22 Nov
2015
22 Nov
'15
10:29 p.m.
I'm looking for a modern storage (ie. anywhere from 100mb to "huge") device
for an 11/44. I think I have seen a few hobbyist projects that were flash
based, I thought I saw one that was an IDE interface....
Long story short I've satisfied the purist in me by putting an RL02 on the
machine, but that's just not enough storage for that particular system.
Anyone know of a good project to add some modern storage to get me over the
available storage on the RL02?
J
22 Nov
22 Nov
10:43 p.m.
On Nov 22, 2015, at 7:29 PM, Jay West <jwest at
classiccmp.org> wrote:
I'm looking for a modern storage (ie. anywhere from 100mb to "huge")
device
for an 11/44. I think I have seen a few hobbyist projects that were flash
based, I thought I saw one that was an IDE interface....
Long story short I've satisfied the purist in me by putting an RL02 on the
machine, but that's just not enough storage for that particular system.
Anyone know of a good project to add some modern storage to get me over the
available storage on the RL02?
What about some sort of SCSI-to-IDE adapter? Though I simply have a couple DEC SCSI
drives for my /44, in addition to its pair of RL02?s.
Zane
10:45 p.m.
Alas... I have no scsi cards for any of my dec gear. I was hoping for a CF based device
that plugs straight into the unibus... or similar solution...
J
11:18 p.m.
It's on my (long) list of projects. I first have to finish the MEM11.
That will have RF11/RS11s as part of the emulated devices.
I'm planning on using the J1 and associated infrastructure for my other
projects (which is why I've spent so much time getting them "right").
TTFN - Guy
On 11/22/15 7:45 PM, Jay West wrote:
Alas... I have no scsi cards for any of my dec gear. I
was hoping for a CF based device that plugs straight into the unibus... or similar
solution...
J
23 Nov
23 Nov
12:08 a.m.
Plus one here. With all the SMD controllers languishing out there due to
dead drives, you'd think there should be a way to make a cheap little glue
board that could interface to a modern HDA, with the IDE bits ripped out,
right?
On Sun, Nov 22, 2015 at 11:18 PM, Guy Sotomayor <ggs at shiresoft.com> wrote:
It's on my (long) list of projects. I first have
to finish the MEM11.
That will have RF11/RS11s as part of the emulated devices.
I'm planning on using the J1 and associated infrastructure for my other
projects (which is why I've spent so much time getting them "right").
TTFN - Guy
On 11/22/15 7:45 PM, Jay West wrote:
Alas... I have no scsi cards for any of my dec
gear. I was hoping for a
CF based device that plugs straight into the unibus... or similar
solution...
J
1:03 a.m.
Uh, no. Interfacing to an HDA (especially a modern one) is not for the faint of heart.
The drive controller is usually a custom (to the drive family) ASIC. In many cases the
firmware and drive parameters are stored on the drive media itself. The read/write
amplifiers are usually tuned to the specific heads and drive data rate (again those are
contained in the custom ASIC).
Creating an SMD (or ESDI) drive emulator doesn't look to be all that difficult since
the data is all after the clock recovery and is all digital. That is when writing, the
controller provides the clock (can't remember if the drive provides a reference
clock). On reading, the drive provides the clock. In those cases, the bits are bits and
you don't have to worry about over sampling and jitter. Plus the interface to the
drive is reasonably high level in that the controller sends commands and gets responses.
TTFN - Guy
On Nov 22, 2015, at 9:08 PM, Jacob Ritorto
<jacob.ritorto at gmail.com> wrote:
Plus one here. With all the SMD controllers languishing out there due to
dead drives, you'd think there should be a way to make a cheap little glue
board that could interface to a modern HDA, with the IDE bits ripped out,
right?
> On Sun, Nov 22, 2015 at 11:18 PM, Guy Sotomayor <ggs at shiresoft.com> wrote:
>
> It's on my (long) list of projects. I first have to finish the MEM11.
> That will have RF11/RS11s as part of the emulated devices.
>
> I'm planning on using the J1 and associated infrastructure for my other
> projects (which is why I've spent so much time getting them "right").
>
> TTFN - Guy
>
>
>> On 11/22/15 7:45 PM, Jay West wrote:
>>
>> Alas... I have no scsi cards for any of my dec gear. I was hoping for a
>> CF based device that plugs straight into the unibus... or similar
>> solution...
>>
>> J
>>
>>
>>
>
6:31 a.m.
On 2015-11-23 04:29, Jay West wrote:
I'm looking for a modern storage (ie. anywhere
from 100mb to "huge") device
for an 11/44. I think I have seen a few hobbyist projects that were flash
based, I thought I saw one that was an IDE interface....
Long story short I've satisfied the purist in me by putting an RL02 on the
machine, but that's just not enough storage for that particular system.
Anyone know of a good project to add some modern storage to get me over the
available storage on the RL02?
I know there been a few projects/attempts at some IDE thing, but I dont
think I've ssen any that's been completed.
The (other) obvious answer in a SCSI-controller, but SCSI controllers
for Unibus are less common, and usually expensive.
And to make things "worse", you really would want something that
implements MSCP, as otherwise you need to emulate a specific disk
geometry and size. About the only controller that have dynamic size of
the disk is MSCP.
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
10:57 a.m.
-----Oorspronkelijk bericht-----
From: Jay West
Sent: Monday, November 23, 2015 4:29 AM
To: cctalk at classiccmp.org
Subject: flash (or ide) storage for unibus 11?
I'm looking for a modern storage (ie. anywhere
from 100mb to "huge")
device
for an 11/44. I think I have seen a few hobbyist projects that were flash
based, I thought I saw one that was an IDE interface....
Long story short I've satisfied the purist in me by putting an RL02 on the
machine, but that's just not enough storage for that particular system.
Anyone know of a good project to add some modern storage to get me over
the
available storage on the RL02?
Although it is not quite 100 MB, IIRC Pete McCollum made a simple
interface that mimics an RX01. It is a small dual-width card, and
needs additionally an M105 (address decode) and M7821 (interrupt)
single-width card. The dual-width card connects to the parallel port
of a PC. A program on the PC handles the transfers.
The nice thing of this design is that it uses the standard DX.sys
(or DXX.sys). No changes what-s-ever for RT11 (what I used). What I
have forgotten is that there was NO limit (or some higher value limit)
to the data stored in the files on the PC.
So, maybe not suitable for 100 MBs, but still a project that deserves
some attention (IMHO).
- Henk
3128
days inactive
3128
days old
7 comments
6 participants
participants (6)
-
bqt＠update.uu.se -
ggs＠shiresoft.com -
healyzh＠aracnet.com -
henk.gooijen＠hotmail.com -
jacob.ritorto＠gmail.com -
jwest＠classiccmp.org