Re: Burnable, patched Microvax-2000 SCSI-boot EPROM images?
On Mon, Sep 20, 2021 at 5:24 PM Dave Wade G4UGM via cctalk wrote: > Do you know what type of ROM/PROM is needed 4x 27512 (32-bit wide image) I have a MicroVAX 2000 but haven't managed to get that SCSI hack working myself. It's been many years since I last fiddled with it. -ethan
Kennett Classic Sept 25th - Only 5 days to go!
Reminder - The Kennett Classic Vintage Computing event is only 5 days away! Many have already pre-registered for the all day vintage computing workshop and there are still spaces for exhibitors available. After we break for dinner there will be a chip tunes show from 7PM - 11PM 115 S. Union St. Kennett Square, PA (across the street from the museum shop) 484 732 7041 What to do in Kennett Square? Here is a sampling of restaurants within walking distance of the event space - bring the family! https://www.kennettclassic.com/while-at-kennett-classic-food/ Hope to see you there! Bill kennettclassic.com
Re: Burnable, patched Microvax-2000 SCSI-boot EPROM images?
A web-page I found over the weekend said M27512-2, but right now i cannot find it. Several sources say 256KB PROM, and the photos show 4 EPROMs, which is consistent with 64Kx8-bit. I have to dash now, more in a few hours. On Monday, September 20, 2021, 02:24:51 PM PDT, wrote: Do you know what type of ROM/PROM is needed Dave > -Original Message- > From: cctalk On Behalf Of Jonathan Stone > via cctalk > Sent: 20 September 2021 20:02 > To: cctalk@classiccmp.org; port-...@netbsd.org > Subject: Burnable, patched Microvax-2000 SCSI-boot EPROM images? > > I recently rescued two Microvax-2000s but both have dead RD53s. Does > anyone have a ROMable image of the Microvax 2000/Vaxstation 2000 boot- > PROM patches from Wolfgang Moeller > at http://ftp.gwdg.de/pub/vms/pk2k/ ? I'm looking to install NetBSD, not > VMS and I don't have any VMS systems on which to run PATCH. Microvax > 2000 specs say it can sustain 3.3MB/s I/O, which has to be via the SCSI > interface. So a SCSI emulator should be significantly higher performance > than an MFM drive (either 30+ year old drive, or emulator). > > Web-searching shows a Sean O'Banion has burned the PROMs successfully; I > haven't yet found other names. > If someone is willing to burn at least one set of EPROMs for me, I'd pay for > the service (either ship EPROMS, or pay for them). > >
RE: Burnable, patched Microvax-2000 SCSI-boot EPROM images?
Do you know what type of ROM/PROM is needed Dave > -Original Message- > From: cctalk On Behalf Of Jonathan Stone > via cctalk > Sent: 20 September 2021 20:02 > To: cctalk@classiccmp.org; port-...@netbsd.org > Subject: Burnable, patched Microvax-2000 SCSI-boot EPROM images? > > I recently rescued two Microvax-2000s but both have dead RD53s. Does > anyone have a ROMable image of the Microvax 2000/Vaxstation 2000 boot- > PROM patches from Wolfgang Moeller > at http://ftp.gwdg.de/pub/vms/pk2k/ ? I'm looking to install NetBSD, not > VMS and I don't have any VMS systems on which to run PATCH. Microvax > 2000 specs say it can sustain 3.3MB/s I/O, which has to be via the SCSI > interface. So a SCSI emulator should be significantly higher performance > than an MFM drive (either 30+ year old drive, or emulator). > > Web-searching shows a Sean O'Banion has burned the PROMs successfully; I > haven't yet found other names. > If someone is willing to burn at least one set of EPROMs for me, I'd pay for > the service (either ship EPROMS, or pay for them). > >
Burnable, patched Microvax-2000 SCSI-boot EPROM images?
I recently rescued two Microvax-2000s but both have dead RD53s. Does anyone have a ROMable image of the Microvax 2000/Vaxstation 2000 boot-PROM patches from Wolfgang Moeller at http://ftp.gwdg.de/pub/vms/pk2k/ ? I'm looking to install NetBSD, not VMS and I don't have any VMS systems on which to run PATCH. Microvax 2000 specs say it can sustain 3.3MB/s I/O, which has to be via the SCSI interface. So a SCSI emulator should be significantly higher performance than an MFM drive (either 30+ year old drive, or emulator). Web-searching shows a Sean O'Banion has burned the PROMs successfully; I haven't yet found other names. If someone is willing to burn at least one set of EPROMs for me, I'd pay for the service (either ship EPROMS, or pay for them).
Re: Micropolis 1525 stuck heads
That is what fixed it, hair dryer blowing around the unit. I stayed away from the circuit boards and just kept moving to different places. I thought a head was sticking, but it finally started to move a bit so it might have been a really gummed bearing. Or #3 head was stuck and loosened, most of the errors are on that head. Running it through the MFM tool got all but 200 or so sectors on the first pass, most errors were on head 3 but tapered off after cyl 500. Seems like a normal copy of Accent, no special information so it might not be worth taking the world apart to get it working. Thanks everyone. Back to On 9/20/2021 12:17 AM, Jonathan Stone via cctalk wrote: I had suggested a hair-dryer, as recommended circa 20 years ago for drive "stiction" after disuse. It seems that worked. On Sunday, September 19, 2021, 08:58:57 PM PDT, Bill Degnan via cctalk wrote: I have simply opened and physically moved the disk counter clockwise a turn, in a clean dust-free place. Or try putting in an oven on warm for 3 minutes a side, all four sides to loosen the grease. Might sound crazy but these have worked for me before Bill On Sun, Sep 19, 2021, 10:18 PM Zane Healy via cctalk wrote: 20+ years ago, I remember people talking about disassembling these to fix the issue. I’ve never tried. Though I have one or two that might benefit from is. If the CLASSICCMP archives from ’97-2000 are online, I’d recommend running a search against them. Zane On Sep 19, 2021, at 3:58 PM, Chris Zach via cctalk < cctalk@classiccmp.org> wrote: Ok, so out of the basement came a Micrapolis 1325 (the old Dec RD53 disk) with what appears to be stuck heads. Rotor tries to move under power but can only take out slack. Will move backwards a bit. Is this stuck head, and what would be the best way to free it? The reason I'm asking is this disk had a SA1000 adapter mounted under it so I am pretty sure it was a PERQ disk. Which means data may be priceless. And of course it's stuck. Thoughts? CZ
