Search found 723 matches

by myelin
Tue Sep 17, 2019 4:59 pm
Forum: development tools
Topic: Deploy-and-run from PC to Beeb?
Replies: 44
Views: 2301

Re: Deploy-and-run from PC to Beeb?

Looking at my TubeHost code, I changed that line to:

system("stty -f $socket_path $BAUD crtscts ignbrk ignpar -icrnl -ixon -opost -isig -icanon -iexten -echo");

I think this made it work on macOS; I don't seem to have any other interesting modifications.
by myelin
Sat Sep 14, 2019 3:37 pm
Forum: hardware
Topic: "Arcflash" A3000/A3xx/A4xx/A5xx/A5000 in-system programmable ROM -- any interest?
Replies: 122
Views: 6546

Re: "Arcflash" A3000/A3xx/A4xx/A5xx/A5000 in-system programmable ROM -- any interest?

Reset and POR both work! Verified in my A310 at least. Now I can double tap on reset to jump back to the bootloader, and selecting an OS triggers a power on reset too, so you can clear the NVRAM (necessary when switching between OS versions with incompatible NVRAM layouts). This is all pushed to Git...
by myelin
Fri Sep 13, 2019 10:08 pm
Forum: hardware
Topic: MEMC1A timeline and documentation
Replies: 9
Views: 793

Re: MEMC1A timeline and documentation

Nice sleuthing! This is really interesting; I'm hoping to eventually design an FPGA MEMC replacement, to allow all socketed MEMC boards to be upgraded to 16MB, and it would be nice to give it the ability to replicate original timings (plus all the expected stuff: configurable clock output, doing all...
by myelin
Fri Sep 13, 2019 5:21 pm
Forum: wanted
Topic: Wanted: Elite with manuals and function key strip
Replies: 0
Views: 96

Wanted: Elite with manuals and function key strip

Everybody at our exhibit at VCF West this year wanted to play Elite, but none of us knew the keys off the top of our heads, so I'm looking for a copy of the game; any version will do (although preferably not the Electron version as I know there's a copy in my parents' attic) as long as it has the ma...
by myelin
Wed Sep 11, 2019 1:44 pm
Forum: hardware
Topic: Proposed: "The Ultimate Electron Upgrade"
Replies: 450
Views: 30210

Re: Proposed: "The Ultimate Electron Upgrade"

You should fly to a UK Acorn event, you would probably be mob by adoring fans. Hehe... thanks for the vote of confidence :) The experience left me feeling a little burnt out on the UEU project, but I need to remember that I'm doing this is to make an amazing upgrade for the first computer I had as ...
by myelin
Tue Sep 10, 2019 8:41 pm
Forum: hardware
Topic: SD to IDE adapter on RiscPC?
Replies: 5
Views: 159

Re: SD to IDE adapter on RiscPC?

Thanks for the correction! I added the diode because my network adapter stopped working, but I also have a CD-ROM drive on the same cable, so it was probably necessary for that too. I haven't run into the Disc Error 20 issue, but I also don't use that machine that much, so I can't say if I was lucky...
by myelin
Tue Sep 10, 2019 8:25 pm
Forum: hardware
Topic: SD to IDE adapter on RiscPC?
Replies: 5
Views: 159

Re: SD to IDE adapter on RiscPC?

You can get it to work without patching ADFS if you use a stack of several adapters -- I have a working one made from an IDE-to-CF adapter with a track scratched out and replaced with a diode, an SD to CF adapter, a micro SD to SD adapter, and a micro SD card. Details here: https://stardot.org.uk/fo...
by myelin
Tue Sep 10, 2019 12:32 am
Forum: hardware
Topic: Proposed: "The Ultimate Electron Upgrade"
Replies: 450
Views: 30210

Re: Proposed: "The Ultimate Electron Upgrade"

VCF West was fun as always. The UEU didn't really impress anyone ("oh ok, so you designed a board and put an FPGA in there. cool.") but that was kind of what I expected... Californians don't usually tend to know much about the Acorn machines. Next time I need to write up a bit more Acorn history -- ...
by myelin
Mon Sep 09, 2019 9:55 pm
Forum: hardware
Topic: "Arcflash" A3000/A3xx/A4xx/A5xx/A5000 in-system programmable ROM -- any interest?
Replies: 122
Views: 6546

Re: "Arcflash" A3000/A3xx/A4xx/A5xx/A5000 in-system programmable ROM -- any interest?

Yes; Arcflash is designed so that /OE and the four high order address lines can be jumpered differently or attached to flying leads, so it's pretty flexible. I believe an A310 with a carrier board will look like an A3000 with its jumpers set up for 4Mbit JEDEC ROMs, so you would just set the jumpers...
by myelin
Mon Sep 09, 2019 3:51 pm
Forum: hardware
Topic: Cheap Xilinx LX9 Starter Board
Replies: 30
Views: 4047

Re: Cheap Xilinx LX9 Starter Board

You could omit the 1.5K pullup resistors, but then the level shifter would only drive to a maximum of about 3.2V. This might not be high enough for some CMOS devices. Note that a lot of 80s/90s era CMOS devices still use TTL levels on their inputs, and all the Acorn machines I've looked at are like...
by myelin
Sat Sep 07, 2019 8:31 pm
Forum: hardware
Topic: "Arcflash" A3000/A3xx/A4xx/A5xx/A5000 in-system programmable ROM -- any interest?
Replies: 122
Views: 6546

Re: "Arcflash" A3000/A3xx/A4xx/A5xx/A5000 in-system programmable ROM -- any interest?

The first of the Arcflash v2 boards is now working :) It took a while to debug because I incorrectly assumed that the A310 grounded pin 24 of the roms like an A3000 configured for JEDEC chips, but of course it doesn’t; it’s hardwired for 1Mbit roms. After adding the correct jumper it all came to lif...
by myelin
Fri Sep 06, 2019 8:32 pm
Forum: other vintage computer hardware, software and games
Topic: 27C400/800/160/320 emulator/ROM switcher
Replies: 17
Views: 479

Re: 27C400/800/160/320 emulator/ROM switcher

Nice work... that is one densely routed board! My attempt at something similar a while back was about twice the width. I take it that that's a USB micro next to C10?
by myelin
Fri Sep 06, 2019 5:23 pm
Forum: hardware
Topic: Open source A5000 RAM
Replies: 9
Views: 377

Re: Open source A5000 RAM

Zoom in on the photo of the back of the board above... the buffers go on those 14 SOT-23-5 footprints (which have solder blobs bridging the input and output right now). Plus one for Ra9 on the front of the board, by the looks of things.
by myelin
Thu Sep 05, 2019 4:51 pm
Forum: general
Topic: Awesome collection of 70's & 80's tech docs and data sheets
Replies: 21
Views: 440

Re: Awesome collection of 70's & 80's tech docs and data sheets

More on the people involved here --

@jason_scott is Jason Scott of textfiles.org and the Archive Team -- https://twitter.com/textfiles

bitsavers.org is Al Kossow of the Computer History Museum -- https://www.computerhistory.org/staff/al-kossow/
by myelin
Tue Aug 27, 2019 7:02 pm
Forum: hardware
Topic: Electron joystick
Replies: 3
Views: 145

Re: Electron joystick

I was messing with this a few weeks back to make games work on the FPGA ULA ("Ultimate Electron Upgrade"). There are two relevant registers on the Plus 1. Here are my notes in code: -- Plus 1 status register: -- D4 = joystick fire button 0 -- D5 = joystick fire button 1 -- D6 = analog interrupt -- D...
by myelin
Fri Aug 23, 2019 5:50 am
Forum: hardware
Topic: Femto Flash Floppy
Replies: 28
Views: 1025

Re: Femto Flash Floppy

=D> Clever! Might work well internally on an Arc too.
by myelin
Fri Aug 16, 2019 12:47 am
Forum: hardware
Topic: Latest project ...
Replies: 10
Views: 603

Re: Latest project ...

Nice!

I had no idea there was such a thing as a microcontroller with USB Host capability in a DIP package :)
by myelin
Tue Aug 13, 2019 4:33 am
Forum: hardware
Topic: "Arcflash" A3000/A3xx/A4xx/A5xx/A5000 in-system programmable ROM -- any interest?
Replies: 122
Views: 6546

Re: "Arcflash" A3000/A3xx/A4xx/A5xx/A5000 in-system programmable ROM -- any interest?

Well... just goes to show that you can't trust any of my estimates :lol:

I just soldered up the first three Arcflash v2 boards and am in the process of programming and testing them.
by myelin
Tue Aug 06, 2019 11:20 pm
Forum: projects
Topic: BCP: a BBC Micro printed circuit design program
Replies: 19
Views: 775

Re: BCP: a BBC Micro printed circuit design program

Sounds excellent! Do post in-progress screenshots; I'm really looking forward to seeing this :)
by myelin
Fri Aug 02, 2019 10:05 pm
Forum: projects
Topic: BeebLink
Replies: 52
Views: 3279

Re: BeebLink

Chris's FT232 adapter board + PAL arrived just in time for me to build and fit it to my Master 128 before VCF West starts tomorrow -- so I'll have the Electron and Master 128 side by side at the Computer History Museum this weekend, running the two different versions :) As expected, the Tube adapter...
by myelin
Fri Aug 02, 2019 2:33 pm
Forum: hardware
Topic: Proposed: "The Ultimate Electron Upgrade"
Replies: 450
Views: 30210

Re: Proposed: "The Ultimate Electron Upgrade"

And Mega Games Cartridge emulation works... I dumped the 256 16k pages from my MGC and uploaded them into the UEU's flash, and now I have an internal MGC :) Focussing right now on making the machine look good for VCF West; for anyone reading this in the SF Bay Area, Steve Crozier, Anthony Curtis (at...
by myelin
Wed Jul 31, 2019 6:15 pm
Forum: hardware
Topic: Purchased a RiscPC from ebay and need help on how to get it working
Replies: 14
Views: 504

Re: Purchased a RiscPC from ebay and need help on how to get it working

^ what he said -- get that battery out asap! That's a nice machine! Doesn't look like the battery has done too much damage to the board; the battery itself looks awful, but I don't see any green around it. The Risc PC boot process requires a working hard disk, so it's normal for it to fail like this...
by myelin
Tue Jul 30, 2019 2:58 am
Forum: hardware
Topic: Proposed: "The Ultimate Electron Upgrade"
Replies: 450
Views: 30210

Re: Proposed: "The Ultimate Electron Upgrade"

I have gradually lost track, and back tracking through the thread is getting hard. I've lost track a bit myself :) I'll update the README at https://github.com/myelin/ElectronFpga at some point to give a better idea of what's going on! In other news, we now have a USB PID for the debug/serial/BeebL...
by myelin
Mon Jul 29, 2019 11:11 pm
Forum: software: other
Topic: MMFS Version 2
Replies: 13
Views: 592

Re: MMFS Version 2

Excellent!
by myelin
Sat Jul 27, 2019 2:43 pm
Forum: hardware
Topic: Building a monster A3000
Replies: 16
Views: 635

Re: Building a monster A3000

=D> Looking forward to reading the full story! Glad I could help out with the ROM spacing adapter!
by myelin
Fri Jul 26, 2019 11:44 pm
Forum: hardware
Topic: Proposed: "The Ultimate Electron Upgrade"
Replies: 450
Views: 30210

Re: Proposed: "The Ultimate Electron Upgrade"

Bit of a delay since the last update here because I've been posting over in the BeebLink thread while trying to get that working. After much coding and debugging, as of this morning it seems to be running reliably -- at least for the 2.5 minutes it takes to run the test suite :D The next to-do item ...
by myelin
Fri Jul 26, 2019 1:48 pm
Forum: projects
Topic: BeebLink
Replies: 52
Views: 3279

Re: BeebLink

Just had my first successful run through the FS-TEST program :) "GOOD. TOOK 147.52 SECOND(S)." I ported my program over to run under ASF4 / Atmel START, and after a ton of debugging work trying to understand what was going on with the USB CDC implementation, it now runs. Took ages, but now I'm a bit...
by myelin
Sun Jul 21, 2019 1:52 pm
Forum: projects
Topic: BeebLink
Replies: 52
Views: 3279

Re: BeebLink

I haven't looked through the decoded USB capture yet, but I have managed to reproduce the FF problem on Linux, which means I can use Wireshark to capture the USB packets at the OS level and see what's going on there. Expect more here in a bit once I figure out how to configure that :) BTW it looks l...
by myelin
Sun Jul 21, 2019 2:58 am
Forum: projects
Topic: BeebLink
Replies: 52
Views: 3279

Re: BeebLink

I did see the notes page! Very helpful to understand the sync process and why it exists. It took me a little while to correctly implement that, mainly because I started with avr.s65 rather than tube_serial.s65, so I ended up with some outdated stuff. Then most of the errors were due me using the A r...