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CJE have them although not cheap: http://www.cjemicros.co.uk/micros/indiv ... 3010PSUTR1

Might be worth asking them if they'll do a deal or have any junked A3010/A3020 PCBs that you can salvage the transformer from...

I've had a good look through my parts boxes but unfortunately can't find any of these. I'm pretty sure I had some so I've either used them (or given them away at some point) or they are packed away somewhere.

I'll keep an eye out for them in case they turn up.

Coming back to this afternoon some time. I suppose you can combine rom and ram with some address decoding on a single board to get page at E00 and not load ADFS or DFS in SW RAM each time you boot? Also B+ sockets being configurable as 32k you could have both ADFS and DFS on a single plugin board I...

I repaired an R260 where battery gunk had caused lots of the tracks to be damaged. Having a working A540 board helped as I could find out which tracks were broken and where they were supposed to go. So, it might help to have the two boards side by side and compare tracks in the affected areas with a...

I remember playing this game on a Coleco emulator (possibly on my RiscPC)! I once thought about porting it to the Einstein as it's quite similar to the Coleco. I think it would look pretty good as a mode 2 game on the Beeb as it has large, colourful graphics. The sprites are pretty big by Beeb stand...

BeebMaster wrote: ↑

Thu Jan 14, 2021 5:50 pm

I think Chris Whytehead must be the only person who has one. Interestingly, the box the drive came in originated at Cumana, I've only just made the connection despite having purchased it 15 years ago this coming Saturday!

I guess it must be at the Centre for Computing History now then?

Shame, I would really have liked to get it going. I wonder if the person who sold me the drive had the Cumana board as well. There are some schematics here but I don't know how complete they are. It does seem like an interesting board - I have a Casper 68000 co-pro but there's not a lot of software...

Just tried it in BeebEm again. I used the debugger to break while it was hanging on the *OS9 call and it was stuck in this loop: 812E LDA &2400 8131 BEQ &812E From somewhere (probably on here :D ), I have a file called OSROM9.ASM which claims to be the assembler source code listing for the &...

I ripped out that ROM image and fired it up in BeebEm. It gives the expected help message and implements *OS9 but then, unsurprisingly, hangs as I guess it waits for the co-pro board to respond.

This is great - thanks for taking the effort to preserve it. I'll be trying to use it with the Cumana 68008 2nd processor Looks like that it what it's from - there appears to be a 6502 Beeb paged ROM image starting at 0x19700 in the latest dump that says: "68008 on the BBC Version 2.2 (C) Snowt...

An extra 16K of RAM and 16 proper colours would have made it a much better computer, but the Beeb was never going to compete on the games front because it was too expensive. And more memory wouldn't have fixed the lack of sprites/scrolling hardware. Agree on cost but not sure about the lack of spri...

It's 1.03 - I'll fix the help text.

You'll need to pad the SpectROM image to be 16KB and then duplicate that.

Let me know if you're unable to do this and I'll post a version padded to 16KB here.

Have a look here . The TORCH.TXT file gives info on which ROMs go where. I don't think anyone has written a version that works with an SD card so it's possibly really floppy drives or Goteks only :( However, I think it only needs the ROMs to boot up (although it won't be much use without disk access...

and burned to a 27C512 eeprom placed on a bbc master rom cart Have you been able to get other ROMs working using this configuration? What sort of cartridge are you using? I'm not sure any of the ones I have are designed for 64KB chips. As JGH suggests, it might be worth duplicating the image at 16K...

I use a custom VDU handler (OSWRCH) and use certain bytes to represent different types of transfer (e.g. single byte, double byte, multiple bytes, whole row, sound data). On entry my custom VDU handler looks for the special characters in A and then, depending on the type of transfer, reads additiona...

Picked this up on tape from eBay last month. I knew there'd been talk about imaging it before so thought I'd grab it. I'll try to make a uef at some point but here's a quick SSD I made on my M128/DC. I think it's copied over correctly but haven't given it a thorough test. CHAIN"GO" for the...

Thanks all - really enjoyed it even though I'd promised to do some DIY so was only able to make a few talks.

If you're loading it into sideways RAM, here's a version that uses sideways RAM for storage rather than main memory:

Yes with the OS RAM + 1 bank of sideways RAM you can have 79KB of RAM in use without changing any paging registers (or 63KB if you keep the OS paged in for code) - on a otherwise standard model B. This would make porting games from other 8-bit micros so much easier as they often have more available...

I'm hoping to be there for a few of the sessions.

Thanks,

Rob

How would it differ from the 64K B+? extra RAM as sideways RAM instead of shadow ram, like the 128K B+? Yes - 16KB sideways RAM and then possibly 16KB RAM overlaying to OS ROM too instead of the shadow RAM. As Ed points out in his thread, this would give (almost) a flat 64KB of RAM for those wantin...

I really like this idea - as I've posted elsewhere on here recently, I think a scheme like this would have been better than the shadow RAM used in the B+ (even though I've always thought that was a clever idea). I wonder how much something like this would have added to the price in 1984/1985? It wou...

I may have one as I bought a job lot of M128 chips a few years ago.

I'll have a look through my spare parts box and get back to you.

I put the compiler files into an Acorn SSD image and then transferred them to the CP/M system disk using the instructions here . I'm no CP/M expert but I believe it has standard routines/entry points to handle things like input, output and disk operations so the compiler will be hooking into these r...

After a bit of work, I managed to get the HiSoft C compiler files from here onto an Acorn Z80 co-pro system disk. The C syntax is a bit strange but, following the example in the manual, I was able to get it to build and run a simple "Hello World" program. I strongly suspect that it'll also...

Just did some digging and the manual here says the CP/M version will run under CP/M on the Einstein (and other Z80 machines running CP/M - so probably the Beeb with Z80 co-pro too).

I have the 80 column card too but haven't used it.

Is the Einstein version different to the CP/M version of the HiSoft C compiler? The CP/M version seems to be here: https://cpcrulez.fr/applications_coding ... mpiler.htm

Thanks Jeff - glad it arrived safely and thanks for letting me know. Happy New Year to you too (and to everyone else on Stardot).

kilowatt wrote: ↑

Thu Dec 31, 2020 1:49 pm

If available, I would like to order one of your VideoNuLA boards.
I am unable to PM you.

PM sent.