Table of Contents
Advertisement
IEEE·488 CONNECTORS
The IEEE·488 standard receptacles are
not
directly connectable to the PET edge connector; some of
these are shown in Table 7.5, and belong to the Cinch Series 57 or Champ Series (Amphenot). Also shown
are their matching plugs.
Connector
Identifier
Description
Manufacturer
Cinch
5710240
Solder-plug
Cinch
5720240
Solder-receptacle
Amp
552301-1
Insulation displacement plug
Amp
552305·1
Insulation displacement rec.,ptacle
Table 7.5. IEEE standard connectors
Commodore has available
a
1 meter fong 1£££-488 dual connector-PET edge connectOf, cable. Please
contact your local dealer or Commodore tor price and delivery.
PARALLEL USER PORT
(Connector J2)
The lines for this interface are brought out from the PET main logic-board to a 12 position, 24 contact
edge connector with a .156 inch spacing between contact centers. See Table 7.4 for suitable mating
connectors.
Keying slots are located between pins 1-2 and 10-11.
Table 3·1 shows the PET pin identification characters, the corresponding labels and their descriptions.
Note that the connections 1-12, the top line of contacts (see Figure 7.6), are primarily intended for use by
the PET service department or qualified dealers. When using the incorporated ROM diagnostic, a special
connector is used; this jumpers some of the top contacts to the bottom contacts. It is strongly advised
that the top connectors 1-12 be used only with extreme caution.
Pin
Signal
Signal
Identification
Character
Label
Description
1
Ground
Digital ground.
2
T. V. Video
Video output used for external display.
used in diagnostic routine for verifying
the video circuit to the display board.
3
IEEE·SRQ
Direct connection to the SRQ signal on
the IEEE·488 port. It is used in verify·
ing operation of the SRQ in the diag-
nostic routine.
4
IEEE·EOI
Direct connection to the EOI signal on
the IEEE-488 port. It is used in verify-
ing operation of the Eor in the diag-
nostic routine.
5
Diagnostic
When this pin is held low during power
Sense
up the PET software jumps to the diag-
nostic routine, rather than the BASIC
routine.
Table 7.6. Parallel user port information.
PET pin identification characters, the corresponding
signal labels and their descriptions.
Table continued on next page.
59
Advertisement
Table of Contents
