Search found 1696 matches

by Pernod
Mon Nov 18, 2019 9:16 pm
Forum: emulators
Topic: MAME: Click (and other large ROMs)
Replies: 100
Views: 5902

Re: MAME: Click (and other large ROMs)

I'm sure if you provided a slightly longer pulse it wouldn't matter - it just needs to be whatever the 6502 needs to recognise a valid interrupt. This 'seems' to be the problem, the E2P doesn't respond and transfer all bytes when transferring the OS to $F800, which would infer that the Electron is ...
by Pernod
Mon Nov 18, 2019 12:55 pm
Forum: emulators
Topic: MAME: Click (and other large ROMs)
Replies: 100
Views: 5902

Re: MAME: Click (and other large ROMs)

I'm taking another look at the E2P, and as this is a current topic elsewhere, hope someone can clarify a few things. My main sticking point is when and how long the IRQ line is pulsed. I know the IRQ line should be asserted when the Electron access $FCE5 (read or write) to tell the E2P to do somethi...
by Pernod
Tue Nov 12, 2019 8:17 pm
Forum: software: classic games
Topic: Elaborate Repton 1 Electron Cheat !
Replies: 10
Views: 426

Re: Elaborate Repton 1 Electron Cheat !

Snuggsy187 wrote:
Tue Nov 12, 2019 8:02 pm
Now, onto Repton 3......perhaps...... Matthew Atkinson, different programmer, definitely a different programming style !
I've known him since before Repton 3. He's in the Facebook group if you have any questions.
by Pernod
Tue Nov 12, 2019 5:13 pm
Forum: archive requests
Topic: PMS 64K Non-Volatile Ram Module
Replies: 9
Views: 236

Re: PMS 64K Non-Volatile Ram Module

KenLowe wrote:
Tue Nov 12, 2019 5:04 pm
I don't know anything about the unit, but from Micro User, Jan 1986:
Yep, had already seen that, it's the Z-modules that I haven't seen reviews of. This review of the 64K module also states that the ROS is installed on the module, and no mention of a ROM.
by Pernod
Tue Nov 12, 2019 4:55 pm
Forum: archive requests
Topic: PMS 64K Non-Volatile Ram Module
Replies: 9
Views: 236

Re: PMS 64K Non-Volatile Ram Module

That sticker on the 64k ram module says "*ROSON", which suggests to me that the Advanced Ram Operating System was intended for the 64k module. The ROM implements *ROS, not *ROSON. However it would make sense if it also worked with the Z-modules as well (given that they were bigger, and match the bi...
by Pernod
Tue Nov 12, 2019 11:39 am
Forum: archive requests
Topic: PMS 64K Non-Volatile Ram Module
Replies: 9
Views: 236

Re: PMS 64K Non-Volatile Ram Module

Another interesting advert from PMS, from Acorn User Apr.86: PMS-Z-NVRAM.png It mentions a PMS Z-range, which are different from the 64K NVRAM module, and come in a range of sizes from 64K upto 512K. There's no mention of software with these devices and also can't find any reviews. The attached ROM ...
by Pernod
Mon Nov 11, 2019 3:16 am
Forum: hardware
Topic: Morley RAMDisc Documentation?
Replies: 5
Views: 433

Re: Morley RAMDisc Documentation?

Looking at the ROM I see : FCC0 Low page address FCC1 only 0 and FF are written to it. When read it is anded with &7F and then checked for &3F &5F FCC2 High page address FCC3 only 0 and FF are written to it. When read it is anded with &7F and then checked for &3F &5F Anyone know anything more about...
by Pernod
Sun Nov 10, 2019 8:07 pm
Forum: for sale / freebies
Topic: Worth Taking a Look At
Replies: 2794
Views: 273633

Re: Worth Taking a Look At

Anyone know what this Elk expansion unit is? I'm not thinking of buying it, just intrigued. https://www.ebay.co.uk/itm/Vintage-Retro-1980s-80s-Acorn-Electron-Computer-DISK-INTERFACE-Untested/254380743183?hash=item3b3a461a0f:g:MKEAAOSwa0ddmbLH It's the Cumana Floppy Disk System, see http://chrisacor...
by Pernod
Sun Nov 10, 2019 6:38 pm
Forum: archive requests
Topic: Sacram by Seawell Automatic Control
Replies: 0
Views: 61

Sacram by Seawell Automatic Control

Never heard of this until I saw reviews in Micro User Vol.4 No.6 Aug.86 and Disk User Iss.2, haven't yet found any adverts. Briefly mentioned in Acorn User Mar.86: sacram.PNG It's a RAM unit connected to the 1MHz bus, providing 128K or upgraded to 256K. I'm specifically looking for the ROM that came...
by Pernod
Sat Nov 09, 2019 11:02 pm
Forum: archive requests
Topic: PMS 64K Non-Volatile Ram Module
Replies: 9
Views: 236

Re: PMS 64K Non-Volatile Ram Module

jms2 wrote:
Sat Nov 09, 2019 10:58 pm
There is one currently for sale on Ebay actually.
Bit pricey, especially untested and doesn't mention either the software or manual.
by Pernod
Sat Nov 09, 2019 10:22 pm
Forum: archive requests
Topic: PMS 64K Non-Volatile Ram Module
Replies: 9
Views: 236

PMS 64K Non-Volatile Ram Module

Anyone have the PMS 64K Non-Volatile Ram Module? Here's an advert: PMS 64K NV-RAM.jpg I'm specifically looking for the manual and the software that came with it. The hardware is probably very simple, 64K battery backed RAM, accessible via the paging register at &FCFF and read via JIM. There's one at...
by Pernod
Sat Nov 09, 2019 3:02 pm
Forum: emulators
Topic: Arculator v2.0 released!
Replies: 20
Views: 891

Re: Arculator v2.0 released!

Awesome =D>
by Pernod
Wed Nov 06, 2019 2:04 pm
Forum: bbcmicro.co.uk
Topic: Games with problems
Replies: 48
Views: 1924

Re: Games with problems

Again, not sure where this disc version came from as I believe Audiogenic did not release it on disc, unless they did and I simply never had that copy BITD. I also believe it was a tape only release. The version I transferred to disc required an E00 DFS, there were just too many files to move aroun...
by Pernod
Wed Nov 06, 2019 1:40 am
Forum: hardware
Topic: Electron internal mode 7 rom needed
Replies: 8
Views: 353

Re: Electron internal mode 7 rom needed

A couple of versions also at http://bbc.nvg.org/rom/unsorted/
by Pernod
Mon Nov 04, 2019 6:07 pm
Forum: software: classic games
Topic: Acornsoft Electron cartridges
Replies: 5
Views: 207

Re: Acornsoft Electron cartridges

All Acornsoft cartridges are pictured at http://www.stairwaytohell.com/roms/homepage.html
by Pernod
Sun Nov 03, 2019 7:29 pm
Forum: archive submissions
Topic: Watford Electronics 32K RAM
Replies: 0
Views: 141

Watford Electronics 32K RAM

There are currently versions 2.00 and 2.40 of this ROM available, for the 32k Shadow RAM board.

Here's the original 1.00!
0137.png
by Pernod
Sun Nov 03, 2019 4:55 pm
Forum: software: classic games
Topic: Choosing games for a retro-gaming session
Replies: 16
Views: 344

Re: Choosing games for a retro-gaming session

I'd recommend adding Thrust to your list.
by Pernod
Fri Nov 01, 2019 6:38 pm
Forum: archive submissions
Topic: WE Modem ROM image
Replies: 4
Views: 152

Re: WE Modem ROM image

marcusjambler wrote:
Fri Nov 01, 2019 6:31 pm
There's a big red WE sticker covering the whole top surface which I'm a little reluctant to disturb
Fair enough, the older 1.00 was only 8K so will trim this to match.
by Pernod
Fri Nov 01, 2019 6:19 pm
Forum: archive requests
Topic: Midi Track Performer v2
Replies: 6
Views: 247

Re: Midi Track Performer v2

courseddent wrote:
Fri Nov 01, 2019 11:00 am
Have the disk of it, but can't seem to copy.
Is the the disk damaged, or you think it's protected?
by Pernod
Fri Nov 01, 2019 6:14 pm
Forum: archive requests
Topic: Master Replay
Replies: 9
Views: 302

Re: Master Replay

RobC wrote:
Thu Oct 31, 2019 8:09 pm
I've dug out the Master Replay manual but, unfortunately, it doesn't contain any fitting instructions or technical details.
I'm sure I'll find something useful in there, so would still like to see it scanned.
by Pernod
Fri Nov 01, 2019 6:07 pm
Forum: archive submissions
Topic: WE Modem ROM image
Replies: 4
Views: 152

Re: WE Modem ROM image

Thanks for this. It's Watford's Prestel Terminal 1.10, I previously only had 1.00 so this is a new find.

Was it really a 16K ROM?
by Pernod
Fri Nov 01, 2019 11:32 am
Forum: emulators
Topic: ACCCON TST
Replies: 5
Views: 567

Re: ACCCON TST

jgharston wrote:
Thu Oct 31, 2019 6:18 pm
My *MDUMP command will page out the I/O area, and confirms that all three pages are paged out.
Thanks for the confirmation, and code details.
by Pernod
Thu Oct 31, 2019 1:17 pm
Forum: emulators
Topic: ACCCON TST
Replies: 5
Views: 567

Re: ACCCON TST

tom_seddon wrote:
Thu Oct 31, 2019 1:03 pm
MOS 3.50 has code in these pages.
I never noticed that before, but would suggest all 3 pages are paged out. Any idea what the code there does?
by Pernod
Thu Oct 31, 2019 12:42 pm
Forum: emulators
Topic: ACCCON TST
Replies: 5
Views: 567

ACCCON TST

The Master service manual isn't very clear on which IO is paged out when the ACCCON TST bit is set. A diagram suggests only page &FE is IO/ROM, and there's no other mention of the TST bit. I see b-em pages out pages &FC,&FD, &FE, which looks more likely as the MOS contains credits in these pages. Do...
by Pernod
Thu Oct 31, 2019 12:24 pm
Forum: archive requests
Topic: Master Replay
Replies: 9
Views: 302

Re: Master Replay

Even the "Vine Micros Master to BBC B Conversion Kit" and "Vine Micros Master OS Overlay Board"? No, the Replay stuff. I already emulate the Overlay board and the conversion kit info was useful to know that SHIFT-C performs the switch. The switch to OS1.2 must write something somewhere to tell the ...
by Pernod
Thu Oct 31, 2019 11:04 am
Forum: archive requests
Topic: Master Replay
Replies: 9
Views: 302

Re: Master Replay

RobC wrote:
Thu Oct 31, 2019 7:51 am
Sounds like you've made good progress. I've been a bit under the weather this week so haven't had time to dig out my manual yet but I've remembered that there's some documentation here.
That's all for the earlier BBC version, completely different implementation.
by Pernod
Wed Oct 30, 2019 6:59 pm
Forum: archive requests
Topic: Master Replay
Replies: 9
Views: 302

Re: Master Replay

Started trying to emulate this, it overlays the MOS (and a MOS bank 9-F, no idea which) when the button is pressed, which causes NMI. The new NMI vector in ROM jumps to &FF00 which then searches for the bank that has the ROM overlayed, and jumps into the ROM at &8A38. It then repeatedly reads &FFFB ...
by Pernod
Wed Oct 30, 2019 12:48 pm
Forum: hardware
Topic: What to try re-engineering next.....
Replies: 44
Views: 4327

Re: What to try re-engineering next.....

In my tracing of the 32K board there is a 74LS139 decodes $FE30 - $FE38 so has outputs at $FE30, $FE32, $FE34 and $FE36, but the $FE36 output has nothing connected to it. So I guess this option was only available on the 256 board. I agree that $FE36 isn't used on the 4M32. Did you determine how $FE...
by Pernod
Mon Oct 28, 2019 2:07 pm
Forum: upcoming and recent events & exhibitions
Topic: London Show / Sat 26th October 2019
Replies: 16
Views: 1113

Re: London Show / Sat 26th October 2019

Also found a Prisma EPROM image, which I'll upload soon / take to the show. Might be useful for the Prisma emulation project? And this time, I've got the PRISMA 3 up and running for hands on demo.. Yes please for the Prisma ROMs, we currently have v1.30 and v2.30 dumped so will be interesting to se...