Caple C871i Bedienungsanleitung PDF herunterladen (Seite 158)

Apple II Computer Info

re-engineered the 65C816 to boost its performance. The Sanyo chips run at

higher speeds without needing higher voltages or cooling systems.

Western Design Center (WDC - the company behind development of the 65xxx

series) purchased a large batch of these chips directly from Sanyo and

have made them available to people wishing to upgrade their TWGS boards.

WDC have always been able to provide limited quantities of 'engineering

parts' which performed better than 7Mhz, but the Sanyo batch has brought

the average performance to greater than 12Mhz.

So with a faster processor available, are manufacturers offering faster

accelerators? Zip Technology offered an upgrade for a short time and now

list a 14Mhz Zip GSX card. Applied Engineering do not offer anything for

TWGS owners, but fortunately it is easy enough to do it yourself.

The procedure for upgrading a Zip GSX board involves cutting traces and

replacing logic array circutry, as well as purchasing a faster processor

and oscillator. At this stage the process is not well documented and

owners are advised to purchase the upgrade throught Zip Technology

directly.

Available Documentation

Until now, for most of us at with 7Mhz Transwarps, the quest for speed

has been a little daunting. Getting accurate upgrade information and

finding parts suppliers has been difficult.

The article by Andrew Hall, prepared for Western Design Center and

published in September 1991 Applecations, outlines four steps for getting

the best possible speed out of the TWGS.

The National AppleWorks Users Group (NAUG) publication 'AppleWorks Forum'

has three articles containing very detailed, accurate and informative

information written by John Link. The issues are March, April and May

1991. These three issues are considered 'must read' material and are

supplied by WDC to any prospective TWGS upgrader. When you contact WDC to

purchase a 65C816 chip, they will insist on sending this document (by fax

or mail) before processing your order.

The aim of this article is to give additional information not generally

available. The upgrading steps are still the same, but now the faster

parts available make it easier to get a faster speed which may tempt more

Transwarp GS owners to break the 10Mhz barrier.

Prerequisites

The TWGS needs ROM version 1.5 (or greater) to work at speeds greater

than 7Mhz. The current ROM can be obtained directly from Applied

Engineering for US$20. The NAUG document describes how to replace the

ROM. It is recommended that the TWGS have the 32k Cache upgrade. This

will give you the latest ROM, faster cache memory and complimentary

performance improvements. The 32k Cache upgrade can be purchased locally

from Two Series Software for $99.

The other speed dependent parts on the TWGS are the GAL chips which are

seated together on the right hand side of the card. The minimum versions

that are known to work are TWGS1A1, TWGS2B1, TWGS3E1, TWGS4B1, TWGS5A1,

TWGS6A1, TWGS7A1, TWGS8B1. A fast GAL chip set is available from LRO

Computer Sales for $79 + shipping. Applied Engineering's code for the set

is 10MHZPALKIT.

Obtaining the Microprocessor

Replacement 65C816 chips are obtained directly from WDC. The processors

cost US$95. Shipping by airmail is an extra US$5. NAUG members can obtain

65C816 chips for US$71.25. I really shouldn't point out that if a group

got together to purchase 65C816s in one shipment, that it would be

worthwhile for one person to join NAUG - membership is US$31.

Apple II Computer Technical Information : Apple II Family Hardware Info

ftp://ground.ecn.uiowa.edu/2/apple2/miscinfo/hardware : May 2001 : 158 of 572

1 2 ... 153 154 155 156 157 158 159 160 161 162 163 ... 571 572

Kommentare zu diesen Handbüchern

Keine Kommentare

Caple C871i Bedienungsanleitung Seite 158

Kommentare zu diesen Handbüchern

Verwandte Produkte und Handbücher für Kochfelder Caple C871i