Hi John, I'd take my usual 3x Two to build, one reference/spare. Thanks, Fabio On Oct 29, 2014 11:19 PM, "monahanz" <[email protected]> wrote:
> The 16MB Static RAM board sent out to many people earlier in the year > seems to have worked fine - at least I have heard of no problems with it. > One thing that I did not like about that 16MB static RAM board was the > need for the two mezzanine boards. While *the board works absolutely > fine* with any CPU I used with it (even our 80386 CPU board), it is a > tight fit in the S100 box. Also dare I say, it does not look pretty! > Putting eight CY62167DV30 static RAM chips directly on an S100 board would > be both difficult to fit and risky in terms of SMD soldering for many users. > With the advent of the newer AS6C3216 (4M X 8bit) static RAM chips, > soldering 4 chips on a board becomes more practical. > > I rearranged the board so it can now be configured as a S100 bus 8MB board > using the CY62167 chips or 16MB using the AS6C3216 chips. This BTW, was > the suggestion of Dave back earlier in the year. While the 74LSxx chips > have changed little, the top half of the board had to be completely > re-routed to accommodate the 4 SMD chips. See here for a picture of the > board:- > > > http://s100computers.com/My%20System%20Pages/16M%20RAM%20Board/16MG%20RAM%20Board.htm#A > Second Prototype 16MB Static RAM Board > > (bottom of the page). > > Anyway I checked out a prototype which seems to work fine for 8MG with > our 80386 board using the 80386 monitor RAM test and 2Mx8 chips. Because > it is a prototype, I have not yet tried the 4MX8 (16MB) configuration. > > This is an expensive board using expensive chips (each 4MX8 costs $21), I > do not expect many would be interested in getting a bare board like this, > but since I will be ordering 4 production boards for myself (gold > fingers etc), I will open the order up for a day or two for anybody else > that would like one. > > -- > You received this message because you are subscribed to the Google Groups > "N8VEM-S100" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "N8VEM-S100" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
