Caple C871i Bedienungsanleitung PDF herunterladen (Seite 508)

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Apple II Computer Info

SECTION 2 - Accellerator IIe INFORMATION

PROCESSOR

The Accellerator IIe is based on a CMOS 6502 microprocessor

running at 3-1/2 MHZ. This replaces the Apple's 1 MHz 6502

processor for all computation. The Accellerator's clock is derived

from the 7M signal on the expansion bus. The frequency is divided

by 2 for normal operation of the Accelerator. Synchronization of

off-board cycles is accomplished by cycle stretching.

CMOS parts are particularly sensitive to static

electricity, and for this reason the Accellerator IIe should be

handled with some care. Ground yourself by touching the Apple's

power supply before removing the Accellerator IIe from its

anti-static bag. Place the board on a piece of aluminum foil or

other conductor to set the switches and jumpers. Be sure every pin

on the back of the board is touching the conductor during the

operation. Once the board is plugged in, never touch it without

first touching the power supply. Avoid excess handling of the

Accellerator IIe. The board should always be kept either in its

anti-static bag or in one of the Apple's slots.

MEMORY

CONTROL PORT

The Accelerator IIe operating mode may be controlled by

execution of a machine language write cycle or BASIC poke according to

table 1:

Table 1

_________________________________________________________________________

Data to

Address write Function

_________________________________________________________________________

C086 05H High speed (normal operating

mode, set on power-up)

C086 01H Low speed

C086 0AH Disable

I think this should give enough information to write a simple basic

program to set the speed of the card or disable it.

Paul [email protected]:

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Apple II Computer Technical Information : Apple II Family Hardware Info

ftp://ground.ecn.uiowa.edu/2/apple2/miscinfo/hardware : May 2001 : 508 of 572

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