Search found 477 matches

by IanS
Wed Feb 15, 2017 8:07 pm
Forum: hardware
Topic: A5000 Sound/Speaker
Replies: 2
Views: 192

Re: A5000 Sound/Speaker

The internal speaker is not disabled by connecting to the headphone socket (as you found). The internal speaker has a separate software controlled mute signal.

There is a setting in the !Configure app (under Sounds) for the internal speaker.
by IanS
Tue Feb 14, 2017 9:11 pm
Forum: hardware
Topic: Econet hub
Replies: 10
Views: 631

Re: Econet hub

The biasing bits are basically what the terminators do. When no station is driving the network the ADLC needs to be able to reliably detect that the network is undriven and therefore free for use, to this end undriven data lines must appear as a continuous stream of logic ls and not random noise whi...
by IanS
Mon Feb 13, 2017 9:58 pm
Forum: hardware
Topic: Econet hub
Replies: 10
Views: 631

Re: Econet hub

Three econet cards (and an ANFS rom) to build an Econet between my Beebs and Archimedes… You can also some ATtiny45 chips to build a clock following Simon's design and my 'Econet Hub' (8 5-pin DIN sockets mounted on a piece of veroboard -- seems easier than trailing cables and socket boxes, if it w...
by IanS
Mon Feb 13, 2017 9:46 pm
Forum: hardware
Topic: Super-simple Econet Clock design
Replies: 13
Views: 1299

Re: Super-simple Econet Clock design

When we were running my clock PCB (using your ATTiny code) at the Abug meeting, the slowest speed was a bit fast for transferring large files. It's also a bit quick for the Atom. We ended up using my old clock which runs at about 160kHz. I've since modified the code to have a 255(96), 196(64) and 18...
by IanS
Sat Feb 11, 2017 4:06 pm
Forum: hardware
Topic: Keyboard Repair
Replies: 10
Views: 722

Re: Keyboard Repair

The cable length gives a clue as to the machine it was for. That's just cruel Ian..... :lol: Someone has cut off the cable :shock: Ooops, didn't notice that bit. In an attempt to be useful, I've taken the top case from a keybord that looks like the one in the picture. Here are the connections I fou...
by IanS
Sat Feb 11, 2017 2:40 pm
Forum: hardware
Topic: Keyboard Repair
Replies: 10
Views: 722

Re: Keyboard Repair

If the keyboard has a mouse connector then it's for A3/4/5xx(x) machines.

The cable length gives a clue as to the machine it was for. The A3/4/5xx keyboards had quite short cables as they plugged in at the front of the machine. The A4/5xxx keyboards had longer cables as they plugged in at the rear.
by IanS
Wed Jan 25, 2017 8:21 pm
Forum: past events & exhibitions
Topic: ABug EAST MIDLANDS 27-29 January 2017 (Leicestershire)
Replies: 130
Views: 8382

Re: ABug EAST MIDLANDS 27-29 January 2017 (Leicestershire)

What time are people planning to get there on Friday?

Is anyone bringing an Eprom programmer that can handle a 2532 (for an Atom). Or a 21V 2764?
by IanS
Sun Jan 22, 2017 10:32 pm
Forum: past events & exhibitions
Topic: May 12th-14th 2017 Cambridge ABUG (FULL) & Acorn World event at CCfCH
Replies: 190
Views: 12264

Re: May 12th-14th 2017 Cambridge ABUG & Acorn World event at CCfCH

jbnbeeb wrote:
IanS wrote:Are zombiedog & z0m8ied0g different people? (Or is it a cunning plan to get a full table?).


:lol: and :oops: I've edited the list so we only have one z0m8ied0g !

Still got Sydney x 2 in the list.
by IanS
Sun Jan 22, 2017 9:00 pm
Forum: past events & exhibitions
Topic: May 12th-14th 2017 Cambridge ABUG (FULL) & Acorn World event at CCfCH
Replies: 190
Views: 12264

Re: May 12th-14th 2017 Cambridge ABUG & Acorn World event at CCfCH

Are zombiedog & z0m8ied0g different people? (Or is it a cunning plan to get a full table?)

I plan to do the full weekend, Friday to Sunday.
by IanS
Sun Jan 22, 2017 4:14 pm
Forum: hardware
Topic: Super-simple Econet Clock design
Replies: 13
Views: 1299

Re: Super-simple Econet Clock design

The output pins from the CPU go to opposite corners of the 4-pin header (P5), so I can easily swap the polarity, or disconnect entirely. And either output pin can feed the line driver.
by IanS
Sun Jan 22, 2017 3:07 pm
Forum: hardware
Topic: Super-simple Econet Clock design
Replies: 13
Views: 1299

Re: Super-simple Econet Clock design

So I built a new clock based on this design:- IMG_20170122_144602198.jpg It has USB power input, and the facility to add a "proper" line driver (just so I could do some comparison), power indicator, and data line biasing to avoid needing a teminator on small (and large it seems) networks. ...
by IanS
Sun Jan 22, 2017 12:00 pm
Forum: other vintage computer hardware, software and games
Topic: PCB design and fabrication
Replies: 6
Views: 605

Re: PCB design and fabrication

Did you see the other thread about pcb design - http://stardot.org.uk/forums/viewtopic.php?f=3&t=12207 I think the general opinion if you aren't already used to some other tool, try Kicad. I got up and running with Kicad using this tutorial - https://contextualelectronics.com/learning/getting-to...
by IanS
Sat Jan 21, 2017 10:43 pm
Forum: acorn atom
Topic: Prime's ROM/RAM board
Replies: 14
Views: 1189

Re: Prime's ROM/RAM board

Have you asked Prime?
by IanS
Wed Jan 18, 2017 6:35 pm
Forum: for sale / freebies
Topic: Offered: Matchbox sized 6502 / Z80 / 6809 Co Pro
Replies: 595
Views: 49696

Re: Offered: Matchbox sized 6502 / Z80 / 6809 Co Pro

flynnjs wrote:Just a little update. All the construction was done and I'm just programming and testing. Hope to post out by weekend.

Is it easier to bring mine along to the Abug meet?
by IanS
Fri Jan 06, 2017 11:48 pm
Forum: past events & exhibitions
Topic: May 12th-14th 2017 Cambridge ABUG (FULL) & Acorn World event at CCfCH
Replies: 190
Views: 12264

Re: May 12th-14th 2017 Cambridge ABUG & Acorn World event at CCfCH

Fantastic, it was great last time. Stick me down when you start a list. Maybe try a different restaurant for the evening meal. I don't think I have any Acorn gear or artifacts that the centre won't have, other than an Acorn Umbrella, but it looks a bit manky as it has spent the last two decades roll...
by IanS
Fri Jan 06, 2017 11:34 pm
Forum: past events & exhibitions
Topic: ABug North 18/19/20 November 2016, Bolton
Replies: 199
Views: 12238

Re: ABug North 18/19/20 November 2016, Bolton

If anyone I bored at Bolton with pictures of the Atom Econet PCB I'd had made at OSH Park was interested in how they turned out, they arrived in the post today. It works :D :D :D If I did it again, I'd change a few things, but it didn't require any bodge wires, so I'm happy. IMG_20161130_203138584_...
by IanS
Mon Jan 02, 2017 2:19 pm
Forum: hardware
Topic: Econet pinout
Replies: 9
Views: 669

Re: Econet pinout

flynnjs wrote:
IanS wrote:So whilst the 5-pin din pin 3 is the clock+ in diagrams and socket boxes, it's actually the polarity of clock- signal which is used by the ADLC.


Not all diagrams:

I should have been clearer, I wasn't referring to circuit diagrams.
by IanS
Sun Jan 01, 2017 8:08 pm
Forum: hardware
Topic: Econet pinout
Replies: 9
Views: 669

Re: Econet pinout

It looks like whoever made this econet add-on for the beeb got confused by the pinout and have swapped the clock signals over. http://beebmaster.co.uk/Econet/BBCBSpEc.html
http://beebmaster.co.uk/Econet/SpEconet13.html
Pin 5 of the Econet module doesn't go to the outer pin of the din socket.
by IanS
Sun Jan 01, 2017 8:00 pm
Forum: hardware
Topic: Econet pinout
Replies: 9
Views: 669

Re: Econet pinout

I guess Acorn got in a mess with this and had already had socket boxes made which referred to pin 3 as clock+, even though the clock- signal is what actually gets to the ADLC chip. Or they just decided the positive pins looked better on the outer pins, maybe they thought it was easier to remember. T...
by IanS
Sat Dec 31, 2016 3:51 pm
Forum: general
Topic: Today I received.....
Replies: 4311
Views: 249981

Re: Today I received.....

Simple Econet socket box PCBs, daiy-chainable using RJ-45 network cables (should be "Phil Blundell" compatible) IMG_20161231_153858383.jpg I made it a bit too small, had to trim a bit off the 5-pin din sockets. IMG_20161231_153329777.jpg It can also have terminator components fitted on the...
by IanS
Thu Dec 29, 2016 11:47 am
Forum: other vintage computer hardware, software and games
Topic: Z80 I/O oddity on a PCW8256
Replies: 30
Views: 1169

Re: Z80 I/O oddity on a PCW8256

There are many ways of interfacing to the Z80, dpending on what you need to connect to. e.g. the CPS8256 Serial/Parallel I/F - http://www.z80.eu/pcw/cps8256circuit.gif has two methods. The Z80 DART is from the Z80 family, so just needs the /RD and /IORQ, and the /CE is decoded from the lower 8 bits ...
by IanS
Thu Dec 29, 2016 11:09 am
Forum: other vintage computer hardware, software and games
Topic: Z80 I/O oddity on a PCW8256
Replies: 30
Views: 1169

Re: Z80 I/O oddity on a PCW8256

jonb wrote:I wanted general suggestions...

I generally suggest you post the circuit, so we can see what you are talking about.

You also said you had to modify the trs-80 version , so it's no longer the same "known working" circuit.
by IanS
Wed Dec 28, 2016 7:28 pm
Forum: other vintage computer hardware, software and games
Topic: Z80 I/O oddity on a PCW8256
Replies: 30
Views: 1169

Re: Z80 I/O oddity on a PCW8256

So you want us to help debug a circuit we can't see from a vague description. I think most people will need a bit more than that to help. (You didn't get a lot of suggestions on the cpc forum, which is why I guess you are posting here)
by IanS
Wed Dec 28, 2016 6:14 pm
Forum: other vintage computer hardware, software and games
Topic: Z80 I/O oddity on a PCW8256
Replies: 30
Views: 1169

Re: Z80 I/O oddity on a PCW8256

Can you post pictures of the circuit you built (and possibly pictures of the actual build). Maybe someone can spot somthing wrong.
by IanS
Wed Dec 28, 2016 2:05 pm
Forum: hardware
Topic: Econet Bridge Circuit Diagram
Replies: 2
Views: 447

Re: Econet Bridge Circuit Diagram

I've updated the file in the first post, it should now be complete.
by IanS
Wed Dec 28, 2016 12:15 am
Forum: projects
Topic: Screenshot accessory for Arthur desktop
Replies: 4
Views: 612

Re: Screenshot accessory for Arthur desktop

Interesting, I'll give this a try when I next have my switchable OS machine out.
by IanS
Mon Dec 26, 2016 9:50 pm
Forum: hardware
Topic: Econet Bridge Circuit Diagram
Replies: 2
Views: 447

Econet Bridge Circuit Diagram

It's not complete, it needs checking and I need to update the component references for some of the passives. The chip numbers should be correct (IC? on the PCB have become U? in the PDF) Have I been wasting my time, does this already exist somewhere? I think this is now complete. Intere...
by IanS
Sat Dec 24, 2016 1:11 pm
Forum: hardware
Topic: Econet pinout
Replies: 9
Views: 669

Re: Econet pinout

Ultimately it comes down to how the hardware is configured. With an Acorn econet master module connected to an SJ Research clock the clock input to the ADLC matches the signal on pin 5 on the Din plug. I take this to be the Clock+ signal. The E01 Acorn Filestore (in-)famously got the clock signal th...
by IanS
Sat Dec 24, 2016 11:39 am
Forum: for sale / freebies
Topic: Offered: Matchbox sized 6502 / Z80 / 6809 Co Pro
Replies: 595
Views: 49696

Re: Offered: Matchbox sized 6502 / Z80 / 6809 Co Pro

Be nice if the T&C's weren't a placeholder ("Lorem ipsum dolor") http://www.xeropage.co.uk/shop/index.ph ... ent_only=1
by IanS
Fri Dec 23, 2016 1:44 pm
Forum: hardware
Topic: Super-simple Econet Clock design
Replies: 13
Views: 1299

Re: Super-simple Econet Clock design

After gathering some feedback on the original clock, I've now made a revised version which is a little more complex, but allows you to choose your clock configuration from a DIP switch (as well as some other nice additional features). The project write up is available here: http://www.waitingforfri...

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