Re: Four-Bit (ALU) Slice (was: Quad-Bit Slicers)

Mark Shostak (DOS) wrote:

>Um, the 2901 is a *4 bit* ALU; not really the same as a quad 1 bit ALU.
>A 1 bit ALU isn't really that useful, but I digress.
>
>

I thought I was the only one around these parts that digressed!

>The math box cascades four, 4 bit ALUs to produce a *16 bit* ALU.
>
>There is no off the shelf single chip replacement. You could put all four in a single fpga
>if you were really board.
>
>

The 2916 (or was it a 29116?) was 4 2901's and a 2902 lookahead carry
generator in one huge package. In any case, no one socket on the game
board is going to have all the data for an all-in-one chip).

These days a gate array could probably do the job and would be faster
and lower power to boot (no relation to me (a joke)).

(But I digress).

>-Mark
>
>
>----- Original Message -----
>From: Curtis H. Wilbar Jr. <vector@hawkmountain.net>
>To: <vectorlist@synthcom.com>
>Sent: Wednesday, February 12, 2003 10:59 AM
>Subject: Re: VECTOR: Quad-Bit Slicers
>
>
>
>
>>If I am correct in what I've been reading, I think the quad
>>bitslice atari chips are 4 AM2901s in one package. So, if
>>that is the case, then an AM2901 is a direct replacement for
>>the single bit slice chips like in BZ, Tempest, etc.
>>
>>-- Curt
>>
>>
>>
>>>From: MKDUD@aol.com
>>>Date: Wed, 12 Feb 2003 10:36:49 EST
>>>Subject: Re: VECTOR: Quad-Bit Slicers
>>>To: vectorlist@synthcom.com
>>>MIME-Version: 1.0
>>>
>>>In a message dated 2/11/2003 9:01:38 PM Eastern Standard Time,
>>>tony@tonyjones.com writes:
>>>
>>>
>>>
>>>
>>>>>you can even put one into a battlezone/tempest instead of the 4 original
>>>>>
>>>>>
>>>>chip
>>>>
>>>>
>>>>>s.
>>>>>
>>>>>
>>>>Sorry to be the bearer of bad news but AM2901s (the 40pin branded variant
>>>>of these bit slice chips) are $1.50 each from B&G Micro. They've had them
>>>>at this price for longer than I can remember.
>>>>
>>>>
>>>>
>>>>
>>> Can one of these go in ANY socket on the BZ/Tempest/RB aux board, and
>>>eliminate all 4 of the 137004's?
>>>
>>>Thank You,
>>>MK
>>>
>>>
>
>
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Received on Thu Feb 13 01:21:16 2003