Search found 1900 matches

by jms2
Sun Feb 18, 2018 9:07 pm
Forum: projects
Topic: Making reasonable progress with a Sudoku solver
Replies: 35
Views: 725

Re: Making reasonable progress with a Sudoku solver

Very nice, and I'm reassured to see that a Beeb can do it a lot faster than an Atari (I'm guessing this is a 2MHz vs 1MHz effect). Does the extra memory on a Master help? And also, do you plan to implement the memory use and other stats from the Atari version?
by jms2
Thu Feb 15, 2018 11:02 pm
Forum: hardware
Topic: Mega Games Cartridge (MGC) MK II Hardware Development
Replies: 25
Views: 743

Re: Mega Games Cartridge (MGC) MK II Hardware Development

I am definitely going to give that a go... sounds excellent, and a massive amount of work to create it! =D>
by jms2
Thu Feb 15, 2018 8:10 am
Forum: hardware
Topic: Running DosPlus (version 2.1) with Raspberry Pi 80286 processor emulator on BBC master 128.
Replies: 33
Views: 1522

Re: Running DosPlus (version 2.1) with Raspberry Pi 80286 processor emulator on BBC master 128.

hoglet wrote:I have never managed to get DOS Plus to work on the Electron.


Ok, that’s good to know - what I’m seeing is normal!
by jms2
Thu Feb 15, 2018 8:07 am
Forum: hardware
Topic: Running DosPlus (version 2.1) with Raspberry Pi 80286 processor emulator on BBC master 128.
Replies: 33
Views: 1522

Re: Running DosPlus (version 2.1) with Raspberry Pi 80286 processor emulator on BBC master 128.

After setting the attributes for the file ‘panos’, I found I did not need to unplug anything to get to the Panos prompt. However I have not tested further than that.
by jms2
Wed Feb 14, 2018 11:52 pm
Forum: hardware
Topic: Running DosPlus (version 2.1) with Raspberry Pi 80286 processor emulator on BBC master 128.
Replies: 33
Views: 1522

Re: Running DosPlus (version 2.1) with Raspberry Pi 80286 processor emulator on BBC master 128.

By mounting the DFS disk images for Panos on BeebEm, I've been able to manually copy across the load and exec addresses for the "Panos" boot file, and Panos now boots! :D I guess I have to copy the attributes for the other files as well in order to be able to use it - or does Panos not rea...
by jms2
Wed Feb 14, 2018 11:04 pm
Forum: hardware
Topic: Running DosPlus (version 2.1) with Raspberry Pi 80286 processor emulator on BBC master 128.
Replies: 33
Views: 1522

Re: Running DosPlus (version 2.1) with Raspberry Pi 80286 processor emulator on BBC master 128.

I've downloaded danielj's Dosplus + GEM SCSI image and copied the DOSBOOT file and DOS folder (containing DRIVE_C) onto my BeebSCSI. However, I can't get the boot process to complete. I do get the Digital Research screen (complete with logo) and a message saying press Return to load DOS from HD. Omi...
by jms2
Sun Feb 11, 2018 11:09 pm
Forum: hardware
Topic: Mega Games Cartridge (MGC) MK II Hardware Development
Replies: 25
Views: 743

Re: Mega Games Cartridge (MGC) MK II Development

hoglet wrote:Some work was started on this:
http://www.stardot.org.uk/forums/viewto ... =3&t=12794

That's impressive, I didn't know about that. Well done Ray. =D>
by jms2
Sun Feb 11, 2018 10:06 pm
Forum: hardware
Topic: Mega Games Cartridge (MGC) MK II Hardware Development
Replies: 25
Views: 743

Re: Mega Games Cartridge (MGC) MK II Development

This all sounds very interesting! One question I have relates to the method of delivery of the disc images themselves. The old MMB interface was reliant on the STH collection, which grouped together BBC games into compilation SSD files such that there were fewer than 512 of them. As far as I'm aware...
by jms2
Sat Feb 10, 2018 1:48 pm
Forum: hardware
Topic: P.R.E.S. AP3 and &E00
Replies: 24
Views: 478

Re: P.R.E.S. AP3 and &E00

Actually I got my Elk from WH Smith in Hounslow, basic 32K machine, serial number 02-ALA01-00 43815. Some time later I wanted to use it for word processing, writing essays for my PGCE course, so got a Plus 1, View and a printer then quickly found out how little memory I had left for View files. I'd...
by jms2
Sat Feb 10, 2018 10:20 am
Forum: hardware
Topic: Reading original RiscPC IDE drive from a modern RiscOS
Replies: 6
Views: 425

Re: Reading original RiscPC IDE drive from a modern RiscOS

That's great news! I remember some cryptic comments back at the time relating to the fate of SR3, implying dodgy dealings by someone or other. I really wouldn't want to revive the kind of name-calling that went on in those days, but it would be good to hear about what happened to the game. And any f...
by jms2
Fri Feb 09, 2018 11:05 pm
Forum: hardware
Topic: P.R.E.S. AP3 and &E00
Replies: 24
Views: 478

Re: P.R.E.S. AP3 and &E00

Conversely, though, my wife is likely to be greatly amused by this story! On a less frivolous note though, I see you got your Electron in 1985. The fact that it's a 64k machine makes me think you perhaps bought one of the bankrupt stock machines which were upgraded with the MRB and bundled with soft...
by jms2
Thu Feb 08, 2018 5:20 pm
Forum: hardware
Topic: P.R.E.S. AP3 and &E00
Replies: 24
Views: 478

Re: P.R.E.S. AP3 and &E00

My understanding is this: 1) Your Master RAM board will not help with PAGE. This is because it provides shadow (screen) memory, allowing HIMEM to be raised but not affecting PAGE. In any case, games won't work in Shadow mode. :( 2) From the other thread, Rom slot 1 in the AP3 has a RAM overlay which...
by jms2
Wed Feb 07, 2018 3:10 pm
Forum: software: other
Topic: BASIC weirdness
Replies: 9
Views: 318

Re: BASIC weirdness

What value was PAGE at on the Electron? If it was &1D00, can you try the same on the Master to see if that causes the fault to recur?
by jms2
Mon Feb 05, 2018 10:57 pm
Forum: hardware
Topic: Electron Slogger Plus 1 Expansion
Replies: 3
Views: 176

Re: Electron Slogger Plus 1 Expansion

The Slogger rom will be compatible with the MRB, but i would guess that only *buffer makes direct use of it. That command provides a printer buffer, something which is less useful in a retro computing context than it was originally. The other commands are just generally useful and allow you to list,...
by jms2
Sun Feb 04, 2018 2:59 pm
Forum: general
Topic: very cheap pcb spacers
Replies: 6
Views: 170

Re: very cheap pcb spacers

=D> That's very clever!
by jms2
Thu Feb 01, 2018 8:36 pm
Forum: hardware
Topic: AP6 curious behaviour
Replies: 15
Views: 493

Re: AP6 curious behaviour

On a serious note, as shown on the facebook group I love the acorn electron, we have made some progress transferring adfs disc images to the CF HD Interface connected to the AP5. Would be great to run virtually the whole of the Elk Library from one 512mb CF HD image :-) Well done! How are you doing...
by jms2
Tue Jan 30, 2018 8:51 pm
Forum: hardware
Topic: AP6 curious behaviour
Replies: 15
Views: 493

Re: AP6 curious behaviour

Yes, as Dave has mentioned before, the AP5 has the hardware support for a version of ADFS which uses a 4k RAM buffer at the top end of its address space to bring PAGE down to &E00. However, as I understand it there isn't such a version of ADFS in existence that still includes hard disk support. ...
by jms2
Tue Jan 30, 2018 8:04 pm
Forum: hardware
Topic: AP6 curious behaviour
Replies: 15
Views: 493

Re: AP6 curious behaviour

I have updated the AP6 rom to V1.30, and this has fixed the spurious display of roms. :D Thanks! My Elk seems to enjoy throwing bizarre problems at me though. :( This latest one is totally weird. I found it when knocking together a quick relocator program to run AMX Art from ADFS (it needs to run at...
by jms2
Sat Jan 27, 2018 5:29 pm
Forum: wanted
Topic: Acorn Electron Sound Expansion Cartridge
Replies: 10
Views: 1390

Re: Acorn Electron Sound Expansion Cartridge

I have always been a bit intrigued by these cartridges. They must be incredibly rare. Those roms seem to contain quite a lot of junk data though - the v1 version seems to contain some EPROM programmer code, and the v3 version has some assembler in it (I mean assembly language text, ie source code). ...
by jms2
Sat Jan 27, 2018 9:43 am
Forum: software: other
Topic: Compressed ROMs
Replies: 16
Views: 1266

Re: Compressed ROMs

Why would it be odd? How else would the keyboard handler supply the characters that are printed in red on the Electron keyboard keys? I thought the current language was supposed to provide them in response to calls to the language entry point with A=2,3? And, after all, BASIC does have to contain t...
by jms2
Sat Jan 27, 2018 9:39 am
Forum: software: other
Topic: Compressed ROMs
Replies: 16
Views: 1266

Re: Compressed ROMs

daveejhitchins wrote:Would there be any games playable at Turbo speeds?


It varies depending on the game. For some it made no difference, others became unplayable and a few were actually improved.
by jms2
Thu Jan 25, 2018 8:32 pm
Forum: hardware
Topic: AP6 curious behaviour
Replies: 15
Views: 493

Re: AP6 curious behaviour

Wow . . . You've got a full machine! That's not all - I didn't mention the MMC and the Pegasus interface - both of which also work alongside the AP5! And there's also my other Elk, which has an MRB, Plus 3 and ram/rom board. I think I have succeeded in scratching the itch that I had back in the 80s...
by jms2
Thu Jan 25, 2018 8:19 pm
Forum: hardware
Topic: P.R.E.S. AP5 - Original and Re-Design
Replies: 258
Views: 17470

Re: P.R.E.S. AP5 - Original and Re-Design

It isn't easy to find, so I've attached it here.

This is the BBC version, patched by Martin Barr to refer to the Elk user port addresses. BUT, he later showed that it is byte-for-byte identical with the official version released by PRES. Some functions don't work, but this was the case BITD.
by jms2
Wed Jan 24, 2018 11:34 pm
Forum: hardware
Topic: AP6 curious behaviour
Replies: 15
Views: 493

Re: AP6 curious behaviour

Gosh, I didn't realise I was a VIP!

That's great anyway, thanks for the link - another problem sorted.

And even better, I see the 16k version has Treecopy in it. Brilliant. =D>
by jms2
Wed Jan 24, 2018 7:41 pm
Forum: emulators
Topic: MODE 7 on RISC OS BBC Emulator 6502em
Replies: 15
Views: 501

Re: MODE 7 on RISC OS BBC Emulator 6502em

That probably suggests that !6502Em is working properly. I'm not sure what happens on a real Beeb if you issue COLOUR commands in Mode 7, either it issues the VDU sequence but nothing happens, or it suppresses the VDU sequence because it's in Mode 7. Either way, as danielj says, COLOUR should not wo...
by jms2
Wed Jan 24, 2018 6:46 pm
Forum: hardware
Topic: AP6 curious behaviour
Replies: 15
Views: 493

AP6 curious behaviour

I've been playing with the new AP5 interface, which allows me to use BeebSCSI, PiTubeDirect and a mouse with my Electron. Now that a few initial setup glitches have been ironed out, everything works fine - which is an incredible testament to the quality of these designs and to the underlying machine...
by jms2
Wed Jan 24, 2018 6:20 pm
Forum: hardware
Topic: P.R.E.S. AP5 - Original and Re-Design
Replies: 258
Views: 17470

Re: P.R.E.S. AP5 - Original and Re-Design

Now fixed - I installed the "V2.1" rom which is exactly the same as the Beeb one except patched for Elk addresses. The mouse now works fine, as do the demos :D AMX Art doesn't work as such, but I see that its load address is &1900, and therefore it doesn't co-exist nicely with ADFS. Ea...
by jms2
Tue Jan 23, 2018 11:13 pm
Forum: emulators
Topic: MODE 7 on RISC OS BBC Emulator 6502em
Replies: 15
Views: 501

Re: MODE 7 on RISC OS BBC Emulator 6502em

This doesn't look like an MDF issue to me. It looks instead like the underlying version of Risc OS doesn't provide mode 7.

Try doing *basic then MODE7 from Risc OS. Can you get Teletext colours to work?
by jms2
Sun Jan 21, 2018 5:26 pm
Forum: hardware
Topic: P.R.E.S. AP5 - Original and Re-Design
Replies: 258
Views: 17470

Re: P.R.E.S. AP5 - Original and Re-Design

I have tested the Beeb compatible user port with my AMX mouse and the hacked version of AMX Art that the genius that is Mr Barr did for me a few years back and that works fine too. I've now got to this point as well, and have copied the contents of the Elk AMX Art disc onto the BeebSCSI HD along wi...
by jms2
Sun Jan 21, 2018 9:48 am
Forum: off-topic
Topic: disk images: graphical images of data layout on disk
Replies: 9
Views: 414

Re: disk images: graphical images of data layout on disk

Interesting and pretty! I like it.

Perhaps it's an illusion, but there doesn't look to be anything like enough colour variations to represent the number of bits that would be on a disk. That said, how much capacity is there on a c64 disk?