Search found 2839 matches

by Prime
Thu Apr 02, 2020 5:00 am
Forum: off-topic
Topic: Which retro calculator is best?
Replies: 23
Views: 571

Re: Which retro calculator is best?

My Casio FX-82 pretty much got me through my O and A levels. Only thing it doesn't have is base conversion which is a shame.

Cheers.

Phill.
by Prime
Fri Mar 27, 2020 11:57 pm
Forum: other vintage computer hardware, software and games
Topic: Dragon 32 Ram upgrade issue
Replies: 5
Views: 248

Re: Dragon 32 Ram upgrade issue

Did you cut the tracks as directed in the upgrade guide, if so have you put those back?

Cheers.

Phill.
by Prime
Thu Mar 26, 2020 7:22 pm
Forum: other vintage computer hardware, software and games
Topic: Dragon 32 Ram upgrade issue
Replies: 5
Views: 248

Re: Dragon 32 Ram upgrade issue

I've attempted the standard upgrade detailed here as I have 8 64bit ram chips http://archive.worldofdragon.org/index.php?title=Dragon_32_-_64K_Upgrade but I'm getting this screen. Anyone got any ideas what might be wrong. Tried with ic33 pin 8 GND connected and not connected. Seems strange that the...
by Prime
Mon Mar 16, 2020 3:53 pm
Forum: upcoming and recent events & exhibitions
Topic: ABUG SOUTH 13 to 15 November 2020 - Save the Date - NOT A BOOKING THREAD
Replies: 12
Views: 532

Re: ABUG SOUTH 13 to 15 November 2020 - Save the Date - NOT A BOOKING THREAD

All things being equal I should hopefully be able to be there.

Cheers.

Phill.
by Prime
Sun Mar 15, 2020 7:56 pm
Forum: other vintage computer hardware, software and games
Topic: Dragon 32 Rom fault
Replies: 9
Views: 434

Re: Dragon 32 Rom fault

You may find you need to connect VPP to VCC eg 5v.

Cheers.

Phill.
by Prime
Sun Mar 08, 2020 1:10 pm
Forum: upcoming and recent events & exhibitions
Topic: ABUG Cambridge Booking Thread - May 15-17th 2020
Replies: 35
Views: 1273

Re: ABUG Cambridge Booking Thread - May 15-17th 2020

Can now confirm my attendence :) :)

Cheers

Phill.
by Prime
Sat Mar 07, 2020 5:51 pm
Forum: upcoming and recent events & exhibitions
Topic: ABUG Cambridge Booking Thread - May 15-17th 2020
Replies: 35
Views: 1273

Re: ABUG Cambridge Booking Thread - May 15-17th 2020

I should be able to make that weekend, but need to check wioth Lesley....

Tenatively put me down for a full table please.

Cheers.

Phill.
by Prime
Tue Mar 03, 2020 3:46 pm
Forum: archive submissions
Topic: Phoebe Schematics rev 1
Replies: 8
Views: 497

Re: Phoebe Schematics rev 1

Multiwizard wrote:
Tue Mar 03, 2020 2:21 pm
Arcadian wrote:
Tue Mar 03, 2020 2:16 pm
Now we just need Prime to clone and build it ... ! ;)
Hear hear... 8) =D>
Getting hold of some of the custom chips could be um....challenging......

Cheers.

Phill.
by Prime
Mon Mar 02, 2020 10:34 pm
Forum: off-topic
Topic: Licence advice....
Replies: 20
Views: 828

Re: Licence advice....

Thanks for the input all, plenty to considder there.

On the subject of the hardware design files, I do plan to open those once (most of) the current batch of DragonMMC boards has sold.

Cheers.

Phill.
by Prime
Mon Mar 02, 2020 1:19 pm
Forum: off-topic
Topic: Licence advice....
Replies: 20
Views: 828

Licence advice....

Right so I want to release the sources to the 6809, AVR and CPLD code for DragonMMC. I'm not currently releaseing the schamatic / board files whilst it is still in production at Bas' request. But i want some advice on what License to use for the source release. Ideally I want, to allow people to dow...
by Prime
Mon Mar 02, 2020 12:18 pm
Forum: other vintage computer hardware, software and games
Topic: Dragon 32 Rom fault
Replies: 9
Views: 434

Re: Dragon 32 Rom fault

Does anyone know where I can get the original Dragon 32 rom files specifically for IC18 ? Working from the Schematic, IC18 is the lower ROM from $8000-$9FFF, the Dragon archive has a Dragon 32 ROM : http://archive.worldofdragon.org/browse/downloads/Roms/Dragon/Dragon%20Data%20Ltd%20-%20Dragon%2032%...
by Prime
Thu Feb 27, 2020 6:51 pm
Forum: other vintage computer hardware, software and games
Topic: Dragon 32 Fault
Replies: 5
Views: 332

Re: Dragon 32 Fault

this to work as when I touched the 14.218Mhz crystal (x2) I got a cursor to appear sometimes and then by gently pressing the crystal between finger and thumb I could get the machine to boot!! I've tried swapping the crystal but still the same so I'm going to do some testing of components connected ...
by Prime
Wed Feb 26, 2020 11:39 pm
Forum: hardware
Topic: 21st Century BBC Micro?
Replies: 14
Views: 695

Re: 21st Century BBC Micro?

For me at least, I'm not that interested in things like the C64 and the spectrum next. Yes they look like the originals but open the case and they're a little board with a big FPGA and some support circuitry. There's none of the potential for tinkering and expansion like there is with the original m...
by Prime
Sun Feb 23, 2020 10:11 pm
Forum: acorn atom and system
Topic: My 'new' Acorn Atom
Replies: 12
Views: 440

Re: My 'new' Acorn Atom

Glad you got it working :) Yes those white Acorn sockets where a bit crap, though before replacing the 8255 socket it may be worth cleaning it's pins and possibly re-flowing the solder on the socket's pins. If you want a RAMROM board, I've just taken delivery of the latest version of the board, and ...
by Prime
Sun Feb 23, 2020 2:34 pm
Forum: other vintage computer hardware, software and games
Topic: Floppy drive power connector
Replies: 2
Views: 127

Re: Floppy drive power connector

These are the ones I used on the BeebSID board :

https://uk.farnell.com/amp-te-connectiv ... dp/1056115

Cheers.

Phill.
by Prime
Wed Feb 19, 2020 6:55 pm
Forum: software: other
Topic: Acorn System 5 Software
Replies: 6
Views: 239

Re: Acorn System 5 Software

If you post the images I can fire up my system 5 and try them.

The machine has an econet board too, which may help.

Cheers.

Phill.
by Prime
Tue Feb 18, 2020 11:45 pm
Forum: other vintage computer hardware, software and games
Topic: Tatuing Einstein 256 Power without Monitor
Replies: 5
Views: 237

Re: Tatuing Einstein 256 Power without Monitor

Don't know if you have the manual, I'll attach a pdf of it, but it has a pinout of the power / video connector.
Seems to take +12V and +5V DC.

I've uploaded it here : http://penguin.stats.warwick.ac.uk/~stsxab/Einstein/ as it was too big for stardot....

Cheers,

Phill.
by Prime
Sun Feb 16, 2020 5:59 pm
Forum: other vintage computer hardware, software and games
Topic: Dragon 32 Fault
Replies: 5
Views: 332

Re: Dragon 32 Fault

Which Dragon motherboard do you have?

Pictures of the motherboards can be found here :

http://www.archive.worldofdragon.org/in ... d_Pictures

I rather suspect a ram problem, I don't think placing a 4164 over a 4116 is going to work correctly either :(

Cheers.

Phill.
by Prime
Sun Feb 16, 2020 5:56 pm
Forum: acorn atom and system
Topic: ICE T65/Z80/6809
Replies: 877
Views: 73017

Re: ICE T65/Z80/6809

Hi all, I'm still using the Godil (for the 6809) and the cheap Spartan board + Jason's adapter for the 6502. I know that Hoglet has a new set of interface boards for the various CPU cores, couuld you update me on what I need. Ideally I'd like to get the three interface boards + 3 of the FPGA boards ...
by Prime
Sun Feb 16, 2020 2:35 pm
Forum: hardware
Topic: Help Finding Replacement AC/DC Adapter
Replies: 4
Views: 172

Re: Help Finding Replacement AC/DC Adapter

Also remember that the output doesn't have to match exactly, as long as the voltage is the same E.g. something like this : https://www.rapidonline.com/tt-electronics-sw3110b-12-25w-psu-5v-2-5a-85-2940 Would be a suitable replacement as it's 5V 2.5A. I uses these to run my Atoms / Master Compact on. ...
by Prime
Wed Feb 12, 2020 1:48 pm
Forum: acorn atom and system
Topic: Two dead Atoms! Life Support possible?
Replies: 13
Views: 549

Re: Two dead Atoms! Life Support possible?

Also a simple test to see if the atom is alive** even if you have a fault in the video circuit is type CTRL-G (hold CTRL down whilst repeatedly pressing G), you should hear it beep.

**Alive in as far as CPU/ROM/RAM working and it's reaching basic.

Cheers.

Phill.
by Prime
Sat Feb 08, 2020 6:37 pm
Forum: acorn atom and system
Topic: It lives!
Replies: 16
Views: 714

Re: It lives!

What keyboard switches did you exactly use/order ? Especially also the space bar ? These are the keycaps I used : https://www.overclockers.co.uk/glorious-pc-gaming-race-abs-doubleshot-105-keys-black-uk-layout-kb-00e-gr.html Like I say for A..Z and 1..0 they are mostly correct. Some of the other key...
by Prime
Fri Feb 07, 2020 10:22 pm
Forum: acorn atom and system
Topic: It lives!
Replies: 16
Views: 714

Re: It lives!

danielj wrote:
Fri Feb 07, 2020 10:18 pm
Nice and clicky?
Not as good as my IBM model M but yes the Cherry/Gatron keys are clicky :)

Cheers.

Phill.
by Prime
Fri Feb 07, 2020 9:32 pm
Forum: acorn atom and system
Topic: It lives!
Replies: 16
Views: 714

Re: It lives!

Right,

AtoMMC is working and seems to run OK as a standard 6K+6K Atom.

Next to test some plug in addons.....
P1000585.JPG
P1000587.JPG
OK so the PC keys are not perfect, but better than typing on bare switches....and at least most of them sort of match :)
P1000586.JPG
Cheers.

Phill.
by Prime
Fri Feb 07, 2020 1:45 pm
Forum: acorn atom and system
Topic: It lives!
Replies: 16
Views: 714

Re: It lives!

Small update..... Switches and missing sockets have arrived and been fitted.....though it's a real pain typing without any keycaps to give clues :) :) I do have a set of PC style cherry keycaps on order which while not perfect will be significantly better :) :) AtoMMC rom blown and plugged into #A00...
by Prime
Tue Feb 04, 2020 9:39 am
Forum: acorn atom and system
Topic: It lives!
Replies: 16
Views: 714

Re: It lives!

Phill, that’s definitely what I call a minimalist Atom :mrgreen: #-o Minimum required to make it to basic.....The chip sockets for the RAM arrived this morning so I'll fit those over the next couple of days and test with full RAM & FP ROM. Still waiting on keyswitches and power socket..... I may bu...
by Prime
Mon Feb 03, 2020 10:42 pm
Forum: acorn atom and system
Topic: It lives!
Replies: 16
Views: 714

It lives!

Hi all, With thanks to JudgeBeeb for all his hard work tracing and replicating the Atom board...... P1000584.JPG P1000582.JPG Of course I can't actually do anything with it until the keyswitches arrive, and also waiting my Rapid order so I can populate the rest of the ram sockets. Cheers. Phill.
by Prime
Sat Feb 01, 2020 12:45 am
Forum: acorn atom and system
Topic: Atom RAMROM V3.xnk
Replies: 0
Views: 211

Atom RAMROM V3.xnk

Hi all,

A couple of people asked me about expanding Atoms at ABUG last week, I've just ordered some more RAMROM boards from allpcb**, so should be set to make some for people if they want.

**may take a couple of weeks because of holidays in China.

Cheers.

Phill.
by Prime
Sat Feb 01, 2020 12:41 am
Forum: wanted
Topic: Acorn Atom cost?
Replies: 3
Views: 343

Re: Acorn Atom cost?

In the same way that the ZX80 (sold about 80K) is perceved as rare compared to the more common ZX81 (sold over a million IIRC) & Spectrum. I think the Atom has this perception that it is 'rare' because there are less of them than ther are BBCs, but like ZX80s there are normally a couple of them on e...
by Prime
Sun Jan 26, 2020 2:10 pm
Forum: upcoming and recent events & exhibitions
Topic: Items left behind after ABUG SOUTH (24 to 26 January 2020)
Replies: 5
Views: 399

Re: Items left behind after ABUG SOUTH (24 to 26 January 2020)

Oops yes thats mine, if someone could put it aside and bring to next one I'd be most greatful.....

Cheers.

Phill.