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Re: [N8VEM-S100:2098] 32 MB Static RAM Board for the S-100 80386 CPU Board

Hi John
After my posting I noticed that Mouser have a large minimum order requirement but Digikey are showing 323 in stock  with a minimum quantity of 1 unit.
they are the TSOP package and not the ball array package so do-able.
I agree on your point of going to DRAM for larger capacity but outside of my skill range I'm afraid, I just wondered if the AS6C3216 would permit a cost reduction for the 32Mb board as I am currently leaning towards the 8Mb board on grounds of cost.
Is it possible to partially populate the mezzanine memory cards with say 1 chip each to get started and maybe add the others later when prices reduce or does the design necessitate all 16 chips to be fitted ?
David Fry
On Wednesday, December 4, 2013 9:17:16 PM UTC, monahanz wrote:

David, the only ones I can find are TFGGA (ball) mounted chips. These require special ovens to attach to a circuit board. Not practical for most users.  Have you see the normal SMD chips.


I’m really thinking after 32MG we need to somehow go to a  DRAM board. The delta increase in capacity/price is no longer worth it for SRAM.   Looking for a volunteer to lay out a DRAM controller etc.


Also FYI I am going to do a  80486 board next year.





From: n8ve...@googlegroups.com [mailto:n8vem...@googlegroups.com] On Behalf Of David Fry
Sent: Wednesday, December 4, 2013 11:32 AM
To: n8ve...@googlegroups.com
Subject: [N8VEM-S100:2098] 32 MB Static RAM Board for the S-100 80386 CPU Board


Hi John / Andrew


In anticipation of the likely new year release of the S-100 80386 board and associated memory boards I was pricing up the cost of memory chips for the 32Mb board and came across what appears to be a recently released chip from Alliance Semiconductor the AS6C3216 this chip (also surface mount)  has double the memory density of the chips used on the 32Mb board mezzanine cards and seems to be priced at UK £9.98p at Mouser UK



or $15.94 at Mouser US



Not sure if this is an option this late in the day to either double up to a 64MB board or lower the cost of building the 32Mb board, or maybe even allow an arrangement where the mezzanine cards can be added as funds allow for us more cash strapped builders :-)




David Fry

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