Caple C871i Uživatelský manuál stáhnout pdf (Strana 160)

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Apple II Computer Info

Increasing the power supply increases the performance of the processor,

oscillator and GAL chip components thereby giving improved system

performance. There are two methods of increasing the power supply to the

TWGS. The first is to increase the voltage level output from the power

supply which affects the whole system. Adjusting the power supply output

is not a user servicable operation. Applied Engineering sell a 5.25 volt

supply to NAUG members. The second is to use the 12 volt supply line on

the TWGS edge connector, see Andrew Hall's article for this procedure.

Running your 65C816 higher than 5.5 volts is asking for trouble. The

buffer chips in the TWGS and the IIgs are TTL and the design tolerances

on those don't guarantee they will survive anything above 5.5 volts.

There's going to be some drop, so feeding the 65C816 5.6 volts would

probably work since the rest of the machine will still see 5.5 volts, but

it is not recommended to go above 5.6 volts under any circumstances.

System testing

You should allow a significant period of running time to make sure that

your system is reliable. Your system may work well when cool but crash

unmercilessly when warm.

Success Stories

Steven Chiang (DreamWorld Software) 14Mhz

Tim Meekins (Procyon) 13.75Mhz

Chris Deschu (Internet user) 13.75Mhz

Chris Nelligan (AUG Vice-president) 12.5Mhz

Cameron Brawn (AUG Apple // sysop) 11.5Mhz

I am currently running my ROM 3 system at 12.5Mhz. I purchased a ROM 1.8S

Transwarp GS with the 32k cache upgrade directly from Two Series

Software.

The GAL versions are TWGS1A1, TWGS2B1, TWGS3E1, TWGS4B1, TWGS5A1,

TWGS6A1, TWGS7A1, TWGS8B1. I bought a WDC engineering part 65C816 for

$180 (including UPS freight and duty), a 50Mhz oscillator (to run my

system at 12.5Mhz) from Clarke & Severn for $7.50. I have not purchased

faster SRAMs or modified the power supply.

PARTS SUPPLIERS

High speed 65C816 processors are available from:

The Western Design Center Inc. (WDC)

2166 East Brown Road

Mesa, AZ. 85213

(602) 962-4545 (voice)

(602) 835-6442 (fax)

Talk to Deborah Lamoree when you call.

Oscillators are available from:

Clarke & Severn Electronics

PO Box 1

Hornsby NSW 2077

(02) 482-1944 (voice)

(02) 482-1309 (fax)

Digi-Key

701 Brooks Ave S

PO BOX 677

Theif River Falls, MN 56701-0677

(218) 681-6674

Apple II Computer Technical Information : Apple II Family Hardware Info

ftp://ground.ecn.uiowa.edu/2/apple2/miscinfo/hardware : May 2001 : 160 of 572

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