Search found 430 matches

by myelin
Fri May 18, 2018 4:31 pm
Forum: hardware
Topic: Cartridge slots
Replies: 8
Views: 513

Re: Cartridge slots

The cartridge slot interface is a little easier to work with, for most things you'd want to do. It provides the /INFC and /INFD signals that go low when the machine is accessing &FCxx and &FDxx, and a /ROMOE signal that goes low when the machine is accessing the ROM in each individual cartridge. The...
by myelin
Thu May 17, 2018 8:35 pm
Forum: emulators
Topic: Mac Arculator
Replies: 31
Views: 2098

Re: Mac Arculator

How did this go? I'm poking at porting it to Allegro 5 at the moment, working with Sarah's official sources (https://bitbucket.org/pcem_emulator/arculator), which I assume are the most up to date. I'm not touching any of the GUI side of things, just trying to get the basics working. Looks like quite...
by myelin
Wed May 16, 2018 7:54 am
Forum: hardware
Topic: Cheap web-modem for the beeb/master (and arc if ya like!)
Replies: 106
Views: 3749

Re: Cheap web-modem for the beeb/master (and arc if ya like!)

Look at JGH’s original HostFS source for examples of how to use CTS and RTS on the Beeb’s serial port (the hardware one, as opposed to UPURS).

On the Arduino side, I wouldn’t be surprised if it’s subtly different depending on the MCU!
by myelin
Mon May 14, 2018 7:47 am
Forum: hardware
Topic: Restoring an A3000 with lots of battery damage
Replies: 8
Views: 610

Re: Restoring an A3000 with lots of battery damage

Sometimes it's the dumbest things... I scoped up the ROMs and found that they were never getting enabled (pin 24 stuck high). RAS was strobing (refreshing), CAS0-3 were inactive, and A[21:17] (which I got from IC30 and IC31) were cycling at a rate which looked like the machine was just running throu...
by myelin
Sat May 12, 2018 9:51 pm
Forum: hardware
Topic: Restoring an A3000 with lots of battery damage
Replies: 8
Views: 610

Re: Restoring an A3000 with lots of battery damage

Had time for a quick test... scoping up RAS and CAS0-3 shows that RAS is strobing regularly (memory refresh) but there's only a small amount of CAS activity at first, then nothing (all lines high). Looks like MEMC is alive, but either the ROMs are dead or the ARM2 is unhappy. It's all packed away no...
by myelin
Sat May 12, 2018 6:55 pm
Forum: hardware
Topic: Master 128 keyboard restoration
Replies: 3
Views: 231

Re: Master 128 keyboard restoration

Update: I put all the keycaps back on this morning, and the force required to hit each key seems to be much more even now. Haven't powered it up to test whether they all work well now, but it definitely feels a lot nicer. I'll try out the desolder / unscrew / scrape technique on any keys that are st...
by myelin
Sat May 12, 2018 6:22 pm
Forum: hardware
Topic: Restoring an A3000 with lots of battery damage
Replies: 8
Views: 610

Re: Restoring an A3000 with lots of battery damage

That looks like glue. Used to try to improve the mechanical stability of large components (like electrolytic capacitors, inductors, etc.) and where wires are soldered directly to the board. Stick a flat bladed screwdriver (or similar) into it and see if it is 'rubbery'. Good point... It doesn't loo...
by myelin
Sat May 12, 2018 7:38 am
Forum: hardware
Topic: myelin’s Econet Hub
Replies: 22
Views: 1055

Re: myelin’s Econet Hub

I'm assuming that the ATTiny is still running my Econet clock firmware? It's been really cool to watch this evolve from my "I need a Econet clock!" moment , all the way to an all-singing, all-dancing Econet solution. Nice work chaps :) Yep! It's running your code, with a small modification ( here's...
by myelin
Sat May 12, 2018 2:30 am
Forum: hardware
Topic: Master 128 keyboard restoration
Replies: 3
Views: 231

Master 128 keyboard restoration

I have a Master 128 keyboard (the mechanical type, i.e. http://8bs.com/submit/subkeyboard.htm#master128) which started out with a few non-working keys (9 and 0 in the row below the function keys, and 0 in the numpad). I tried bashing each of them a bunch of times, and they eventually came to life. S...
by myelin
Fri May 11, 2018 11:32 pm
Forum: hardware
Topic: Restoring an A3000 with lots of battery damage
Replies: 8
Views: 610

Restoring an A3000 with lots of battery damage

I just took possession of my first A3000 :) Used to have an A4000 back in the 90s (I still have the hard disk image with all my high school projects and programming work) so it's exciting to have access to an Archimedes machine again! Externally, needs a bit of cleaning... 2018-05-11 01 a3000 sm.jpg...
by myelin
Fri May 11, 2018 9:03 pm
Forum: hardware
Topic: myelin’s Econet Hub
Replies: 22
Views: 1055

Re: myelin’s Econet Hub

I've just packed up two for Liam, two for Mark, and one for ask_nz (who still needs to send me an address). There are only two PCBs left now, so anyone else who wants one should get in quick :) (I'll do another board order in a bit, but if you want one now, PM me...)
by myelin
Fri May 11, 2018 8:58 pm
Forum: hardware
Topic: Cheap web-modem for the beeb/master (and arc if ya like!)
Replies: 106
Views: 3749

Re: Cheap web-modem for the beeb/master (and arc if ya like!)

Nice work! Using it to access Teletext is really clever... an internet service that's actually designed for these machines :)
by myelin
Fri May 11, 2018 8:31 am
Forum: hardware
Topic: myelin’s Econet Hub
Replies: 22
Views: 1055

Re: myelin’s Econet Hub

I’ll absolutely post to NZ :) PM me your address (Mark, can you do that too?) and I’ll drop one in the mail for you!
by myelin
Tue May 08, 2018 10:28 pm
Forum: hardware
Topic: Simultaneous internet & mass storage solutions for the A3010
Replies: 27
Views: 1087

Re: Simultaneous internet & mass storage solutions for the A3010

This was an idea I threw out a while back, not sure if the thread is helpful here; :) http://www.stardot.org.uk/forums/viewtopic.php?f=16&t=10590&p=129863&hilit=vinculum#p129863 Thanks! Some very useful history in that thread. This also sounds like a lovely idea! And I wonder if an Econet solution ...
by myelin
Tue May 08, 2018 5:24 pm
Forum: hardware
Topic: Simultaneous internet & mass storage solutions for the A3010
Replies: 27
Views: 1087

Re: Simultaneous internet & mass storage solutions for the A3010

This makes me wonder how much work it would be to design a mini podule that takes a Raspberry Pi (Zero W or 3B/3B+) and a flash chip, and implements mass storage and networking all through the Pi...
by myelin
Tue May 08, 2018 2:06 am
Forum: hardware
Topic: Torch Z80 cable
Replies: 5
Views: 320

Re: Torch Z80 cable

If it connects to the Tube socket, it's probably close but not quite the same as a standard IDE cable. If you have an old 40-conductor IDE cable, that might work, but the new 80-conductor ones definitely won't. I've found a good trick for finding compatible Tube cables is to search for Raspberry Pi ...
by myelin
Mon May 07, 2018 4:39 pm
Forum: hardware
Topic: myelin’s Econet Hub
Replies: 22
Views: 1055

Re: myelin’s Econet Hub

I'd be interested in buying a new board :mrgreen: I’d like to build a couple of these hubs, and add some casing to provide protection and longevity I believe I have 7 more PCBs, and I doubt I'll want to make more of them for myself, because I have less than 5 Econet capable machines, so if either o...
by myelin
Mon May 07, 2018 12:07 am
Forum: hardware
Topic: myelin’s Econet Hub
Replies: 22
Views: 1055

Re: myelin’s Econet Hub

Shame you let the magic smoke out. Has to be said, I'm not a fan of all the small form factor USB connectors :( Give me the 2.1mm/5.5mm power connectors any day. I feel that micro USB is becoming the new standard for powering stuff at 5V thanks to ubiquitous USB power supplies, but I can see if I c...
by myelin
Sun May 06, 2018 7:51 pm
Forum: hardware
Topic: myelin’s Econet Hub
Replies: 22
Views: 1055

Re: myelin’s Econet Hub

Nice work! This is the first successful econet setup using my hub design, as I haven’t gotten my own one working yet :)

That module podule (which I thought had to be a typo at first, before taking a look and finally understanding the joke :) ) looks very nice also.
by myelin
Sat May 05, 2018 11:24 pm
Forum: for sale / freebies
Topic: IDE podules - 8 and 16 bit versions
Replies: 43
Views: 2440

Re: IDE podules - 8 and 16 bit versions

Is this an open source design or something with shareable gerbers so other interested folks can do a batch? I have an A3000 on the way and some in-progress HW designs, so I'd be interested in adding a set of the 8-bit mini-podule boards to my next Seeed order and sharing spares with others on this s...
by myelin
Sat May 05, 2018 4:51 pm
Forum: hardware
Topic: Myelin's FX2 Tube/Cartridge Adapter - Development and Support
Replies: 46
Views: 2371

Re: Myelin's FX2 Tube/Cartridge Adapter - Development and Support

PM me and I’ll check on Monday :) I might be all out but want to do a PCB order soon anyway.
by myelin
Fri May 04, 2018 8:06 pm
Forum: software
Topic: Filesystem interchangeability?
Replies: 4
Views: 466

Re: Filesystem interchangeability?

Ahhh, this is all making sense now. Thanks for all the details! It looks like the boot drive/fs is configured with *CONFIGURE FILESYSTEM, *CONFIGURE DRIVE, and *CONFIGURE BOOT. Then as long as I have a filesystem module installed by the time the Wimp starts, I can just respond to Service_StartFiler ...
by myelin
Thu May 03, 2018 11:35 pm
Forum: software
Topic: Filesystem interchangeability?
Replies: 4
Views: 466

Re: Filesystem interchangeability?

Thanks for the quick response! What I'm trying to get my head around is how the machine boots up, and what causes it to make disks visible in the icon bar. Does the WIMP run !Boot on all attached disks on startup, or is there some other boot configuration that happens somewhere? I'm hoping someone w...
by myelin
Thu May 03, 2018 10:06 pm
Forum: software
Topic: Filesystem interchangeability?
Replies: 4
Views: 466

Filesystem interchangeability?

I just acquired an A3000; while it winds its way across the pond to San Francisco, I'm figuring out what I need to do to get it into a useful state. One obvious thing seems to be to get some sort of internal storage. One impression I've gotten from reading around is that there's no "required" hard d...
by myelin
Thu May 03, 2018 4:33 pm
Forum: software & utilities for the pc, mac or unix
Topic: Docker & Acorn 101
Replies: 17
Views: 913

Re: Docker & Acorn 101

A few months back I read a blog post where someone ran a Xilinx build on a filesystem that tracked all accesses, then redid it with just the files that it touched, and it was more like ~150MB. I can't find it any more, unfortunately!
by myelin
Wed May 02, 2018 11:38 pm
Forum: software & utilities for the pc, mac or unix
Topic: Docker & Acorn 101
Replies: 17
Views: 913

Re: Docker & Acorn 101

Assume gCloud is equiv of Docker-compose. I use those to start Jenkins container. Must remember to push that to my Jenkins-Docker fork. Looks like docker compose is something to start up a bunch of services... gcloud is Google's tool that you use for pretty much all interaction with services like C...
by myelin
Wed May 02, 2018 9:20 pm
Forum: software & utilities for the pc, mac or unix
Topic: Docker & Acorn 101
Replies: 17
Views: 913

Re: Docker & Acorn 101

Ah, Jenkins + Docker Hub, that's right. At work of course it's G-everything, so we use gcr.io :) Docker Hub being free for public projects is awesome; it makes it the obvious place to store your images if you don't have other reasons to keep them inside the Google Cloud. I haven't looked at making a...
by myelin
Wed May 02, 2018 5:17 pm
Forum: software & utilities for the pc, mac or unix
Topic: Docker & Acorn 101
Replies: 17
Views: 913

Re: Docker & Acorn 101

Very nice! Something I've been playing with recently is using Google Cloud Container Builder to build projects. It's designed for building Docker images (we use it at work to build untrusted code), but all it does is execute Docker containers in sequence, so you can do all sorts of not-really-relate...
by myelin
Thu Apr 26, 2018 8:18 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 279
Views: 10516

Re: RGB to HDMI using a Pi Zero and a small CPLD

I'll have a look at this tonight. From what I can see, it should be possible to simplify it a bit by removing the 3.3V regulator (seeing as the Pi will power the 3V3 rail) and moving the JTAG header out of the way of the signals that go to the Pi. I'll report back once I've had a go at it! So that ...
by myelin
Mon Apr 23, 2018 5:44 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 279
Views: 10516

Re: RGB to HDMI using a Pi Zero and a small CPLD

Is there any update on the production of the pcb or making the design available ? I overpromised a bit there :) Came down with shingles in January, and that derailed my retro hardware efforts for a while. Hoglet put up his current designs here ; if you're feeling adventurous, I think the V2 PCB wou...