Search found 241 matches

by SteveBagley
Sat Apr 04, 2020 9:57 am
Forum: upcoming and recent events & exhibitions
Topic: Second 'Virtual ABug', Saturday 11th April, 9am - 5pm
Replies: 29
Views: 431

Re: First 'Virtual ABug', Saturday 11th April, 9am - 5pm

I'd had similar thoughts and knew we'd end up discussing this pretty quickly. I think what may happen is other meetings will be started to drill down into each category. Whether markjw can do this or others have use their free accounts to host smaller meetings shouldn't be such a problem as long as...
by SteveBagley
Fri Apr 03, 2020 1:32 pm
Forum: general
Topic: Wikipedia articles on Econet and DFS [citation needed]
Replies: 12
Views: 536

Re: Wikipedia articles on Econet and DFS [citation needed]

Looking at the Wikipedia edit history, it looks like those comments were added by the user Rob Napier in 2013. Chris Dawkins' Econet book (scans in the other thread) mentions a Rob Napier at Barson Computers and, of course, there was a book about Econet written by Rob Napier. I wonder if there's a w...
by SteveBagley
Thu Apr 02, 2020 10:24 pm
Forum: emulators
Topic: BeebEm Mac - Info
Replies: 120
Views: 7383

Re: BeebEm Mac - Info

camsoft2000 wrote:
Thu Apr 02, 2020 4:31 pm
I guess it will need porting to Apple's Metal framework to future proof it for years to come.
Yea — although I doubt OpenGL will disappear for a long while…

Steve
by SteveBagley
Thu Apr 02, 2020 4:27 pm
Forum: emulators
Topic: BeebEm Mac - Info
Replies: 120
Views: 7383

Re: BeebEm Mac - Info

camsoft2000 wrote:
Thu Apr 02, 2020 4:23 pm
And it works in Catalina, nice work Steve. Will be really helpful as I'm less familiar with emulators myself but pretty competent with Cocoa and AppKit.
Yea -- I was trying to keep it clean (at least until Apple deprecated OpenGL).

Steve
by SteveBagley
Thu Apr 02, 2020 4:12 pm
Forum: emulators
Topic: BeebEm Mac - Info
Replies: 120
Views: 7383

Re: BeebEm Mac - Info

I'd be very interested in seeing a copy of that, Steve! :idea: The compiled app (unsigned -- you'll need to right-click and select open to force macOS to run it) is jhere . With the Xcode project, here . Please bear in mind this was a hack I put together and not intended for release but people migh...
by SteveBagley
Thu Apr 02, 2020 3:39 pm
Forum: emulators
Topic: BeebEm Mac - Info
Replies: 120
Views: 7383

Re: BeebEm Mac - Info

About five years ago, I hacked around with the windows BeebEm source code to compile a version that runs purely in Cocoa and doesn’t rely on any non-native libraries (video is via OpenGL, audio via OpenAL — well they were native then). The downside is I was rather liberal in editing the BeebEm sourc...
by SteveBagley
Wed Apr 01, 2020 10:25 am
Forum: archive requests
Topic: Econet Micro Guide by Christopher Dawkins
Replies: 18
Views: 3534

Re: Econet Micro Guide by Christopher Dawkins

This brings back some fond memories of borrowing this from the local library in the 1990s… Some interesting comments in there though, specifically about Econet being ported to other machines in Appendix 1: Econet hardware has been implemented for the Apple II, the Nascoms 1 and 2, the Research Machi...
by SteveBagley
Thu Mar 19, 2020 10:36 pm
Forum: off-topic
Topic: Isolating myself - for three months !!!!!!!!!!!
Replies: 33
Views: 1411

Re: Isolating myself - for three months !!!!!!!!!!!

danielj wrote:
Thu Mar 19, 2020 9:39 pm
We're basically on lockdown here. The University has moved everyone to home working. Zoom is my new friend.
Same here — although did have time to nip into my office and grab some of my retro machines (no Acorns though, all Atari) :). We are MS Teams based here though.

Steve
by SteveBagley
Fri Mar 13, 2020 7:38 pm
Forum: hardware
Topic: Electron Screen Mode at startup
Replies: 5
Views: 214

Re: Electron Screen Mode at startup

jms2 wrote:
Fri Mar 13, 2020 7:30 pm
No it doesn't. It's hard wired to Mode 6.
Presumably in the ROM chip?

Steve
by SteveBagley
Fri Mar 13, 2020 6:59 pm
Forum: hardware
Topic: Electron Screen Mode at startup
Replies: 5
Views: 214

Electron Screen Mode at startup

Does the Acorn Electron have a mechanism to specify what screen mode it starts up in (similar to the DIP switches on the BBC Model B's keyboard)? The reason I ask is that I have a student who is developing an Electron emulator for his final year dissertation and we were trying to track down this aft...
by SteveBagley
Wed Mar 04, 2020 3:43 pm
Forum: hardware
Topic: [Fixed!] Completely new to BBC hardware - Master with flashing cursor, no boot
Replies: 37
Views: 754

Re: Completely new to BBC hardware - Master with flashing cursor, no boot

Turn it on while holding down the 'R' key to reset the CMOS configuration -- that should (hopefully) bring it up in a working state.

Steve
by SteveBagley
Wed Mar 04, 2020 2:42 pm
Forum: hardware
Topic: Acorn Ethernet 3 podule EPROM and RISCiX
Replies: 9
Views: 1093

Re: Acorn Ethernet 3 podule EPROM and RISCiX

Over two years later, and I've finally got this working by burning RobC's ROM image and installing it into the Ether3. Well, I only burnt the first 32K since I only had 32K ROMs to hand but that seems to have worked. I also think I've sussed the reason it wasn't being recognised before. The podule h...
by SteveBagley
Wed Mar 04, 2020 12:39 pm
Forum: software
Topic: RISC iX - Cloned!
Replies: 187
Views: 24904

Re: RISC iX - Cloned!

Think I've found what the problem is -- it doesn't seem to like booting RISCiX if automatic monitor detection is turned on.

Steve
by SteveBagley
Mon Mar 02, 2020 10:29 am
Forum: hardware
Topic: New SCSI Host Adaptor
Replies: 38
Views: 879

Re: New SCSI Host Adaptor

I'd be interested in one too.

Steve
by SteveBagley
Sun Mar 01, 2020 8:43 pm
Forum: hardware
Topic: Partially Working A4000 - Help!!
Replies: 79
Views: 8722

Re: Partially Working A4000 - Help!!

Just a thought but I’m assuming fitting extra RAM off the motherboard still leaves the onboard RAM connected to the address and data bus and just disconnects the enable lines to the onboard RAM. Could the onboard RAM still be loading the address/ data bus weirdly and causing an issue?

Steve
by SteveBagley
Fri Feb 28, 2020 11:51 am
Forum: software
Topic: RISC iX - Cloned!
Replies: 187
Views: 24904

Re: RISC iX - Cloned!

That is important information because my R260 and also the A410/I run RO3 ( of course ). Did you do the writing also on an RO2 machine ?. No -- I wrote the SD card using dd on my Mac. I've just done some testing with Arculator and it seems to be something to do with the CMOS values since I've now g...
by SteveBagley
Fri Feb 28, 2020 10:24 am
Forum: hardware
Topic: A3000 repair -- keyboard connectors
Replies: 9
Views: 377

A3000 repair -- keyboard connectors

I'm in the middle of repairing an A3000 and everything seems to work except that it seems the keyboard connector no longer make contact with the keyboard properly. Does anyone know where I can order a replacement?

Thanks,

Steve
by SteveBagley
Fri Feb 28, 2020 10:22 am
Forum: software
Topic: RISC iX - Cloned!
Replies: 187
Views: 24904

Re: RISC iX - Cloned!

I've successfully written the RISCiX disk image (on 4corn) to an SD card for a SCSI2SD -- just use the same mechanism you would for writing an SD Card for a raspberry pi and then pop it in the SCSI2SD. It should then be recognised by the Arc and you can configure it as necessary -- although I've fou...
by SteveBagley
Thu Feb 20, 2020 7:18 pm
Forum: hardware
Topic: Partially Working A4000 - Help!!
Replies: 79
Views: 8722

Re: Partially Working A4000 - Help!!

I wanted to try a different screen mode, specifically MODE 28 (640x480 in 256 colour), but I get a "Bad screen mode" error. Is this expected? You probably need to modify the amount of memory set aside for the screen in the task manager (or by using *configure screensize -- I think) 160K should be e...
by SteveBagley
Mon Feb 17, 2020 12:25 pm
Forum: software
Topic: RISCiX Netboot
Replies: 9
Views: 909

Re: RISCiX Netboot

...suggests it might be possible to netboot RISCiX over Econet -- by running NFS over IP over Econet) The RISCiX "Acorn Unix Econet Device Driver and Network Device" document https://www.chiark.greenend.org.uk/~theom/riscos/docs/Acorn-Unix-Econet-Device-Driver-and-Network-Device.pdf makes mention o...
by SteveBagley
Mon Feb 17, 2020 10:38 am
Forum: software
Topic: RISC OS 2 Kernel Source code
Replies: 6
Views: 442

Re: RISC OS 2 Kernel Source code

Fascinating. I'm intrigued as to where this was found now :)

Steve
by SteveBagley
Sat Jan 11, 2020 7:55 pm
Forum: other vintage computer hardware, software and games
Topic: ZX Spectrum next... Anybody backing ?
Replies: 179
Views: 19167

Re: ZX Spectrum next... Anybody backing ?

Presumably there's nothing stopping an Acorn Second Processor being attached to the ZX Spectrum anyway. Hardware wise, the TUBE is all implemented in the second processor by the ULA, the TUBE connector is just contains part of the address bus and the data bus exactly the same signals as provided on ...
by SteveBagley
Sat Jan 11, 2020 12:05 am
Forum: hardware
Topic: Acorn ROM/RAM Podule Manager
Replies: 10
Views: 482

Re: Acorn ROM/RAM Podule Manager

Have just tested it with the BBC View ROM 'inserted' as well as the manager ROM, and I'm able to access that and run it in the 6502 Emulator :)

Steve
by SteveBagley
Fri Jan 10, 2020 11:05 pm
Forum: hardware
Topic: Acorn ROM/RAM Podule Manager
Replies: 10
Views: 482

Re: Acorn ROM/RAM Podule Manager

Have you seen the circuit diagram on the last page of the Acorn manual? (my ROM image was from the Acorn version). http://chrisacorns.computinghistory.org.uk/docs/Acorn/Manuals/Acorn_ROM_Podule_Guide.pdf It doesn't give detail of the GAL, but it should give you some clues. Yep, definitely useful --...
by SteveBagley
Fri Jan 10, 2020 10:27 pm
Forum: hardware
Topic: Acorn ROM/RAM Podule Manager
Replies: 10
Views: 482

Re: Acorn ROM/RAM Podule Manager

Yea -- I'm attempting to write an extension for Arculator to emulate it (mainly to get used to the API before implementing some more interesting podules. Just trying to reverse engineer how the podule maps the ROM's into the podule address space at the moment, other than that it looks reasonably str...
by SteveBagley
Fri Jan 10, 2020 11:40 am
Forum: general
Topic: Today I received.....
Replies: 5707
Views: 491589

Re: Today I received.....

An A3000 motherboard… http://wotan.computer/temp/a3000_mb.jpg Then just need to sort out a case for it (and fix the CMOS battery)… Well, almost three years later, I've finally obtained a case, keyboard and PSU for the motherboard -- just need to find out how much damage the battery did (I neutralis...
by SteveBagley
Thu Jan 09, 2020 10:33 pm
Forum: hardware
Topic: Acorn ROM/RAM Podule Manager
Replies: 10
Views: 482

Re: Acorn ROM/RAM Podule Manager

Yep, looks great thanks.

Steve
by SteveBagley
Thu Jan 09, 2020 8:42 pm
Forum: hardware
Topic: Acorn ROM/RAM Podule Manager
Replies: 10
Views: 482

Acorn ROM/RAM Podule Manager

Does anyone know if there is a dump of the Manager ROM found on Acorn's (or Computer Concepts) ROM/RAM podule available online or is anyone able to make one?

Steve
by SteveBagley
Thu Jan 09, 2020 1:57 pm
Forum: hardware
Topic: Emulating (or obtaining!) an ARM Evaluation System
Replies: 10
Views: 530

Re: Emulating (or obtaining!) an ARM Evaluation System

What I don't want to do is spend a lot of time prototyping on an emulated system that's similar to the ARM1 but different enough that when I finally come to try it on actual hardware it doesn't work. Hence my question being about the accuracy of existing emulation. How much changed between the ARM1...
by SteveBagley
Mon Jan 06, 2020 8:35 pm
Forum: acorn atom and system
Topic: Acorn System/Atom Econet
Replies: 15
Views: 926

Re: Acorn System/Atom Econet

The System Econet server software has been posted on stardot in the past, although I suspect you've already found that.

Steve