Search found 3062 matches

by jgharston
Sun Jun 24, 2018 11:35 pm
Forum: hardware
Topic: Floppy / Stiffy Drive setup
Replies: 12
Views: 160

Re: Floppy / Stiffy Drive setup

1. Would a BBC Master default to 40 or 80 track or must I always set it to the correct tract parameters via a *Drive 0 xx type of command? It defaults to neither, single-steps, using whatever the drive itself is set to. If you've set the drive to double-step, then the drive will double-step regardl...
by jgharston
Sat Jun 23, 2018 4:03 pm
Forum: off-topic
Topic: Using BBC BASIC to teach programming concepts in 2017
Replies: 49
Views: 1507

Re: Using BBC BASIC to teach programming concepts in 2017

I also checked out what the Montessori thinking is on computers. It seems to be to keep children under 12 away from computers, then to use them to teach typing skills, and in the final stages of school to use computers for research and essay writing. I have my doubts about Montessori, but it is at ...
by jgharston
Fri Jun 22, 2018 12:15 pm
Forum: emulators
Topic: When should keyboard interrupts be enabled during startup?
Replies: 6
Views: 490

Re: When should keyboard interrupts be enabled during startup?

(Note that before getting to the failure loop, it seems to read the byte 0xca that expands to a special string of length 0 and little effect -- so not sure what the deal is with that. It's put into the buffer at 0xdb2d.) That's function key 10 - the Break key. The RESET code puts &CA into the keybo...
by jgharston
Thu Jun 21, 2018 9:33 pm
Forum: hardware
Topic: Need help connecting BBC Master to Internet
Replies: 10
Views: 317

Re: Need help connecting BBC Master to Internet

I have Commstar on a usb stick and I cannot for the life of me get it to work. *SRLOAD just gives 'Bad Name' results when running from the RamFS in the data center. The USB drive in RAMFS isn't a proper drive, it's a "window" to the USB system. It only supports LOAD, SAVE, CAT, IMPORT and EXPORT. T...
by jgharston
Thu Jun 21, 2018 3:52 pm
Forum: archive submissions
Topic: Atom ROMs
Replies: 5
Views: 360

Re: Atom ROMs

Don’t know if the econet roms work. Having a running econet has been on the to-do list for the past 20 years at least. As they are Econet 2 they will only be able to talk to other Econet 2 systems, the definitive Econet protocol is Econet 3. Off the top of my head Econet 2 differs by: * 1-byte stat...
by jgharston
Wed Jun 20, 2018 10:38 pm
Forum: emulators
Topic: MAME: Acorn System
Replies: 17
Views: 567

Re: MAME: Acorn System

jgharston wrote:
Wed Jun 20, 2018 8:27 pm
Edit: I've got some System disk images, but I can't remember where they are at the moment, and probably being in a directory called "System" isn't going to help. ;) I'll set a file search going....
I've got a few more somewhere, but I've started tidying them to here.
by jgharston
Wed Jun 20, 2018 8:27 pm
Forum: emulators
Topic: MAME: Acorn System
Replies: 17
Views: 567

Re: MAME: Acorn System

The above explains bit 7 but BVS is checking bit 6 which is set if key>='@', how can this also detect no key pressed? Because: if no key is pressed, &E21 returns &FF which is %11111111, so bit 6=1, so BVS is followed. if a key >='@' is pressed, &E21 returns &40-&7F which is %01xxxxxx, so bit 6=1, s...
by jgharston
Tue Jun 19, 2018 7:30 pm
Forum: emulators
Topic: MAME: Acorn System
Replies: 17
Views: 567

Re: MAME: Acorn System

From your disassembly: BIT &0E21:BVS LFF6D :\ If key>='@' or no key pressed, skip past boot LDX #&04 :\ Normally SPACE-BREAK to boot Does this mean that if no key is pressed then &0E21 is &FF? Near enough. Documentation says: if bit 7 is set no key is pressed. If bit 7 is clear it is the keypress. ...
by jgharston
Tue Jun 19, 2018 4:28 pm
Forum: emulators
Topic: MAME: Acorn System
Replies: 17
Views: 567

Re: MAME: Acorn System

Similarly at power up does the Acorn DOS prompt appear without a disc in drive? Checking the code I believe it does. On Reset if no key is pressed it goes to the DOS prompt. If SPACE is pressed the disk in drive 0 is examined for the boot option and a BOOT file. The System 2 is not working as the C...
by jgharston
Fri Jun 15, 2018 6:47 pm
Forum: for sale / freebies
Topic: Moving House - Items to go
Replies: 26
Views: 808

Re: Moving House - Items to go

If nobody else has taken it, and Elminster can take it to Cambridge ABUG, I'll have the keyboard. Ta.
by jgharston
Fri Jun 15, 2018 6:45 pm
Forum: software & utilities for the pc, mac or unix
Topic: Acorn CP/M Formats
Replies: 5
Views: 180

Re: Acorn CP/M Formats

I've also uploaded the source for CPMFiler so you can see the comments and code structure:
http://mdfs.net/Software/CPM/Filer/
by jgharston
Fri Jun 15, 2018 2:35 pm
Forum: general
Topic: Acorn magazine collections question
Replies: 7
Views: 292

Re: Acorn magazine collections question

I have some gaps in my collection, I need to get around to typing it up.
by jgharston
Fri Jun 15, 2018 2:30 pm
Forum: software & utilities for the pc, mac or unix
Topic: Acorn CP/M Formats
Replies: 5
Views: 180

Re: Acorn CP/M Formats

http://mdfs.net/Docs/Comp/Disk/Format/AcornCPM Floppies: 256 bytes per sector (single) 512 bytes per sector (double) 10 sectors per track tracks count up side 0, then *down* side 1 3 reserved tracks - *always* single density 128 (single) 256 (double) directory entries 1024-byte (single) or 2048 (dou...
by jgharston
Thu Jun 14, 2018 10:44 am
Forum: hardware
Topic: Plus 1 and AP5 new issue.
Replies: 9
Views: 293

Re: Plus 1 and AP5 new issue.

What does *ROMS give you? Do you have a floppy disk interface plugged in? DFS disables itself if there is no floppy hardware present, I can't remember but ADFS may do the same.
by jgharston
Wed Jun 13, 2018 9:37 pm
Forum: software: other
Topic: Using BBC BASIC on a Homebrew Computer
Replies: 9
Views: 453

Re: Using BBC BASIC on a Homebrew Computer

So from what I can gather, I only need re-implement a small subset of the MOS or modify the source and it should at the very least run? I hope I'm not missing something important... Rather than modify the source, the simplest thing is to write a target-specific set of defines, particularly if you a...
by jgharston
Sun Jun 10, 2018 12:37 am
Forum: hardware
Topic: Floppy disc MOT program
Replies: 3
Views: 170

Re: Floppy disc MOT program

And the program has already been typed up.
by jgharston
Thu Jun 07, 2018 9:17 am
Forum: hardware
Topic: Gotek noob - trying to get beebug C to work on a datacentre
Replies: 49
Views: 679

Re: Gotek noob

I tried that thanks - C runs as a language ROM and is no longer available after *DTRAP. You only get BASIC. You could try *RAMTRAP which just disables DFS and leaves all other ROMs untouched: http://mdfs.net/Apps/Filing/RAMFS/ I'm surprised you're having trouble using C on non-DFS filing systems, i...
by jgharston
Wed Jun 06, 2018 5:20 pm
Forum: hardware
Topic: load from disc 1
Replies: 28
Views: 539

Re: load from disc 1

Back2skooldaze wrote:
Wed Jun 06, 2018 1:15 pm
when i type *EXEC !BOOT the light comes on the drive 1 top drive and then it flicks to drive 0 the bottom drive?
Looks like whever wrote the menu you are trying to run embedded a hardwired *DRIVE 0 in it, and needs beating around the head with a large clue stick.
by jgharston
Wed Jun 06, 2018 5:16 pm
Forum: other vintage computer hardware, software and games
Topic: Adopt Startdot for SWTPC!
Replies: 7
Views: 229

Re: Adopt Startdot for SWTPC!

Most of the documentation I dug through to work out 6800/6809 code and BIOS coding was SWTPC stuff. Interesting little machine.
by jgharston
Wed Jun 06, 2018 5:12 pm
Forum: hardware
Topic: ECONET WOES
Replies: 70
Views: 3043

Re: ECONET WOES

Do you: want to ask the file server what time it is on the file server? NetFS operation 16 - Read Date&Time ----------------------------------- result%=NetFS_Op(16, "") On exit: X%!4 current date X%!6 current time using BLib.NetFS : DIM ctrl% 127:X%=ctrl%:Y%=X%DIV256 DEFFNNetFS_Op(A%,A$):!X%=0:X%?1=...
by jgharston
Sat Jun 02, 2018 2:47 am
Forum: for sale / freebies
Topic: Having a clear out
Replies: 46
Views: 1329

Re: Having a clear out

BeebDOS please. :)
by jgharston
Sat Jun 02, 2018 2:43 am
Forum: upcoming and recent events & exhibitions
Topic: ABUG SOUTH 1 to 3 June 2018 (Hampshire) BOOKING THREAD
Replies: 125
Views: 6290

Re: ABUG SOUTH 1 to 3 June 2018 (Hampshire) BOOKING THREAD

Awe boo! I was presenting my accounts and treasurer's report this evening, would have much prefered to be Beeb-fiddling. ;)
by jgharston
Sat Jun 02, 2018 2:39 am
Forum: emulators
Topic: Econet for Arculator (and other emulators)
Replies: 13
Views: 575

Re: Econet for Arculator (and other emulators)

Call me crazy, but it would be nice to have an emulator-agnostic "podule emulation API" so that once a podule emulation has been written for one emulator, it can be used with another emulator just by copying the precompiled podule DLL and a few configuration files to the right location. Exactly wha...
by jgharston
Fri Jun 01, 2018 3:51 pm
Forum: upcoming and recent events & exhibitions
Topic: ABUG SOUTH 1 to 3 June 2018 (Hampshire) BOOKING THREAD
Replies: 125
Views: 6290

Re: ABUG SOUTH 1 to 3 June 2018 (Hampshire) BOOKING THREAD

Sorry I couldn't make it. I already needed to be in two different places this weekend, trying to be in three places at once would have been stretching it.
by jgharston
Fri Jun 01, 2018 11:44 am
Forum: software: other
Topic: Commstar II
Replies: 11
Views: 284

Re: Commstar II

Back in the 1990s I wrote XTerm and I was using it to send/fetch email via Arcade until about 2010.
f2=set baud rate, f7=MODE 7, f8=MODE 0
by jgharston
Mon May 28, 2018 12:10 am
Forum: stardot.org.uk
Topic: Image sizes
Replies: 59
Views: 735

Re: Image sizes

I've been trying to get https working on mdfs.net, but something's not right as it comes up with "insecure site: self-signed certificate". At some point I/somebody/gremlins killed uploading images to the Wiki, and I've been prioritising that at the moment.
by jgharston
Sat May 26, 2018 1:13 pm
Forum: stardot.org.uk
Topic: Image sizes
Replies: 59
Views: 735

Re: Image sizes

I process my images to 640x480 and that seems clear and distinct enough to see what's being show, eg:
Image

What would be nice is to get the width=xx% attribute working.
by jgharston
Fri May 25, 2018 2:54 pm
Forum: off-topic
Topic: Forum GDPR compliance?
Replies: 58
Views: 861

Re: Forum GDPR compliance?

Somebody demanding that an event be removed from history gives me the collie wobbles. My inclination is to ask: ok, lend me your time machine and advise when I should travel to to stop you causing that event to happen. If on 23rd Feb 2018 Fred Jones said Boo! then on 23rd Feb 2018 Fred Jones said Bo...