16 Oct
2001
16 Oct
'01
1:40 a.m.
BUT... predating that was a "Macintosh Hard Disk
20" that was not scsi.
Rather is was some drive (don't know what kind, but MFM seems sensible
enough) that used a special adaptor board that enabled it to plug into
the disk drive port on a bunch of the older macs. It was all enclosed
(drive, power supply, adaptor board) in one nice zero footprint beige
case (back when beige meant brown, and not grey like "beige" computers of
today).
In spite of the now long-extant senility, I seem to recall that these
interfaces through the serial port, not the floppy port.
Regards,
-dq
16 Oct
16 Oct
3:39 a.m.
Definitely the floppy port. I have one sitting unused at my folks house
complete with a 4meg Mac Plus.
Sometimes I have to power cycle the whole thing to get it to boot, do
I'm thinking that the drive might be going bad.
Chad Fernandez
Michigan, USA
Douglas Quebbeman wrote:
In spite of the now long-extant senility, I seem to
recall that these
interfaces through the serial port, not the floppy port.
Regards,
-dq
5:08 a.m.
On Tue, 16 Oct 2001, Douglas Quebbeman wrote:
Nope, the Apple Macintosh Hard Disk 20 most certainly plugs into the
floppy port. The trick is, the floppy port is essentially a 500 kbit/sec
serial interface.
Supposedly the HD20 INIT contains code to patch the 512k ROMs to allow the
use of an 800k floppy disk drive, as well as the code to use the HD20
itself. I need to fix some cold solder joints in my 512k before I can do
any real testing of this, though.
ok
r.
BUT...
predating that was a "Macintosh Hard Disk 20" that was not scsi.
In spite of the now long-extant senility, I seem to recall that these
interfaces through the serial port, not the floppy port. 
6:52 a.m.
On Tue, Oct 16, 2001 at 09:40:49AM -0400, Douglas Quebbeman wrote:
Hmm, I was sure it was the floppy port (which I believe is a 25-pin
connector -- the same size as some serial connectors -- perhaps why you are
thinking of the serial port?).
-- Derek
BUT...
predating that was a "Macintosh Hard Disk 20" that was not scsi.
Rather is was some drive (don't know what kind, but MFM seems sensible
enough) that used a special adaptor board that enabled it to plug into
the disk drive port on a bunch of the older macs. It was all enclosed
(drive, power supply, adaptor board) in one nice zero footprint beige
case (back when beige meant brown, and not grey like "beige" computers of
today).
In spite of the now long-extant senility, I seem to recall that these
interfaces through the serial port, not the floppy port.
7:11 a.m.
On Tue, 16 Oct 2001, Derek Peschel wrote:
Hmm, I was sure it was the floppy port (which I
believe is a 25-pin
connector -- the same size as some serial connectors -- perhaps why you are
thinking of the serial port?).
Nope, it's a 19 pin D-sub, which makes it physically compatible with the
NeXT monochrome display connector. Don't plug a Macintosh floppy drive
into the NeXT though, unless you want to start a fire. (;
Tony, this is your cue to step in and tell us what it's actual designation
is, since it's clearly not a DA, a DB, DC, DD, or a DE.
ok
r.
9:32 a.m.
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9:53 a.m.
--- "r. 'bear' stricklin" <red(a)bears.org> wrote:
On Tue, 16 Oct 2001, Derek Peschel wrote:
Is this the voice of experience? Which lights up, the NeXT or the
floppy drive?
-ethan
__________________________________________________
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Hmm, I was sure it was the floppy port (which I
believe is a 25-pin
connector
Nope, it's a 19 pin D-sub, which makes it physically compatible with the
NeXT monochrome display connector. Don't plug a Macintosh floppy drive
into the NeXT though, unless you want to start a fire. (;
10:51 a.m.
On Tue, 16 Oct 2001, Ethan Dicks wrote:
Oh, good heavens, no. I can't imagine what anybody might think to
accomplish by doing so...
Nope, it's
a 19 pin D-sub, which makes it physically compatible with the
NeXT monochrome display connector. Don't plug a Macintosh floppy drive
into the NeXT though, unless you want to start a fire. (;
Is this the voice of experience? Which lights up, the NeXT or the floppy drive?
It'd be the NeXT, since the drive would short out (via signal ground) the
+12V rail, the -12V rail, the pixel clock, and one of the lower speed
digital output ports. I don't think it would be a very happy situation for
the NeXT, though the floppy drive could conceivably escape with minimal
damage.
Since I'm at it...
NeXT Monitor Macintosh External Disk Drive
------------ -----------------------------
1. +12 V Signal Ground
2. -12 V Signal Ground
3. Clock Signal Ground
4. Data Out Signal Ground
5. Data In -12 V
6. Power Switch + 5 V
7. NC +12 V
8. Vertical Sync +12 V
9. Horizontal Sync NC
10. Analogue Video PWM (motor speed control)
11. +12 V PH0 (command control line)
12. -12 V PH1 (command control line)
13. Signal Ground PH2 (command control line)
14. Signal Ground PH3 (command control line)
15. Signal Ground WRREQ/ (write request)
16. Signal Ground HDSEL (head select)
17. Signal Ground ENBL2/ (read line enable)
18. Signal Ground RD (read data)
19. Signal Ground WR (write data)
So obviously PWM has no meaning for systems which use the 1.4 MB
SuperDrive. On the Classic, this line was rerouted to the so-called
"analogue board", where it was used to implement the software brightness
control.
ok
r.
2:28 p.m.
r. 'bear' stricklin skrev:
On Tue, 16 Oct 2001, Derek Peschel wrote:
> Hmm, I was sure it was the floppy port (which I
believe is a 25-pin
> connector -- the same size as some serial connectors -- perhaps why you are
> thinking of the serial port?).
Nope, it's a 19 pin D-sub, which makes it
physically compatible with the
NeXT monochrome display connector. Don't plug a Macintosh floppy drive
into the NeXT though, unless you want to start a fire. (;
The Atari ST ACSI DMA connector is a D19 as well.
BTW, D19s are terribly expensive! I had to shell out eighty crowns just for
the connectors and the shells for my ACSI cable last week.
Oh, the Atari Falcon video connector is a D19, too.
Tony, this is your cue to step in and tell us what
it's actual designation
is, since it's clearly not a DA, a DB, DC, DD, or a DE.
Last time we discussed it, I think someone dismissed the D19 (and the D23) as
a pure bastard.
--
En ligne avec Thor 2.6a.
We have support for the PMAGC-B's on pmax right? That is a PixelVision based
card right? I see Bt 463, that chip looks bigger than the 21164! Just looking
at it makes me want to write an Xserver!
Chris Tribo, NetBSD/pmax
8472
days inactive
8472
days old
8 comments
7 participants
participants (7)
-
ard＠p850ug1.demon.co.uk -
dhquebbeman＠theestopinalgroup.com -
dpeschel＠eskimo.com -
erd_6502＠yahoo.com -
fernande＠internet1.net -
optimus＠canit.se -
red＠bears.org