Re: 68008 co-processor board complete working design available ...

[Jim Gilbert <brokerjim@gmail.com>]

On Dec 28, 3:47 pm, Patrick Schaefer <pa.schae...@web.de> wrote:
> Am 28.12.2010 20:15 schrieb Jim Gilbert:
>
> > And yes, I did REKEY and check all the sources for the Debugger,
> > Monitor and RAMDisk.
>
> Thank you very much, Jim! I really appreciate it.
>
> Best regards
> Patrick

I have carefully checked the rekeyed listings and added some new
comments, clarifications and corrections.
The listings uploaded have not seen an assembler, compiler or
interpretor in 23 years.

I think the next thing I may do is to either try to remake them on
either Ubuntu Linux or XP.
The makefile reflects FileNet's 4.3BSD installation on a VAX 785 a
long time ago.  I understand it well enough now to get it through the
GNU tools or similar ones.

In coming months I will probably bring it back to life either on an
Apple ][ from ebay or on a PC power suppy with a PC parallel port
driving a cable to the Apple backplane connector.  To do the PC
approach I would have to modify DBG68 to run on QBasic.

I am most puzzled to identify a destination here.  Even if I got it
working again and did minor upgrades (EEPROM for EPROM, 512K RAM
instead of 128K, a few LEDs) I would still have an execution
environment that is woefully small for anything except Con-tiki or
SK*DOS.  No Linux dialect will be happy with just 512K.
And the environment would have no EZ access to mass storage, network
or graphics.

The two easy answers would be to use the Apple II as a host processor
or a PC as a host.

And, if you really want a 68K coprocessor for an Apple ][ and don't
want the thrill of building one with your own hands the smart thing to
do would be to work on getting the free Coldfire V1 core into Carte
Blanche (which ought ought to have enough room for Yet Another CPU
core emulation).