Caple C871i Uživatelský manuál stáhnout pdf (Strana 569)

100

101

Apple II Computer Info

BBS 1-408-494-1430

Web http://www.jdr.com

Get a TTL Output Oscillator rated 4 times the speed you want the Zip to

run. For example, if you want 8MHz, get a 32MHz osc. For 10MHz, use

a 40MHz.

You will actually probably need a 30MHz, a 32MHz, a 36MHz, and a 40Mhz

oscillator:

Part #'s: OSC30.0, OSC32.0, OSC36.0, and OSC40.0

because you want to test the Zip to see how fast it will go. It may

top out below 10MHz. If it does, then you need a faster CPU and

faster cache RAM if you want 10MHz or faster.

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

You can get 64K's of fast cache from JDR Microdevices:

Get 4 Static Cache RAM chips,

Part #: HM62256LP-70

Price: $4.69 per chip (you need 4 of these for 64K)

You can get a 14MHz fast CPU from:

The Western Design Center (http://www.wdesignc.com)

2166 E. Brown Road (email: [email protected])

Mesa, AZ 85213

Part #: W65C816SPL-14 (for Zip GS or Transwarp GS accelerator

cards for the Apple IIgs computer)

Price: $19.80 + $4.00 shipping & handling

(Western Design Center requires payment by Money Order)

Once you get the cache chips and the CPU, remove the 4 (or 2) old cache

chips and plug in the 4 new ones, making sure the orientation of the

new chips is the same as the old ones were (you've just replaced slow

32K of cache with fast 64K cache). Remove the CPU chip and plug in

the new CPU. Finally, experiment with different oscillators, replacing

the original, and find the fastest one that works.

DIP switch settings have to be changed when changing cache size.

There are two banks of DIP switches on the Zip card.

Switches 7 and 8 on DIP bank 1 determine the cache size. Bank 1 is

the bank of DIP switches nearer the top of the card.

The settings are as follows.

size switch 7 switch 8

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

8K on on

16K on off

32K off on

64K off off

Apple II Computer Technical Information : Apple II Family Hardware Info

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Caple C871i Uživatelský manuál Strana 569

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