23 Nov
2015
23 Nov
'15
9:55 a.m.
On 2015-11-23 18:11, Paul Koning wrote:
Indeed. But you have code like the stuff in simh, which will tell you
how it is supposed to work.
On Nov 23, 2015, at 10:10 AM, David Bridgham
<dab at froghouse.org> wrote:
...
However, once we get a prototype doing something interesting, we were
talking about looking around for people interested in helping out.
We'll do a couple disk controllers but if someone wants to add others,
great. Especially if someone wants to add MSCP. We're happy to skip
that one ourselves.
I can imagine. MSCP is a large effort. For a classic/straightforward programming interface,
the Massbus disks (RP04 and successors) are a good choice. That will take you just over
500 MB, if you emulate the layout of the RP07.
Unfortunately, support for the RP07 is lacking in most OSes. I don't
know about RSTS/E, but in RSX, there are some odd holes in there,
suggesting that they never used them much in real life. I did get it to
work, but I had to write my own formatting module for FMT, among other
things.
Otherwise it's the RM05 at 256 Meg, if I remember right. But all those
disks are also expected to expose the actual geometry of the disk. While
fairly straight forward, it do expose you to a rather low level
interface, where you need to do a lot of calculations all the time.
Johnny
--
Johnny Billquist || "I'm on a bus
|| on a psychedelic trip
email: bqt at softjar.se || Reading murder books
pdp is alive! || tryin' to stay hip" - B. Idol