Newsgroup: it.comp.retrocomputing
Titolo: pin scsi 2,5"

Per tutti quelli che potrebbero entrare in possesso di un hd scsi da
2,5" e avessero bisogno di autocostruire un flat da uno ide 44 poli,
ecco qui...
... sembra molto liscia, date un'occhiata:
40 pin SCSI Connector 
                    (J1)                       (J2)
   _______________________________________    _______
  |. . . . . . . . . . . . . . . . . . . .|  |. . . .| 
  |. . . . . . . . . . . . . . . . . . . .|  |. . . .| 
   ---------------------------------------    -------
 39 37                                 3 1    7 5 3 1 
 40 38                                 4 2    8 6 4 2
Cabling 
The maximum cable length from the host system to the drive is limited to
6
inches with external 1 K-ohm pull up resistors. 
The cable length can be extended if the appropriate termination
resistors are
attached to the interface lines. The maximum cable length is determined
by
the electrical parameters of the interface. 
Driver/receiver 
The drives support single ended drivers and receivers. 
Signal definitions 
The J1 pin assignments for interface signals: 
_______________________________________
Pin  Signal name   Pin  Signal name
_______________________________________
01        +5V         02        +5V
_______________________________________
03        RET         04        RET
_______________________________________
05        GND         06        DB0
_______________________________________
07        GND         08        DB1
_______________________________________
09        GND         10        DB2
_______________________________________
11        GND         12        DB3
_______________________________________
13        GND         14        DB4
_______________________________________
15        GND         16        DB5
_______________________________________
17        KEY         18        DB6
_______________________________________
19        GND         20        DB7
_______________________________________
21        GND         22       PARITY
_______________________________________
23        GND         24      TERM PWR
_______________________________________
25       -ATTN        26       -BSY
_______________________________________
27        GND         28       -ACK
_______________________________________
29       -RST         30       -MSG
_______________________________________
31        GND         32       -SEL
_______________________________________
33       -I/O         34       -C/D
_______________________________________
35        GND         36       -REQ
_______________________________________
37        RET         38        RET
_______________________________________
39        +5V         40        +5V
_______________________________________
The J2 pin assignments: 
_______________________________________
Pin  Signal name   Pin  Signal name
_______________________________________
1    (Unused)        2    -No Spin Up
_______________________________________
3     -INDEX         4     (Unused)
_______________________________________
5      -ID1          6       -ID2
_______________________________________
7      -ID4          8       -LED
_______________________________________
Note: If pin 2 is grounded the drive will not spin up at power on. The
drive
must be started with a start stop unit command. 
Signal line descriptions 
BSY 
BUSY indicates that the bus is in use 
SEL 
SELECT is used by an Initiator to select a Target or by a Target to
re-select an Initiator 
C/D 
CONTROL DATA indicates whether control (1) or data (0) information
is on the bus 
I/O 
INPUT/OUTPUT indicates whether the data on the bus is an input (1)
to the Initiator or an output (0) to the Target. This line is also used
to
differentiate between SELECTION phase (0) and RE-SELECTION
phase (1) 
MSG 
MESSAGE is driven by Target and indicates a message phase 
REQ 
REQUEST is driven by Target and indicates a request for a REQ/ACK
data transfer handshake 
ACK 
ACKNOWLEDGE is driven by the Initiator and indicates an
acknowledgement of a REQ/ACK data transfer handshake 
ATN 
ATTENTION is driven by an Initiator to inform a Target that the
Initiator
has a message ready 
RST 
RSET clears all SCSI devices from the bus and resets them 
Note: The target will not drive this line 
DB(n) 
8 data bits are used to transfer data over the bus. DB(7) is the most
significant 
DB(P) 
PARITY bit associated with DB(7-0). Data parity is odd 
ID(n) 
These signal pins are used to set the drive address 
INDEX 
The signal is just for reference, and the function is not specified 
LED 
The signal is just for reference, and the function is not specified 
---
Che ve ne pare? Secondo me basta un flat da 44 segato a dovere nel punto
giusto, due flat, insomma... forse un filo volante o due.
Ciao

Per tutti quelli che potrebbero entrare in possesso di un hd scsi da 2,5"
Penso che siano uno dei componenti piu' rognosi da trovare in
assoluto. Credo che il valore di un portatile 
p.es
. Apple usato con
dentro uno di quei dischi, sia ormai molto inferiore al solo costo del
disco nuovo, se riuscite a trovarlo.
Ciao,
 P.
+++ Boing Boom Tschak

 disco nuovo, se riuscite a trovarlo.
Gonzaga. Ho detto tutto... :-)
320 mb, apple (ibm). Funzionante? Mah... ;-)
La mia voyager aspetta ansiosa, anche se per giochicchiare con solaris
va a pelo.
Ciao