On Jul 16, 2014, at 3:51 PM, Dave G4UGM <dave.g4ugm at gmail.com> wrote:
I think a major issue is that as Vaxen are readily
(well I have two Vax
Stations so they can't me that uncommon) available, then there isn't the
same incentive as for other platforms. I also think that it would be
advantageous to have some kind of BUS implementation. One of the great
things about the VAX is the expansion bus....
Which one? Off the top of my head, I can think of:
- QBUS (easily emulated, but bus levels are a pain)
- Unibus (same)
- VAXBI (super-proprietary with little known documentation)
- XBI (I don't even know)
- SBI (is that even separate from VAXBI?)
If I were to make an FPGA implementation, I think I'd probably start
with an SoC of sorts, then add external bus addressing once hardware
was made. I already have it in mind to make a QBUS interface card,
but again, the round tuits are getting scarce around here these days.
- Dave