As far as the DIP 40 version of board, let me see if I still have those files. I'm not sure how far along I got with the actual trace layouts.

Daryl


Thanks, Daryl. That would be great. I think that the soldering process would be more accessible with the DIP40 65816...
Ahem... is it bad ...

Thanks for all these ideas, it surely is cleaner to use defined behavior than to rely on undocumented features. I hadn't thought at using cycle differences in R/M/W absolute indexed instructions... that is interesting too, but only if a VIA is present (for the delay measurement). So the indirect JMP ...

Hello there, I'm wondering if there's a "standard" or usual way to detect which 6502 processor variant is running the program...

I was going to use code $EB which is an undocumented SBC #imm on the NMos 6502, an undocumented NOP on the CMos type, and XBA on the 65802/65816...

Any handy alternative ...

Hello Daryl, here are a few opinions that were raised on the newsgroups:
- someone wondered if the PCB could be done with 2 layers only (even if this would need some patches), that would surely lower the price...
- as the module is very small, someone else proposed to group several modules on the ...

That the R/W is (L) does not mean that the 6502 start outputting data as well at the same time.

I just realised that when reading the thread about multi-processing: the old Commodore IEEE drives use two 650x processors, one running on the inversed clock of the other.


Yep, the data lines of the ...

This is because some 6502 systems use the first half of the Phi2 clock (video display), so the module should not conflict with this use.

Best regards,

Fabrice

Oh my god, I've been away of this forum for such a long time...

Count me in for two boards, and expect to have a few others from other Oric users: I'm going to post an announce in comp.sys.oric.
Shouldn't we do the same in all the 6502-based computers newsgroups ?
I'm sure we would get a lot of ...

Are they 74LS or 74HC? I'll use whatever the group decides is best. If possible, I'll make it optionable for both.


I have used 74LS from the beginning but lately I've found that the Phi0 clock on my system is a rather neat signal compatible with CMOS levels...
So I could have gone with 74HC ...

If you're crazy enough to want to emulate that curve, you could put a resistor in series with the +5V supply. But if you want it to work... :-)

Ok, I'm not that crazy :-)

Hey, I am now using 4 inverters before the AND gate, and IT WORKS GREAT !!
I mean, it works with all the memory speeds I ...

I have borrowed a scope and will try measuring the Phi2-Phi0 time difference, but I'm not a pro, so it would be nice someone else does experiments too...


Here it is, sorry I had to copy by hand what I was seeing on the screen...
I would say that we have a very good replacement for a 65C02 ...

PS: here is an example of what my new 65802 generator is able to generate:
http://oric.free.fr/COMPILERS/test1.txt


I've improved my 65802 generator again, it now uses the D register to implement "shifting registers" somewhat like the Sparc architecture...
Have a look at the small examples above ...

Let me know how your experiment comes out.

Daryl


Ok, I have added a HCT08 to my module in order to generate Phi2 like you. It works "better"...
I mean, on my system, it works when I have 150ns DRAMs.
It still does not work completely when I use 70 or 80ns DRAMs, but it is better than the two ...

If anyone else would like to try, you can download the ExpressPCB schematic file from here:
http://65c02.tripod.com/conv.html
Daryl


I'm going to try your Phi2 generation...
On my prototype board I used two inverters to derive Phi2 from Phi0, and I don't if this is related or not, but I have ...

also mention of one here:

http://www.npsnet.com/danf/cbm/cross-development.html

and even two, with WDC's own one, which I discovered when parsing this list (I thought they only had one for the W65C02). It is advertized here:

http://www.westerndesigncenter.com/comp816s.html

Ok, so my ...

First, I'll have to preface by saying that 6502.org has no real affiliation with WDC. We do have a relationship with them now, from ordering so many chips on the behalf of 6502.org visitors, however 6502.org remains a completely separate, non-profit entity. I managed to get better "distributor ...