RE: [N8VEM: 7875] Re: 6502 Host Processor board

["Dan Werner" <dwe...@dpcpipe.com>]

I just posted DOS65-10162010.ZIP on the WIKI in the 6502 host processor
folder.   It is a working version of Richard Leary's DOS/65 operating
system ported for the upcoming 6502 host processor board.  The OS is
working well in this version, but there is still some work to do with
the utility programs, and I would like to convert the ehBasic
interpreter to run under the OS.   The DOS/65 instruction PDFs are
included in the archive, but, I still need to put together a "How-To"
document to get everything running on the N8VEM.

If anyone has built the 6502 adapter for the 6809 host IO board, let me
know and I can walk you through getting DOS/65 booted up.   It is
actually quite easy due to the fact that DOS/65 uses a CP/M compatible
file system.

It is my hope that by the time we get the PCBs done for the new
6809/6502/6802 Host Processor board, that we have a complete OS done for
each mode. 6809=CUBIX, 6502=DOS/65, and 6802=FLEX(I think. . .).
Hopefully shortly after the PCBs are done I should have stand alone
versions of the software done for use with the current 6809 IO board and
backplane.

Dan Werner





-----Original Message-----
From: n8...@googlegroups.com [mailto:n8...@googlegroups.com] On Behalf
Of Andrew Lynch
Sent: Sunday, September 19, 2010 1:21 PM
To: n8...@googlegroups.com
Subject: RE: [N8VEM: 7875] Re: 6502 Host Processor board

Hi Dan!  Thanks!  Great pictures and it's a wonderful display!

I made a folder on the N8VEM wiki for VCF Midwest 2010 pictures.

http://n8vem-sbc.pbworks.com/browse/#view=ViewFolder&param=VCF%2520Midwe
st%2
5202010

I hope this helps!  Thanks and have a nice day!

Andrew Lynch


> -----Original Message-----
> From: n8...@googlegroups.com [mailto:n8...@googlegroups.com] On Behalf
Of
> Dan Werner
> Sent: Sunday, September 19, 2010 1:33 PM
> To: n8...@googlegroups.com
> Subject: RE: [N8VEM: 7870] Re: 6502 Host Processor board
> 
> 
> 
> -----Original Message-----
> From: n8...@googlegroups.com [mailto:n8...@googlegroups.com] On Behalf
> Of Dan Werner
> Sent: Sunday, September 19, 2010 12:30 PM
> To: n8...@googlegroups.com
> Subject: RE: [N8VEM: 7868] Re: 6502 Host Processor board
> 
> Several of the files failed to upload, so I will attach the rest. --
Dan
> 
> -----Original Message-----
> From: n8...@googlegroups.com [mailto:n8...@googlegroups.com] On Behalf
> Of Dan Werner
> Sent: Sunday, September 19, 2010 12:26 PM
> To: n8...@googlegroups.com
> Subject: RE: [N8VEM: 7867] Re: 6502 Host Processor board
> 
> I just uploaded picts of the N8VEM VCF-MW display -- Dan
> 
> -----Original Message-----
> From: n8...@googlegroups.com [mailto:n8...@googlegroups.com] On Behalf
> Of Andrew Lynch
> Sent: Sunday, September 19, 2010 7:13 AM
> To: n8...@googlegroups.com
> Subject: RE: [N8VEM: 7863] Re: 6502 Host Processor board
> 
> Hi Dan!  Wow!  That's this weekend?  That's great!  Please take some
> pictures and post so we can see what's happening!  Good luck and let
me
> know if you need anything!
> 
> Thanks and have a nice day!
> 
> Andrew Lynch
> 
> > -----Original Message-----
> > From: n8...@googlegroups.com [mailto:n8...@googlegroups.com] On
Behalf
> Of
> > Dan Werner
> > Sent: Saturday, September 18, 2010 7:26 PM
> > To: n8...@googlegroups.com
> > Subject: RE: [N8VEM: 7860] Re: 6502 Host Processor board
> >
> > Cool!   I am up at VCF-MW today (showing off N8VEM stuff, picts to
> > follow),  but, I can review this tomorrow.
> >
> > Dan
> >
> >
> >
> > -----Original Message-----
> > From: n8...@googlegroups.com [mailto:n8...@googlegroups.com] On
Behalf
> 
> > Of Andrew Lynch
> > Sent: Saturday, September 18, 2010 4:27 PM
> > To: n8...@googlegroups.com
> > Subject: RE: [N8VEM: 7857] Re: 6502 Host Processor board
> >
> > Hi Dan!  Thanks!  Wow!  It has been a while since we've discussed
the
> > 6809/6502 host processor board.  Since the ECB backplane and ECB
> > extended backplane are out for comment and are close to done, I
think,
> 
> > maybe it is time to dust off this project?
> >
> > I updated the schematic and it is attached.  Please review it and
send
> 
> > me any comments.  There is a spare inverter available and plenty of
> room
> > on the PCB for more jumpers.  I was worried about the PCB layout
being
> 
> > too tight to add another 40 pin DIP but it turns out that is not a
> > problem.
> >
> > There is a PCB in trace routing right now working.  I will post when
> it
> > is decent enough to be usable.
> >
> > I don't really follow on the jumper for Q you mentioned earlier and
am
> 
> > going to need your input on what jumpers are needed for what
> processors.
> > I have no idea so please let me know what you'd like.
> >
> > Thanks and have a nice day!
> >
> > Andrew Lynch
> >
> > > -----Original Message-----
> > > From: n8...@googlegroups.com [mailto:n8...@googlegroups.com] On
> Behalf
> >
> > > Of Dan Werner
> > > Sent: Saturday, August 14, 2010 10:13 AM
> > > To: n8...@googlegroups.com
> > > Subject: RE: [N8VEM: 7636] Re: 6502 Host Processor board
> > >
> > > I know originally the there was a "6500" produced by MOS that was
> > > supposed to be pin compatible with the 6800, so another adaptor
may
> be
> >
> > > very possible. I do not think there would be enough room on the
6809
> 
> > > card to add another socket for the 6800 (If Andrew decides to add
> one
> > > for the 6502), but perhaps with some creative use of jumpers it
may
> be
> >
> > > possible?
> > >
> > > It looks like your analysis of the pin signals is correct, except
> for
> > > "MR", it needs to be driven off of the clock through an inverter.
> > >
> > > It looks like ABRA electronics has the 6802 chips at a reasonable
> > > cost, so I will try to get my hands on one and see if I can get it
> to
> > work.
> > >
> > > Andrew, do you think we will have the board space if the
differences
> > > (6508 -- 6802) were facilitated with jumpers?  We would also need
> > > another 74LS14 to drive "MR".
> > >
> > > Dan
> > >
> > >
> > > -----Original Message-----
> > > From: n8...@googlegroups.com [mailto:n8...@googlegroups.com] On
> Behalf
> >
> > > Of vk5dg
> > > Sent: Saturday, August 14, 2010 7:44 AM
> > > To: N8VEM
> > > Subject: [N8VEM: 7634] Re: 6502 Host Processor board
> > >
> > > Hello Dan and others,
> > >
> > > Perusing through an old book of articles from the mid 70's, there
> was
> > > one discussing the up and coming  6502 vs the 6800.  Further
> research
> > > showed the 6800 needed an external clock chip but the 6802 had its
> own
> >
> > > oscillator.  I downloaded datasheets on the
> > > 6802 and 6502 to see if there is a simple way to make the adaptor
a
> > > little more versatile by having a third processor option.  Here's
a
> > > quick hardware comparison:
> > > 31 pins out of the 40 are the same function - address, data,
> > > interrupts, R/W and power.
> > > Of the other 9 there are some similarities
> > > PIN   6502    6802
> > > 2       RDY    !HALT   similar in function
> > > 3       PH1     MR       PH1 not connected on 6502 adaptor, Memory
> > > Ready should be tied high
> > > 5       N/C     VMA     Valid Memory Address (more research needed
> on
> > > this one)
> > > 7       SYNC  BA       SYNC not connected on 6502, Bus Available
is
> > > odd since the 6802 address lines can't be tri-stated
> > > 35     N/C      Vcc standby used for 6802's on chip ram, tie high
> > > 36     N/C      RE       6802 on chip ram enable, tie low to
disable
> > > 37     PH0     E          6502 clock input, 6802 system clock
output
> > > 38     S.O.     XTAL    6802 input should be grounded when using
an
> > > external clock
> > > 39     PH2     EXTAL  6502 clock output, 6802 clock input
> > > So as I understand it, pins 2 and 38 would need no modification.
> Pins
> > > 3 and 35 should be at 5v, pin 36 to 0v. Pins 37 and 39 need
swapping
> 
> > > (maybe with a set of jumpers).  Pins 5 and 7 are outputs that may
or
> 
> > > may not be needed.
> > >
> > > Can any 6802 gurus out there add to this idea?  I started off with
> > > commodore vic-20 and 64 many years ago but haven't had anything to
> do
> > > with 6800 systems.
> > >
> > > Regards
> > >
> > > David
> > >
> > > --
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