Search found 250 matches

by SteveBagley
Thu Dec 28, 2017 1:11 pm
Forum: 32-bit acorn hardware
Topic: Acorn Ethernet 3 podule EPROM and RISCiX
Replies: 9
Views: 1189

Acorn Ethernet 3 podule EPROM and RISCiX

Does anyone know what type of EPROM was used in the Acorn/Atomwide Ethernet III podule? I have one I’m trying to get working under RISCiX (on a heavily expanded A305 no less! :-)) but unfortunately the on-board EPROM is from 1998 and so crashes RISC OS 2 at boot when the modules (MBufManager I think...
by SteveBagley
Sun Nov 12, 2017 2:08 pm
Forum: 32-bit acorn hardware
Topic: Trojan Room Coffee Pot
Replies: 8
Views: 1188

Re: Trojan Room Coffee Pot

I was looking at the video digitiser colour adapter... It kind of looks like the other Wild Vision cards (unsurprisingly) but it's the only one I've seen that has a video out and I wasn't prepared to buy it based on a "might work" when I know that the WE digitiser will work as long as the hardware ...
by SteveBagley
Wed Oct 18, 2017 10:22 am
Forum: 32-bit acorn hardware
Topic: 10base-2 crossover?
Replies: 77
Views: 6326

Re: 10base-2 crossover?

That would turn it into a non-standard A3010 - but yes, that's the route to getting both going on an A3010 :D However, that mod's not for the faint hearted. Could you not modify the podule ROM to contain enough modules to TFTP boot the rest of the network modules needed to netboot the A3010 (i.e. a...
by SteveBagley
Sun Oct 15, 2017 8:55 pm
Forum: general
Topic: Today I received.....
Replies: 5819
Views: 510347

Re: Today I received.....

Over the past week really…

An Acorn AKA31 SCSI Podule off eBay and from CJE, an AEH54 Ethernet Podule and MEMC1A chip. Hopefully, this will let me get to the point being able to run RISC iX on one of my Archimedes.

Steve
by SteveBagley
Sun Oct 15, 2017 12:42 pm
Forum: 8-bit acorn software: other
Topic: BBC Domesday Project - Source code available
Replies: 13
Views: 2293

Re: BBC Domesday Project - Source code available

There are two possibilities really (and only more close examination of the code will tell)... 1) it was all developed on Masters and the code on the A500 is more related to Domesday Display and the other projects that came after or 2) Early A500s were used in the later stages of the project to spee...
by SteveBagley
Sun Oct 08, 2017 2:11 pm
Forum: 32-bit acorn software: other
Topic: RISC iX - Cloned!
Replies: 187
Views: 25902

Re: RISC iX - Cloned!

This seems to be the best place to ask about RISX iX — there'll probably be a few more questions coming as I intend to upgrade one of my Arcs and install it for a play (I wonder if it’ll be the first A305 upgraded to be able to run Risc iX ;-)) But, I was reading about the Acorn R225 diskless Unix w...
by SteveBagley
Sat Sep 30, 2017 2:13 pm
Forum: 32-bit acorn software: other
Topic: ST-506 Hard disc image creation
Replies: 17
Views: 1687

Re: ST-506 Hard disc image creation

I was trying to avoid having to write anything, I was looking for something that would just work. I don't have any other ADFS hard disc to try it on, and I don't want to be using the old drive any longer than necessary. I came across this a couple of years ago -- looks like the programming has alre...
by SteveBagley
Tue Sep 12, 2017 8:01 am
Forum: 32-bit acorn hardware
Topic: Resurrecting A5000
Replies: 41
Views: 5166

Re: Resurrecting A5000

With my A5000 temporarily (I hope) dead, I've got the drives in an A4000. I've been using it to back up the server. Yea gods, the A4000 is slow. I take it the A4000 is the Acorn Electron of the RISC OS world. A compatible machine but with all the memory access crippled. The main difference is CPU s...
by SteveBagley
Tue Aug 08, 2017 11:19 pm
Forum: 8-bit acorn hardware
Topic: 68B54 emulation = wifi enabled Master
Replies: 23
Views: 2640

Re: 68B54 emulation = wifi enabled Master

One option that might help, given that ANFS isn't standard on any Beeb (save the MasterET) is to also alter ANFS as well to make it work better with the ESP8266. There's lots of things ANFS has to deal with that cannot happen when it is interfacing with the ESP8266 (e.g. line busy, network collision...
by SteveBagley
Thu Aug 03, 2017 8:40 pm
Forum: 8-bit acorn hardware
Topic: Domesday86 Project
Replies: 82
Views: 7341

Re: Domesday86 Project

(As a side note - I wonder if the original 1" tape used to master the discs was transferred in the BBC's archive project. That would be on both Digtal Betacam and uncompressed SD 601 on LTO tape - in component 4:2:2 format decoded via a BBC TRANSFORM PAL decoder - the highest quality PAL decoder av...
by SteveBagley
Tue Aug 01, 2017 10:51 pm
Forum: 32-bit acorn hardware
Topic: BBC A3000 + Watford Electronics ARM3 - installation woes
Replies: 24
Views: 1870

Re: BBC A3000 + Watford Electronics ARM3 - installation woes

Just a thought but did the A3000 ever ship with MEMC1 (or has one been used to repair it)? That wasn't compatible with the ARM3 iirc.

Steve
by SteveBagley
Mon Jul 31, 2017 5:30 am
Forum: introduce yourself
Topic: Hello everyone
Replies: 10
Views: 1593

Re: Hello everyone

Serial would work, it's what I did before, but as the HD doesn't work I can't load up the terminal program I used to send the files like I did before! I suppose I could always code up something very simple from scratch to receive serial bytes and write them to a file, at least to get some kind of p...
by SteveBagley
Wed Jul 19, 2017 10:42 pm
Forum: other vintage computer hardware, software and games
Topic: Show us your retro computers
Replies: 103
Views: 10115

Re: Show us your retro computers

This report and pictures, written by one of our PhD students, about our display of old computers at our graduation yesterday might amuse people -- particular the bit about the Beeb releasing Magic Smoke in the middle! http://aaronsplace.co.uk/blog/2017-07-18-university-of-nottingham-computer-science...
by SteveBagley
Mon Jul 17, 2017 1:42 am
Forum: general
Topic: Archimedes 30th birthday?
Replies: 12
Views: 1666

Re: Archimedes 30th birthday?

Thanks for the tip-off -- hope we did it justice!

https://www.youtube.com/watch?v=rh7kpkwXnwA

Steve
by SteveBagley
Sat Jun 03, 2017 4:18 pm
Forum: off-topic
Topic: x86 Internals for Fun & Profit
Replies: 12
Views: 1766

Re: x86 Internals for Fun & Profit

I wonder if Intel wouldn't be better off just dumping the baggage and exposing whatever RISC core they use inside the x86 processors. Maybe as the conventional computing world moves towards ARM they'll have to do something like that to stay relevant. ARM CPUs are just as complex inside these days -...
by SteveBagley
Fri Jun 02, 2017 11:56 am
Forum: 8-bit acorn hardware
Topic: 80 column teletext
Replies: 30
Views: 3856

Re: 80 column teletext

Sinclair found that often you can reduce the refresh frequency to lower than the manufacturers stated frequency, and the DRAM chips will still retain their contents. Of course, there are limits to how long you can go between refreshing before intermittent memory corruption occurs... A friend of min...
by SteveBagley
Fri Jun 02, 2017 11:23 am
Forum: 8-bit acorn hardware
Topic: Upgrades to make Master out of an Electron?
Replies: 14
Views: 1935

Re: Upgrades to make Master out of an Electron?

Thinking through my shadow RAM idea some more, it might just work. With ~40k 2MHz clock cycles per frame, the 6502 would have to be to be working pretty hard to write more than 9728 bytes per frame. If the CPLD used part of the attached SRAM to keep a ring buffer of addresses that had been written ...
by SteveBagley
Wed May 31, 2017 2:43 pm
Forum: programming
Topic: 6502 BASIC Compiler
Replies: 25
Views: 3375

Re: 6502 BASIC Compiler

If you wrote a threaded code compiler (as, if I remember correct, at least one of the BASIC compilers did on the Arc) Was there more than 1 Arc Compiler? I only found details about the ABC one, which was written by Paul Fellows and later owned by Oak and then Castle. Was there more? I had a hooky c...
by SteveBagley
Wed May 31, 2017 11:20 am
Forum: programming
Topic: 6502 BASIC Compiler
Replies: 25
Views: 3375

Re: 6502 BASIC Compiler

BASIC on the Acorn 8 bit computers essentially runs on a virtual machine (abstracted 32bit integers and 5 byte floating point IIRC). VMs have a major advantage of reducing code size at the expense of speed. Good examples are Steve Woz's Sweet 16 and the Zork VM (many online references for both of t...
by SteveBagley
Thu May 25, 2017 1:33 pm
Forum: 8-bit acorn hardware
Topic: Possibly Unscanned Acorn Circuit Diagrams - Need Help!
Replies: 18
Views: 2725

Re: Possibly Unscanned Acorn Circuit Diagrams - Need Help!

System Things (some have been previously available in different editions) (OLD) 6502 Microcomputer PCB Circuit Diagram (System 1) (100,000/C) (OLD) Keyboard, Display & Cassette Interface PCB (System 1) (100,001/C) 40 x 25 VDU PCB (Teletext) (100,002/C) 8K RAM + 8K PROM PCB Circuit Diagram (100,003/...
by SteveBagley
Mon May 22, 2017 9:27 pm
Forum: other vintage computer hardware, software and games
Topic: Fixing a Superbrain up
Replies: 201
Views: 13886

Re: Fixing a Superbrain up

Hi Mark It's an MFM drive, like an ST506. I have no other interface like it - the oldest I have is on the P2000C and it's SASI. So I'd need an interface, probably a PC one, with the split data / control ribbons to connect to the drive. Also some test software so I can see if it is still alive. Got ...
by SteveBagley
Thu May 18, 2017 12:05 pm
Forum: off-topic
Topic: Nooooo!
Replies: 11
Views: 2036

Re: Nooooo!

jonb wrote:Ah, but he does produce <computerphile> videos - I thought they were all by Notts Uni? Guess not!
Yea, he's done quite a few Computerphiles :) Most people on the channel are from Nottingham, but not all (e.g. Steve Furber!)

Steve
by SteveBagley
Thu May 18, 2017 11:36 am
Forum: off-topic
Topic: Nooooo!
Replies: 11
Views: 2036

Re: Nooooo!

jonb wrote:Interestingly, the speaker in that video has a colleague at Nottingham University called Tom Scott, who produced this: https://www.youtube.com/watch?v=ld3A3QCpXd4
Tom doesn't work here at Nottingham -- he's based in London I think…

Steve
by SteveBagley
Thu May 18, 2017 8:36 am
Forum: general
Topic: Today I received.....
Replies: 5819
Views: 510347

Re: Today I received.....

Zarchos wrote: Nope...
Have a look again ...
Serial chip? :-)

Steve
by SteveBagley
Fri May 12, 2017 6:50 pm
Forum: off-topic
Topic: Windows Technical Support v a BBC Master 128
Replies: 8
Views: 1038

Re: Windows Technical Support v a BBC Master 128

I once had the idea to write a program to convert the several gigabytes of a typical windows installation into Spectrum loading sounds and then play them it while 'I wait for Windows to load'… :-)

Steve
by SteveBagley
Fri May 12, 2017 10:40 am
Forum: other vintage computer hardware, software and games
Topic: Fixing a Superbrain up
Replies: 201
Views: 13886

Re: Fixing a Superbrain up

My probes are on the Z80 socket on the Superbrain board, not on the Z80 itself (mounted on the ICE board). So I read this as meaning I shouldn't see any activity in the ICE's Quit mode (because the signals are isolated from the host system), but may see activity if I probe the Z80 on the ICE board....
by SteveBagley
Thu May 11, 2017 4:42 pm
Forum: other vintage computer hardware, software and games
Topic: Fixing a Superbrain up
Replies: 201
Views: 13886

Re: Fixing a Superbrain up

Further to Dave's post above, I've just written a little program to compare the three outputs above. The top nibble (D7-D4) is identical between all three files, however the lower nibble (D0-D3) can have changes in any of the bit positions…

Steve
by SteveBagley
Fri May 05, 2017 10:48 am
Forum: other vintage computer hardware, software and games
Topic: Show us your retro computers
Replies: 103
Views: 10115

Re: Show us your retro computers

I'm seeing a Master, an Atari ST, It's an Atari Falcon next to the Master, and a MegaSTE by the window. an early Archimedes, a Mac Classic, what could be an IBM PC. Oh, and I see an Apple II as well! Yep, an A310 (upgraded to ARM3/4MB), a Mac Plus, an IBM XT. You missed the Atom sitting on top of t...
by SteveBagley
Tue May 02, 2017 7:32 pm
Forum: for sale / freebies
Topic: Is the Retro Bubble going a bit flat?
Replies: 34
Views: 3632

Re: Is the Retro Bubble going a bit flat?

It'll be fascinating to see what happens next year after the film of 'Ready Player One' is released. Given the number of retro-computer/gaming references in that I can see it starting another bubble.

Maybe time to start investing in 'spares'…

Steve
by SteveBagley
Thu Apr 27, 2017 11:32 pm
Forum: other vintage computer hardware, software and games
Topic: Show us your retro computers
Replies: 103
Views: 10115

Re: Show us your retro computers

I think most of mine can be spotted in the background of this video about the Sun3/160 I'm trying to revive :-)

https://youtu.be/x23NUPWtDFY

Steve

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