26 Sep
2021
26 Sep
'21
10:34 a.m.
I just purchased an RK05 Controller for my PDP-8/E, does this emulator
work to emulate RK05 packs?? If it does then maybe I can use it as mass
storage until i can find an RK05 (or Plessey or Diablo clones) .
Thanks...
On 9/24/2021 3:19 PM, David Gesswein via cctalk wrote:
On Tue, Sep 21, 2021 at 12:15:12PM -0400, Paul Koning
wrote:
The MFM emulator can't transfer data faster than the 5 Mbit/second,
625k Byte/sec of the ST-506 standard.
Seek time isn't zero due to overhead in moving the data in the Beaglebone
to where the PRU processors can access it. Think its around 0.6ms/head. An
entire cylinder is transfered on each seek. Additional time if cylinder
was written to. Each track written needs to be moved also. Most ST-506
drives are slower. I'm faster than average seek for RD54 but it wins for
single track seek at 4ms with 15 heads.
On Sep
21, 2021, at 12:00 PM, Jonathan Stone via cctalk <cctalk at classiccmp.org> wrote:
The RD53s in both Microvax 2000s are dead. I'm reluctant to buy more 30+ year old
rotating media.
If I'm going to buy a disk emulator, I'd much prefer SCSI to MFM, for the obvious
performance reasons.
Emulators presumably act, performance wise, like SSDs. Given
that, an MFM emulator will significantly outperform a SCSI hard drive since it has no seek
delays.
David Gesswein's MFM emulator works impressively well and is inexpensive, too.