5434Re: [midatlanticretro] Designing Vintage Hardware (was Altair 680 Basic - loading without papertape)
- May 4, 2007--- Dan <ragooman@...> wrote:
> MFM Emulation ?Well, pretty much any machine I think, although I'm
> That project sounds interesting, for which machine
> is it ?
targetting DEC hardware (VAXen and Professional 350
systems) initially where an RD5X drive would be
I'm hoping to be able to emulate a Micropolis 1325 at
a low enough level that it could support any
host/controller platform (that can use that particular
drive type/geometry etc). The drive emulation should
be transparent to the point where any low level format
can be overlaid on it by the controller or host.
Doing an emulation of an MFM drive would be useful for
a variety of reasons for hobbyists, not the least of
which is the cost of replacement drives. The MTTF of
the platters in these drives is 4 years so they are a
dying breed; plus, emulation would make it possible to
expose the low-level formatting used by the hardware
vendor, something that there's not a great deal of
documentation on so far as I can tell.
Of course talking about it is easier than actually
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