Jim Blackson Pegasus, Inc.
blac...@flash.atc.olivetti.com
Quaderno and Quaderno/33 parallel/FDD port pin assignment
Legal Formalities
=================
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In other words, if you damage your Quaderno or Quaderno/33, that's your
tough luck! You've been warned.
Pin Assignment
==============
Both the Quaderno and Quaderno/33 use the JAE Tx20A-36R-D25F-A1LP
36-pin "mini" female connector as a combined printer/FDD port.
(The male half-pitch connector is part number Tx20A-36PH1-D2P1-D1.)
When looking into the connector, the pins are numbered as follows.
Odd pins on top, even pins on the bottom, ordered right-to-left.
-------------------------
\ 35 ..... 3 1 /
\ 36 ..... 4 2 /
--------------------
The pin assignments of Quaderno and Quaderno/33 are almost same. The
different pins are 20, 34, and 35. These pins are GND on the Quaderno.
They are used for FDD power on the Quaderno/33.
Half of the pins, 1 - 18, are used for the printer. The rest, 19-36,
are used for the FDD. If you want to make your own printer cable,
the column on the right shows the pin numbers for a 25-pin D-SUB
female connector (Note: pins 20 and 23 are no connection).
Half-pitch JAE connector D-SUB Printer connector
------------------------ -----------------------
1 STB 1
2 P_D0 (Printer Data) 2
3 P_D1 3
4 P_D2 4
5 P_D3 5
6 P_D4 6
7 P_D5 7
8 P_D6 8
9 P_D7 9
10 SP_ACK 10
11 SP_BUSY 11
12 PE 12
13 SLCT 13
14 AFD 14
15 ERR 15
16 INIT 16
17 SLIN 17
18 GND 18
19 GND 19
20 (no connection!)
20 VFDD (FDD power: Quaderno/33 only) 21
21 FDIDX
22 FDTK0
23 FDWP
24 FDRDD
25 FDCHG
26 FDDS1
27 FDMO1
28 FDWD
29 FDWE
30 reserved (make no connection)
31 FDHS
32 FDDIRC
33 FDSTEP
34 VFDD (FDD power: Quaderno/33 only) 22
23 (no connection!)
35 FDDINS (FDD power: Quaderno/33) 24
36 GND 25
Quaderno/33 FDD power
=====================
The specification for three pins were changed, to supply power to
the Quaderno/33 external floppy Disk Drive (FDD).
Pin 35, FDDINS-, is used to detect the type of FDD attached, and thus
controls whether the Quaderno/33's FDD power circuit is enabled.
If FDDINS- is low (connected to ground), the original Quaderno external
FDD is connected, so the VFDD power circuit will _not_ be enabled.
This detection circuit is necessary because the original Quaderno FDD
connects pins 20 and 34 (and 35) to ground, shorting the VFDD lines!
However, the Quaderno/33 external FDD sets FDDINS- to no connect.
This appears as HI, enabling the VFDD power circuit. When the software
turns on the FDD power, power will flow through VFDD to the FDD.
VFDD is tied to the output from the AC adapter or the battery pack.
When using the AC adapter, VFDD typically is 12V DC, supporting a
current of about 0.7 Amperes, with a peak current of 1.0 Ampere.
When running from a fully-charged battery pack, VFDD is typically
7.2V DC, supporting a current of 0.7 Amperes, with a peak current
also of 1.0 Amperes.
** WARNING ***** WARNING ***** Quaderno/33 ***** WARNING ***** WARNING **
* *
* If you draw too much current, or short pins 20 and 34 to ground *
* without grounding pin 35 (effectively shorting VFDD to ground), *
* you might _damage_ your Quaderno/33, and also... *
* *
* 1) blow a fuse on the motherboard; *
* 2) cause a reset (the Quaderno was starved of power); *
* 3) cause a shut down (the Quaderno was starved of power); *
* *
*********** WARNING ***** WARNING ***** WARNING ***** WARNING ***********
That's all folks!