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Re: Sider/ SASI Info
The Sider terminator info I posted was incorrect. This has the correct info.
-Paul
"Paul Grammens" <grammens@svn.net> wrote in message
veevkoihm59815@corp.supernews.com">news:veevkoihm59815@corp.supernews.com...
> I'm putting together some info on Sider hard disks for the Apple II.
> Seems like the cables and terminators are commonly missing, so here is the
> info needed to make your own cable from the Xebec interface card to the
rear
> panel, and the terminator which attaches to the Sider drive.
>
> I found most of this on the net, and took apart my terminator to
> reverse-engineer it.
> The only piece of info I'm missing is the DB37 to DB37 cable that goes
from
> the rear panel of the Apple II to the Sider drive. Comparing the
terminator
> to the ribbon cable, it does not appear that it is a straight-thru cable.
>
> If anyone has anything to add to this, please post it.
> -Paul
>
>
>
> Materials: SCSI ribbon cable with header, 50 conductor. DB-37 female
> connector.
>
> 37 pin 2x25 pin
> D-Sub header
>
> 1 -> 1
> 2 -> 3
> 3 -> 5
> 4 -> 7
> 5 -> 9
> 6 -> 11
> 7 -> 13
> 8 -> 15
> 9 -> 17
> 10 -> 19
> 11 -> 34
> 12 -> 36
> 13 -> 38
> 14 -> 40
> 15 -> 42
> 16 -> 44
> 17 -> 46
> 18 -> 48
> 19 -> 50
> 20 -> 2
> 21 -> 4
> 22 -> 6
> 23 -> 8
> 24 -> 10
> 25 -> 12
> 26 -> 14
> 27 -> 16
> 28 -> 18
> 29 -> 20
> 30 -> 35
> 31 -> 37
> 32 -> 39
> 33 -> 41
> 34 -> 43
> 35 -> 45
> 36 -> 47
> 37 -> 49
>
> Source: Sider Fixed Disk Drive Subsystem User's Guide 106109-01 Rev. D
>
> Also note that the drive needs a terminator plug on one of the two
> ports on the back of the external drive. I tried, and I can't get my
> drive to work without one.
> ******************************************
Sider Terminator construction:
The terminator has eleven outputs. Each output is connected to a two
resistor voltage divider. The eleven voltage dividers are connected
in parallel between 18 ground pins and one pin with +5V.
Materials:
Male DB37 connector.
Eleven 330 Ohm resistors
Eleven 220 Ohm resistors
or a DIP resistor pack with these values.
220 ohm resistors, common pin is 29. I assume this has +5V.
The junction of each pair of resistors goes to one each of
pins 13, 14, 16, 20-27.
330 ohm resistors common pins are 1-10 and 30-37. I assume these are ground.
__________________________________________________________ Pin 29
| | | | | | | | | | |
| | | | | | | | | | |
/ / / / / / / / / / /
\ \ \ \ \ \ \ \ \ \ \ Eleven 220 Ohm
resistors
/ / / / / / / / / / /
\ \ \ \ \ \ \ \ \ \ \
| | | | | | | | | | |
| | | | | | | | | | |
0 0 0 0 0 0 0 0 0 0 0 Connect these points
to
| | | | | | | | | | | pins 13, 14, 16,
20-27.
| | | | | | | | | | |
/ / / / / / / / / / /
\ \ \ \ \ \ \ \ \ \ \ Eleven 330 Ohm
resistors
/ / / / / / / / / / /
\ \ \ \ \ \ \ \ \ \ \
| | | | | | | | | | |
| | | | | | | | | | |
---------------------------------------------------------- Pins 1-10 and
30-37 > *****************************************
> This is from an Atari Xebec interface, but seems to be the same as the
Apple
> II Xebec.
>
> Table 2-3. Standard SCSi/SASI Signals
> Direction Description Abbv Pin Notes
> both Data bit 0 -DB(0) 2
> both Data b~t 1 -DB(l) 4
> both Data bit 2 -DB(2) 6
> both Data b~t 3 -DB(3) 8
> both Data bit 14 -DB(14) 10
> both Data bit 5 -DB(5) 12
> both Data bit 6 -DB(6) 14
> both Data bit 7 -DB(7) 16
> both Parity bit -FAR 18 N/C -- not supported
> from MIO Attention -ATN 32 N/C -- not supported
> to MIO Bus Busy -BSY 36
> from MIO Acknowledge -ACK 38
> from MIO Bus Reset -RST 40
> to MIO Message phase -MSG 42 Connected, not supported
> from MIO Select Target -SEL 44
> to MIO Command or Data -CID 46
> to MIO Request Data -REQ 48
> to MIO Input or Output -I/O 50
>
>