(Yup, the '816 looks more straightforward, and also easier, to design around so it can be run at up to its max. clock speed; "hacking" an '02 with external logic would likely impose limits on performance.)

And another possible solution might be to use one of the FPGA-type 6502 cores, adding the ...

Thanks for the correction - I had (clearly) jumped to the wrong conlusion about what was where.

The "stuff" I have is a review from the "Personal Computer News" magazine (of the early 80's) of (some of) the CBM-II computers; I shall dig it (and a scanner) out and PM you with the file sizes &c ...

I agree with Toshi that, as an off-the-shelf solution, the '816 is preferable to a MOS 6509 . But, Martin, you sound as if you're motivated by curiosity, and perhaps aren't concerned so much about the practicalities of actually building a system.

has anyone tried adding external logic to a ...

Out of curiosity (and with all the recent topics on tracking and replacing or enhancing 65xx opcodes), has anyone tried adding external logic to a (modern/WDC) 65C02 to turn it into something that looks and acts like a MOS 6509?

--Martin

For those who are unsure, the MOS 6509 has a pair of 4-bit ...

Thanks for the pointer - I'd seen it in passing before, and I'm bound to look it out at some point; as it stands, a (DOS-based) assembler and (the Windows version of) "BeebEm" are doing well, especially as "BeebEm" emulates the B, B+ and Master 128, along with several second processors :)

Makes ...

If you have a 32-bit Acorn machine (Risc PC, A5000, that sort of thing), you can use my patch for Basic V which allows it to assemble 6502 code instead of ARM code. You can find it here .

I use it myself (well, duh) to produce (and maintain) several BBC ROMs. Via 65Link (see same website) I can ...

Cheers - always good to see product shipped!
I don't remember seeing that forum before. It's brought me to the Amsterdam Compiler Kit , which merits more investigation.
Cheers
Ed


I came across it only recently, after finding StarDot (which, incidentally, has taken over the old "Stairway To Hell ...

I've updated the "MUTILS" Sideways ROM to v0.92, and have made it available in this Retro Software thread:

http://www.retrosoftware.co.uk/forum/vi ... f=73&t=710

--Martin

It was just the image that came to mind; I might yet do _something_ along these lines as a (first) electronics project - I'll let the forum know if I get anywhere with the idea.

--Martin

Neat design - and it's given me an idea (of sorts) :)

First, off on a slight tangent (an apologies to those who are already familiar with the following): Acorn produced various accessories for the Beeb in the form of its "cheese wedges" - plastic cases with the back-to-front profile, and about ...

Here's something a bit more on-topic: another "great" has passed on - John McCarthy, inventor of Lisp, and coiner of the phrase "Artificial Intelligence".

--Martin

From what I remember from a quick read of the docs, then yes - and has used some of the "spare" performance to improve accuracy.

--Martin

Did you try Altirra ? It's for Windows - I think it has a good technical foundation. The web page implies that it handles disk images.

Cheers
Ed

* I tried it on linux using WINE but it didn't work

Interesting - seems to work (under XP SP3), and also seems to have a wide range of options - can ...

Can anyone here suggest/recommend an emulator of the Atari XL/XE-type computers, preferably one that's (fairly) recent?

If any of these emulators can handle Atari floppy disc images, then even better

TIA,

--Martin

Hmm... I'm not sure my background is quite as "rich" as those that have already posted, nor do I have much electronics experience, but here goes...

I think I'm a few - but only a few! - years younger than the like of Garth and Ed: my first experience of computing was back in the early 80's - my ...