Caple C871i Manual de usuario descargar pdf (Pagina 53)

Apple II Computer Info

occur! Power supplies produced for the European market may vary from the

colors stated here. The placement of the voltage lines on the connector

plugs are standard but colors vary. Voltages/colors must be verified with

DC voltmeter for each power supply. The output voltages are normally LESS

THAN these values when measured without a full CPU load attached.

VOLTAGE APPLE II IBM

-------------------------------------------

ground Black Black

+5v Orange Red

+12v Yellow Yellow (or Orange)

-12v Green Blue (or Brown)

-5v Blue White (or Yellow)

COMPATIBILITY WITH RAMFAST AND/OR SECOND SIGHT CARDS

HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH

So far (Nov 1997), I have shipped about 30 IIe/II+ power

supplies and about 114 IIgs power supplies. 100%

compatibility has been reported with all configurations of IIe/II+. But

IIgs users are more likely to have their computers loaded with exotic

interface cards. There have been reported cases of interface card / power

supply incompatibilities by about 10-15% of IIgs users. No hardware has

been damaged; the incompatibilities cause crashes but no damage. These

incompatibilities relate to RamFast and/or Second Sight video cards. In

half the cases, replacement power units have solved the problem.

Why the incompatibilities? Two hypotheses are likely:

(a) maybe these cards are sensitive to the slower rise-time to the target

voltage which is characteristic of large power supplies, or (b) possibly

RamFast and Second Sight do not like a safety feature, the "no-load

auto-off" circuit. This circuit is a desirable safety feature, which

shuts the unit down if no load is detected on the output circuits. This

protection circuit is common to half the IBM-power supplies --- its

presence can be identified merely by checking whether the fan spins when

power is on but no load is attached.

To minimize the risk of an incompatibility, IIgs users are

asked to list their interface cards, and especially to mention whether

their IIgs has either a RamFast or Second Sight card. Having this

information will help me to ship the most compatible power supply model.

The no-load auto-off circuit is a desirable safety feature

in power supplies, so I will ship this version to users who indicate that

they have neither of the two fussy cards (RamFast or Second Sight).

MOLEX-4 SOCKETS FOR 5V OR 12V ACCESSORIES

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Each power unit has is supplied with one or two "Molex-4" female

power sockets. On IBM computers, these Molex-4 sockets run disk drives.

They have four pins with these usual color codes: RED (+5v DC), BLACK

(neutral), BLACK (neutral), and YELLOW (+12v DC). For Apple II

applications, the Molex-4 sockets have three uses: (a) for voltmeter

monitoring of the output voltages; (b) to attach a "dummy load" on units

that shut-off if no load is connected (the dummy load can be a junked hard

drive); (c) to operate +5v or 12v accessories.

Apple II Computer Technical Information : Apple II Family Hardware Info

ftp://ground.ecn.uiowa.edu/2/apple2/miscinfo/hardware : May 2001 : 53 of 572

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