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Re: Name the card, please

Subject: Re: Name the card, please
From: "David Wilson" <mcs6502@gmail.com>
Date: 14 Jan 2006 17:41:30 -0800
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Brian A. Davis wrote:
> On all of my A2 motherboards there is a 9334
> chip. After I did some searching, I found reference that the 9334 is an
> 8-bit addressable latch. This is the same description as the 74LS259.
> Apple obviously just used a different part that does the same job.

The 9334 is a Fairchild part number and is equivalent to the 74259
(standard TTL) according to my Nat Semi databook. This may give
slightly higher drive to the annunciators AN0..AN3. My II+ motherboard
is marked with 9334 and has a DM9334N (Nat Semi) in the socket.

The typical total power dissipation for the three chips is:

DM9334    280mW
DM74259   150mW
DM74LS259 110mW

Follow-Ups:
- Re: Name the card, please
  - From: Brian A. Davis <badavis@deleteme.rogers.com>

References:
- Name the card, please
  - From: myemail@fattimi.ei (Andrea)
- Re: Name the card, please
  - From: Brian A. Davis <apple2@deleteme.rogers.com>
- Re: Name the card, please
  - From: myemail@fattimi.ei (Andrea)
- Re: Name the card, please
  - From: Brian A. Davis <apple2@deleteme.rogers.com>

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