Message-ID: <17053@sri-arpa.UUCP>
Date: Thu, 1-Mar-84 12:56:00 EST
Article-I.D.: sri-arpa.17053
Posted: Thu Mar  1 12:56:00 1984
Date-Received: Sun, 4-Mar-84 04:34:40 EST
Lines: 18

From:  Willie Lim 

We are looking for large expandable dual ported memories (those that
allow you to read and write simultaneously) for our dataflow
supercomputer project.  Due to the nature of the problem, we can
guarantee that a read and a write to the same location at the same
time can never occur (hence arbiters are not needed).  Are there any
such commercially available chips out there?  Is anyone making their
own custom VLSI version of such chips?  How large (in terms of memory
word size) are such chips?

All responses will be posted on the net.

Thanks.


Willie
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Message-ID: <17136@sri-arpa.UUCP>
Date: Fri, 2-Mar-84 10:04:00 EST
Article-I.D.: sri-arpa.17136
Posted: Fri Mar  2 10:04:00 1984
Date-Received: Fri, 9-Mar-84 01:13:44 EST
Lines: 7

Have you tried Mostek's new MK4501 BiPort FIFO?

See their ad in Electronics Feb 23,1984  page 72

Good Luck,

Jim Lannom

Message-ID: <1622@tekig1.UUCP>
Date: Sun, 22-Apr-84 16:21:23 EST
Article-I.D.: tekig1.1622
Posted: Sun Apr 22 16:21:23 1984
Date-Received: Thu, 26-Apr-84 01:20:50 EST
Organization: Tektronix, Beaverton OR
Lines: 22

X
     This is copied, without permission, from 'Digital Design' 4/84, pp 153

'Dual Port Memory Unit
 256K ram
     The Mc68HC34 is an 8-bit HCMOS dual-port RAM which facilitates
communications between microprocessors with different bus definitions
and clock timings.  It allows two processors operating on separate
busses to exchange data.  Interrupt registers are the mechanism by
which the processors interrupt each other.  The 256 <<<<<<>>>>>>!
dual-port RAM may be accessed from either microprocessor.  The MC68HC34
contains 6 read/write semaphore registers.  Price in quantities of
1000 is $25.  Motorola, Phoenix, AZ.'

256Kbytes, all in a single 40 pin package, for $25 no less, I'll take 10.
The angle brackets are mine, the 'Kbytes' is theirs, OH I love those typos.
Still, if it is 256Kbits, that is 32Kbytes, this sounds like a STEAL, unless
the price is really $2500, or it is 2.56 bytes.

Don Taylor
tektronix!tekig1!dont