pads with bigger holes, the pad diameter may need to be increased, or after the hole is drilled, there won't be much pad to solder to...

Mark
by 1024MAK
Wed Jun 07, 2017 12:53 am
Forum: software: other
Topic: Turning off Keyboard Echo
Replies: 12
Views: 224

Re: Turning off Keyboard Echo

Don't we get the '*'s as we tap each key then :(

Oh and don't forget the annoying bleep for each key... :mrgreen:

Mark
by 1024MAK
Tue Jun 06, 2017 10:13 pm
Forum: other vintage computer hardware, software and games
Topic: Fixing a Superbrain up
Replies: 201
Views: 3233

Re: Fixing a Superbrain up

If you unplug the FDC (Z93) and use some very thin solid core wire, you can set the voltage levels on the output buffer chips and confirm that the output pins of the buffer chips work correctly. As a final check, you can remove your temporary wiring, put the FDC back in, connect a dual channel 'scop...
by 1024MAK
Tue Jun 06, 2017 5:45 pm
Forum: hardware
Topic: Master internal modem connector
Replies: 44
Views: 2539

Re: Master internal modem connector

Keep going Simon :D Here are some hints:- The tracks that are for +5V and 0V/GND should be a lot thicker. Where possible, make them at least 3mm wide. With the 0V/GND, where possible, you can make it as wide as possible. Your PCB package should have some settings to set the minimum track width and t...
by 1024MAK
Mon Jun 05, 2017 3:39 pm
Forum: hardware
Topic: Electron os/basic rom failed- replacing with eprom?
Replies: 7
Views: 213

Re: Electron os/basic rom failed- replacing with eprom?

The access speed of the EPROM should not be a problem, as long as it is the same or faster than the ROMs that are normally fitted. Some computer systems however aren't happy with CMOS EPROMs. Can you please verify the EPROM that you programmed. By this I mean, use the programmer to read it back, the...
by 1024MAK
Mon Jun 05, 2017 9:04 am
Forum: software: games
Topic: "Adventure Island" Does anyone know it??
Replies: 21
Views: 2025

Re: "Adventure Island" Does anyone know it??

As a newbie, you can receive PMs but cannot reply to, or send any PMs. Interact some more by posting, or contact an administrator and ask . Also pop over here and have a read. Tell us all about yourself in the introduce yourself topic :wink: You can make your confession here :mrgreen: Put yourself o...

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