Search found 341 matches

by myelin
Mon Apr 23, 2018 5:44 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 45
Views: 2087

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...
by myelin
Thu Apr 19, 2018 3:10 am
Forum: hardware
Topic: The Master List for New Retro Hardware
Replies: 87
Views: 8160

Re: The Master List for New Retro Hardware

Just sent you a pull request with some updates to the 'myelin' projects; hopefully this doesn't clash with your current updates!
by myelin
Tue Apr 17, 2018 11:44 pm
Forum: for sale / freebies
Topic: Free, via Twitter: Beeb stuff in Canterbury
Replies: 15
Views: 647

Re: Free, via Twitter: Beeb stuff in Canterbury

I would love to take one of the Masters, except I'm in the USA so I won't be able to come pick it up, I'm afraid :) If someone picks them all up and is prepared to ship internationally, please let me know!
by myelin
Tue Apr 17, 2018 8:47 pm
Forum: upcoming and recent events & exhibitions
Topic: Proposal: San Francisco Bay Area user group
Replies: 20
Views: 1789

Re: Proposal: San Francisco Bay Area user group

I'm excited for this, after seeing your photos :)

Let's go for the three tables then. I can bring a bunch of machines as long as they don't all have to be online at once, and I'm sure there might be overflow between us.
by myelin
Thu Apr 12, 2018 9:05 pm
Forum: hardware
Topic: A blitter for the beeb?
Replies: 57
Views: 3428

Re: A blitter for the beeb?

Nice work! It's really cool to see this project progressing... life has also gotten in the way for me and I haven't touched any of my projects for over a month. As such, no need to hurry getting boards to me; it's likely that it'd take me a while to get around to playing with it, and if I do find ti...
by myelin
Wed Apr 11, 2018 6:46 pm
Forum: upcoming and recent events & exhibitions
Topic: Proposal: San Francisco Bay Area user group
Replies: 20
Views: 1789

Re: Proposal: San Francisco Bay Area user group

I could probably fill up a whole table if I brought more than one machine... would need to dig up another screen from somewhere though. I feel like half a table (4' width) would probably be nicer though.

What are we aiming for here? One of each machine? Lots so people can play with them?
by myelin
Tue Apr 10, 2018 5:59 pm
Forum: hardware
Topic: External keyboard for an Acorn Electron.
Replies: 9
Views: 582

Re: External keyboard for an Acorn Electron.

The output is 8 data lines plus a RxRDY line. Reading the 8 data lines give you the ASCII keypress of whatever key is being pressed, eg &0D for RETURN, &81 for f1, &42 for B, &63 for c, etc. Ah, I see now. I'm looking at the Apple II Reference Manual (page 102), and it looks like th...
by myelin
Mon Apr 09, 2018 2:36 am
Forum: upcoming and recent events & exhibitions
Topic: Proposal: San Francisco Bay Area user group
Replies: 20
Views: 1789

Re: Proposal: San Francisco Bay Area user group

I'm (very slowly) putting together an Econet, although I don't have any original equipment so I'm doing it with my own designs (http://myelin.nz/acorn/ecohub etc). If I can get that working, we can swap in your original clock and give it a try!
by myelin
Sun Apr 08, 2018 1:57 am
Forum: hardware
Topic: Reverse Tube - an amusing idea
Replies: 8
Views: 407

Re: Reverse Tube - an amusing idea

crj wrote:The motivating example was to do most stuff on machine A, but have it use the filing systems from machine B so it can keep PAGE at &E00.

Ah, I see -- basically HostFS, except using the actual Tube protocol! (HostFS uses a modified version of the protocol so it can run over a serial port.)
by myelin
Wed Apr 04, 2018 7:21 pm
Forum: programming
Topic: Acorn files on other platforms
Replies: 38
Views: 1254

Re: Acorn files on other platforms

Glancing at mmb_utils, they seem to have a few limitations: ⋅ .INF files are the only way to get metadata into or out of the .ssd ⋅ The .INF format it uses seems slightly peculiar ("locked", "CRC=", 24-bit load/exec addresses) ⋅ Files on host OS dis...
by myelin
Tue Apr 03, 2018 10:39 pm
Forum: off-topic
Topic: My Wife
Replies: 39
Views: 1163

Re: My Wife

This is so sad... so sorry to hear. Best wishes, Ed.
by myelin
Tue Apr 03, 2018 5:52 pm
Forum: projects
Topic: Tube Elite with hardware outputs
Replies: 14
Views: 807

Re: Tube Elite with hardware outputs

Nice work!
by myelin
Tue Apr 03, 2018 5:08 pm
Forum: hardware
Topic: External keyboard for an Acorn Electron.
Replies: 9
Views: 582

Re: External keyboard for an Acorn Electron.

A useful ability/option would be pure ASCII output so it could be used as a keyboard for System, Atom, Apple, UK101, my Spectrum keyboard extension.... :) Again, there are various PS/2-to-ASCII convertors, but most of them give the wrong codes for, eg, cursors and function keys, and nothing for USB...
by myelin
Tue Apr 03, 2018 12:22 am
Forum: hardware
Topic: Cheap DIY Econet clock
Replies: 22
Views: 2673

Re: Cheap DIY Econet clock

lcww1, that's a really nice looking board! I designed a related board a while ago if anyone is interested in an Econet 'hub' as well as a clock generator: http://myelin.nz/acorn/ecohub It uses a micro USB socket for power input, and has the Econet biasing circuit as well as an ATTINY85 to generate t...
by myelin
Mon Apr 02, 2018 6:39 pm
Forum: programming
Topic: Acorn files on other platforms
Replies: 38
Views: 1254

Re: Acorn files on other platforms

My guess is that SQLite, despite being fairly lightweight, still feels like a fairly big hammer for the seemingly-small problem of associating metadata with files. It's a great tool, but it's not something everyone is familiar with. Devil's advocate here: crj, is the current approach of file + file....
by myelin
Mon Apr 02, 2018 4:07 am
Forum: hardware
Topic: Arduino Filestore - Code now available to download
Replies: 9
Views: 477

Re: Arduino Filestore - Code now available to download

Thank you! Very excited to try this out :)
by myelin
Fri Mar 30, 2018 11:50 pm
Forum: programming
Topic: Acorn files on other platforms
Replies: 38
Views: 1254

Re: Acorn files on other platforms

Feels like the sort of thing that could be awesome, but also could result in a " there are 15 competing standards " situation :) Are you thinking of this as an exchange format? Something for embedded systems to understand? How stable is the SQLite/SQLAR format? Is there a risk that a new v...
by myelin
Sun Mar 25, 2018 10:13 pm
Forum: hardware
Topic: External keyboard for an Acorn Electron.
Replies: 9
Views: 582

Re: External keyboard for an Acorn Electron.

In 2009, Prime made boards to allow connecting PS/2 keyboards to the Beeb, Master, and Electron. More recently, I've done it for a BBC Master using a microcontroller and a CPLD , and have a PCB design in progress that'll support the Model B as well and allow connecting a USB keyboard. The Electron ...
by myelin
Wed Mar 21, 2018 6:54 pm
Forum: hardware
Topic: HostFS and microcontrollers?
Replies: 48
Views: 2514

Re: HostFS and microcontrollers?

For the record, since I got my ATMEGA32U4-based serial adapter to actually use the correct baud rate, I haven't seen any errors when communicating using any of the *commands in MartinB's UPURS ROM, only with Stephen's UPURSFS (HostFS:UPURS). When I get some time, I'll hook up my Saleae analyzer to t...
by myelin
Tue Mar 20, 2018 11:28 pm
Forum: archive issues
Topic: Electron to BBC Conversions
Replies: 42
Views: 2736

Re: Electron to BBC Conversions

Yep, the Electron never accesses RAM (or &FCxx/FDxx, and maybe &FExx) faster than 1MHz.
by myelin
Tue Mar 20, 2018 10:55 pm
Forum: hardware
Topic: HostFS and microcontrollers?
Replies: 48
Views: 2514

Re: HostFS and microcontrollers?

Maybe something to try to sidestep turnaround delays? I'd be very interested to see your scope traces that show why things are breaking with a non-FTDI adapter! I assume something to do with RTS timing, or non-FTDI adapters sampling CTS at the wrong time? The big issue I had with my adapter (first p...
by myelin
Tue Mar 20, 2018 9:32 pm
Forum: hardware
Topic: HostFS and microcontrollers?
Replies: 48
Views: 2514

Re: HostFS and microcontrollers?

Some possibly-off-topic digging I just did in the internals of the Arduino WiFi101 library: It looks like the WINC1500 chip handles things from the sockets layer on down. Here's the socket driver from WiFi101: https://github.com/arduino-libraries/WiFi101/blob/master/src/socket/source/socket.c Note t...
by myelin
Tue Mar 20, 2018 9:17 pm
Forum: hardware
Topic: HostFS and microcontrollers?
Replies: 48
Views: 2514

Re: HostFS and microcontrollers?

Not sure how much work the host MCU has to do, and how much is performed by the CPU inside the WINC1500 module, but the code uses the WiFi101 Arduino library, and the .ssd URL is hardcoded into the source.
by myelin
Tue Mar 20, 2018 7:12 pm
Forum: hardware
Topic: HostFS and microcontrollers?
Replies: 48
Views: 2514

Re: HostFS and microcontrollers?

Thank you!
by myelin
Tue Mar 20, 2018 6:41 pm
Forum: hardware
Topic: HostFS and microcontrollers?
Replies: 48
Views: 2514

Re: HostFS and microcontrollers?

Nitpicky request... can you put a license on your github repo? I'd love to mess with and hopefully help with this code, but corporate rules dictate that it have a recognizable/standard open source license (Apache 2.0 matches my project's license, but GPL, MIT, BSD are all also fine -- anything compa...
by myelin
Tue Mar 20, 2018 7:33 am
Forum: hardware
Topic: HostFS and microcontrollers?
Replies: 48
Views: 2514

Re: HostFS and microcontrollers?

.ssd access via wifi, with an off-the-shelf Arduino board plus a level shifter, and the UPURS version of HostFS.

Now *that* is pretty amazing :)
by myelin
Sun Mar 18, 2018 9:26 pm
Forum: hardware
Topic: bbc-fdc from Jasper Renow-Clarke
Replies: 5
Views: 531

Re: bbc-fdc from Jasper Renow-Clarke

I finally wired mine up and have it running with a 3.5" drive from a ~2005-era PC. 2018-03-bbc-fdc-in-action-sm.JPG POWER I'm powering this using a string of adapters connected to the power output for a USB3 hard drive adapter. Works well, and meant I didn't need to cut up any cables, which was...
by myelin
Fri Mar 16, 2018 7:04 pm
Forum: hardware
Topic: I've wondered this for thirty years...
Replies: 19
Views: 866

Re: I've wondered this for thirty years...

Someone in marketing thought it sounded cool?

Maybe they wanted to emphasize that it was compatible with the Model B...
by myelin
Fri Mar 16, 2018 7:03 pm
Forum: hardware
Topic: Myelin's in-system updateable MegaROM for the BBC Master 128
Replies: 31
Views: 1406

Re: Myelin's in-system updateable MegaROM for the BBC Master 128

Isn't this what the 6502 RDY pin is for? Pull RDY to halt the 6502 and free the data bus (only works on CMOS 6502s as far as I know, as NMOS ones can't be stopped for very long). That would work nicely if this was running as an Electron cartridge! I'm trying to pull this off with just the signals I...
by myelin
Fri Mar 16, 2018 6:41 pm
Forum: hardware
Topic: Myelin's in-system updateable MegaROM for the BBC Master 128
Replies: 31
Views: 1406

Re: Myelin's in-system updateable MegaROM for the BBC Master 128

How about loading a branch instruction into the VIAs registers and jumping to it? Excellent idea, although I don't believe this would tristate the data bus... it would keep the processor away from any actual memory, but would still result in a read on every clock cycle. crj's suggestion to add in a...