Search found 2728 matches

by jgharston
Tue Nov 21, 2017 1:47 am
Forum: upcoming and recent events & exhibitions
Topic: ABUG EAST MIDLANDS (Winter Warmer) 17-19 November 2017 (Leicestershire) BOOKING THREAD
Replies: 133
Views: 4122

Re: ABUG EAST MIDLANDS (Winter Warmer) 17-19 November 2017 (Leicestershire) BOOKING THREAD

sPhilMainwaring wrote:Some more Clwyd Technics references are here:
http://phils-place.co.uk/work/

Ooo. Talking about head-mounted finglongerers, watch closely from 2:40 into this video :)
by jgharston
Sun Nov 19, 2017 1:12 pm
Forum: upcoming and recent events & exhibitions
Topic: ABUG EAST MIDLANDS (Winter Warmer) 17-19 November 2017 (Leicestershire) BOOKING THREAD
Replies: 133
Views: 4122

Re: ABUG EAST MIDLANDS (Winter Warmer) 17-19 November 2017 (Leicestershire) BOOKING THREAD

Hi Kees ... yes this is the conclusion we came to. We got to the point of logging in, *DIR, *CAT, LOAD, SAVE, *LOAD and executing *VIEW and *REMOTE but then getting not listening errors If only we knew someone who was good at disassembling and reprogramming 6502 code :-P *PROT and *UNPROT work perf...
by jgharston
Sun Nov 19, 2017 1:04 pm
Forum: hardware
Topic: read / write to JIM
Replies: 28
Views: 583

Re: read / write to JIM

DC/etc are implemented as per the Acorn intent, &FCFF for the 256-byte page within a bank of 64K, with &FCFE and lower if implemented select what bank of 64K, etc. as in BeebEx.gif which implements a 16M address range with two latches. Is there any clear documentation of exactly what Acorn'...
by jgharston
Sun Nov 19, 2017 1:01 pm
Forum: hardware
Topic: read / write to JIM
Replies: 28
Views: 583

Re: read / write to JIM

That's not quite the point I was getting at. If _I_ set FCFD then DC comes along and sets FCFE/FF but not FD it will trample _my_ RAM instead of writing its own RAM - not what is wanted. So I would have to reset FCFD to 0 after every transaction and not call any disk routines until I reset FCFD.. W...
by jgharston
Fri Nov 17, 2017 5:34 pm
Forum: hardware
Topic: read / write to JIM
Replies: 28
Views: 583

Re: read / write to JIM

I wasn't being petulant in my second post - I just assumed nobody had anything JIM based...and it was 1.09am->12.35pm so I left eleven and a half hours, I'm still working on the time-travel machine but I suspect that I may need more than a 1MHz bus to drive it... Weird that at this end it's claimin...
by jgharston
Fri Nov 17, 2017 5:05 pm
Forum: upcoming and recent events & exhibitions
Topic: ABUG EAST MIDLANDS (Winter Warmer) 17-19 November 2017 (Leicestershire) BOOKING THREAD
Replies: 133
Views: 4122

Re: ABUG EAST MIDLANDS (Winter Warmer) 17-19 November 2017 (Leicestershire) BOOKING THREAD

I've been trying to download the Pico package from here https://www.riscosopen.org/content/sales/risc-os-pico for the last week, and keep getting no connection. Does anybody know of an alternative download (or already have it)? this one? That looks like it, ta! The link to RO-Open still gives me a ...
by jgharston
Fri Nov 17, 2017 9:48 am
Forum: upcoming and recent events & exhibitions
Topic: ABUG EAST MIDLANDS (Winter Warmer) 17-19 November 2017 (Leicestershire) BOOKING THREAD
Replies: 133
Views: 4122

Re: ABUG EAST MIDLANDS (Winter Warmer) 17-19 November 2017 (Leicestershire) BOOKING THREAD

JGH: could you bring any RiscOS Pico for the Raspberry Pi (Compiled for OSWORD and OSWRCH) thingymagig bits and files please so I can try and install it on my Pi I've been trying to download the Pico package from here https://www.riscosopen.org/content/sales/risc-os-pico for the last week, and keep...
by jgharston
Fri Nov 17, 2017 9:41 am
Forum: hardware
Topic: read / write to JIM
Replies: 28
Views: 583

Re: read / write to JIM

I'm guessing they'd have kept running through JIM pages, starting at &00, doing JMP (&FDFE) on any page where &FDFF contained &FD, until the interrupt went away. ... It's almost tempting to make a toy which does that! There was an EPROM programmer somebody brought to ABUG Bolton a c...
by jgharston
Fri Nov 17, 2017 9:20 am
Forum: hardware
Topic: read / write to JIM
Replies: 28
Views: 583

Re: read / write to JIM

Is there anyone out there who has expansion RAM in JIM? If I knock up some tools would there be interest, any help with testing? The DataCentre has 1M of RAM page-wide RAM, and I've also got a Sprow 8M byte-wide RAM card. When updating RAMFS a couple of years ago I wrote some extended RAM load/save...
by jgharston
Fri Nov 17, 2017 9:03 am
Forum: hardware
Topic: read / write to JIM
Replies: 28
Views: 583

Re: read / write to JIM

I guess not then! I must have not worken up properly yet, but you seem to have given people a negative amount of time to respond before deciding nobody was going to reply. Your first post was at 12:09, and your reply was at 11:35, half an hour earlier! Is there anyone out there who has expansion RA...
by jgharston
Fri Nov 17, 2017 8:54 am
Forum: hardware
Topic: Turning off ROMs on Model B OS 1.2
Replies: 12
Views: 779

Re: Turning off ROMs on Model B OS 1.2

I found that nothing seems to work to disable DFS 0.9 Yes, DFS 0.90 doesn't have the disable-myself-if-no-hardware-present functionality which DFS 1.00 and later has, and was followed into other ROMs. DFS 1.00 and later had this feature added as it was in a 16K ROM with two 8K filing systems in it,...
by jgharston
Fri Nov 17, 2017 8:43 am
Forum: upcoming and recent events & exhibitions
Topic: ABUG EAST MIDLANDS (Winter Warmer) 17-19 November 2017 (Leicestershire) BOOKING THREAD
Replies: 133
Views: 4122

Re: ABUG EAST MIDLANDS (Winter Warmer) 17-19 November 2017 (Leicestershire) BOOKING THREAD

I've fallen out of bed and try and get a nice early start. A couple of cups of tea to wake up, then I'll start dismantling stuff to put in the car. Might even be there in time for lunch. :)
by jgharston
Wed Nov 15, 2017 7:16 pm
Forum: hardware
Topic: Unix on the Beeb
Replies: 36
Views: 1018

Re: Unix on the Beeb

So, if I understand correctly we have a PDP emulator running on a real ARM in the form of Pi Tube Direct. In all of that do we have a portable (e.g C) PDP emulator or is it in ARM assembler? There's a portable PDP Emulator here , written in BBC BASIC. :) Currently, single memory space, no MMU, but ...
by jgharston
Mon Nov 13, 2017 3:42 pm
Forum: emulators
Topic: MAME: Tube devices
Replies: 66
Views: 2601

Re: MAME: Tube devices

It looks like the TEQS opcode isn't working. 0000A04: TEQS R0, #$48 ; 'H' 0000A08: BEQ $ff000d68 ; Check for 'HELP' 0000A0C: TEQS R0, #$47 ; 'G' 0000A10: BEQ $ff000e08 ; Check for 'GO' 0000A14: TEQS R0, #$43 ; 'C' When issuing the command *HELP that TEQS R0,ASC"H" isn't matching. Or, earli...
by jgharston
Mon Nov 13, 2017 3:24 pm
Forum: emulators
Topic: MAME: Tube devices
Replies: 66
Views: 2601

Re: MAME: Tube devices

At the very least *HELP should give a response as it's processed on the client side before being passed to the host.

*HELP should print Supervisor blah blah and then pass the command to the host, so if client<->host command passing was failing you would at least get the client's help message.
by jgharston
Sun Nov 12, 2017 8:16 pm
Forum: software: other
Topic: DOS Plus assisstance
Replies: 6
Views: 179

Re: DOS Plus assisstance

marcusjambler wrote:Starting to get somewhere with this....
It turns out that the ERASE command works with internal PI copro tube connection and not with External tube connection.
That is...... weird!
by jgharston
Sun Nov 12, 2017 8:14 pm
Forum: software: other
Topic: BBC Basic for Z80
Replies: 19
Views: 510

Re: BBC Basic for Z80

I suppose I'm being dumb again but why a single sequential and a double sided interleaved disk for the same file set or are they different ? JGHCPM1 and JGHCPM1d JGHCPM1 is a standard sequential disk image, where sector N is at offset N*B into the image, where sector N+1 is always and invariably im...
by jgharston
Sun Nov 12, 2017 8:04 pm
Forum: wanted
Topic: Adapter and device that reliably produce Disc Error 23
Replies: 13
Views: 316

Re: Adapter and device that reliably produce Disc Error 23

Hardware error recovering code is definitiely the hardest to write, as to test it comprehensively you need a set of circumstances to consitantly and repeatedly exists that in real use you wish would never happen and manufacturers go to some lengths to prevent!
by jgharston
Sun Nov 12, 2017 8:01 pm
Forum: wanted
Topic: Adapter and device that reliably produce Disc Error 23
Replies: 13
Views: 316

Re: Adapter and device that reliably produce Disc Error 23

Ok, I had that cup of tea and trawled through the ADFS sources. RISC OS does translate IDE controller results to higher level results, in this case to the equivalent ST506 results, adding to them where no equivalent ST506 result exists. Error 23 is WinIDEErrTimeout * &23 ; controller did not res...
by jgharston
Sun Nov 12, 2017 6:02 pm
Forum: wanted
Topic: Adapter and device that reliably produce Disc Error 23
Replies: 13
Views: 316

Re: Adapter and device that reliably produce Disc Error 23

What's disk error 23? IDE errors are a bitmap, so you would only ever expect a single bit to be set at any time: Status Error &80 Busy &80 Bad block &40 Drive Ready &40 Uncorrectable data error &20 Drive Write Fault &20 Media changed &10 Drive Seek Complete &10 Sector...
by jgharston
Sun Nov 12, 2017 12:18 am
Forum: software: other
Topic: BBC Basic for Z80
Replies: 19
Views: 510

Re: BBC Basic for Z80

Andrewcee wrote:Had cpm running from a turbo MMC albeit have still to work out how to change MMC disks from cpm.

If you have a CPM boot disk with the SJCCP instead of the DRCCP you can issue *commands from the CPM> prompt. See also JGHCPM1 disk.
by jgharston
Sun Nov 12, 2017 12:12 am
Forum: for sale / freebies
Topic: For free: two boxes of Acorn mags
Replies: 10
Views: 306

Re: For free: two boxes of Acorn mags

I have a box of duplicates, I'll bring mine to the party as well. !
by jgharston
Sun Nov 12, 2017 12:08 am
Forum: acorn atom
Topic: Acorn Atom Econet
Replies: 12
Views: 366

Re: Acorn Atom Econet

Phil Mainwaring prodded me to do some more digging, and down in misc.incoming.unsorted.misc was a bunch of Sys/Atom DOS disk images, one with a System Level II File Server on it with the bonus of System and Atom networking utility commands *DISCS, *INF, *PROT, *REMOTE, *UNPROT, *USERS, *VIEW. I've t...
by jgharston
Thu Nov 09, 2017 4:10 pm
Forum: community projects
Topic: Remastered BBC B and B+ User Guides
Replies: 7
Views: 186

Re: Remastered BBC B and B+ User Guides

I notice the manual perpetuates the error with file access bits, which has propagated into a lot of other documentation, and even caused several people to write their own software incorrectly. So I'll post this here so it is in public. The file access byte at XY+14 after calling OSFILE indicates whe...
by jgharston
Thu Nov 09, 2017 3:50 pm
Forum: community projects
Topic: Remastered BBC B and B+ User Guides
Replies: 7
Views: 186

Re: Remastered BBC B and B+ User Guides

Wonderful work. I've spotted a couple of typos (eg OSBYTE 2, X=3 should be X=2). I'll go through it in more detail when I get around to i.
by jgharston
Thu Nov 09, 2017 1:27 pm
Forum: software: other
Topic: BBC Basic for Z80
Replies: 19
Views: 510

Re: BBC Basic for Z80

KayjayUK wrote:I also have the option of writing Z80 assembler using my copy of Romas cross assembler in standard 6502 mode then running it under Z80 copro, this will eliminate the necessity for Z80ROM.

Before I got Z80 BASIC I used Rowland Waddilove's assembler translated into BBC BASIC.
by jgharston
Thu Nov 09, 2017 1:21 pm
Forum: hardware
Topic: Unix on the Beeb
Replies: 36
Views: 1018

Re: Unix on the Beeb

Ah, what will be happening is that the Unix console will be sending anything it doesn't understand to the the system the emulator is running on. Which in this case is ultimately the BBC VDU, so by the accident of you running the PDP11 emulator on a system with the BBC VDU drivers, you are sending to...

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