#: 18851 S12/OS9/68000 (OSK)
    19-Sep-93  20:36:49
Sb: #Accelerator
Fm: Carl Kreider 71076,76
To: MM/1 owners

MM/1 owners,

I need a small poll of potential MM/1 accelerator customers.  We have placed
three beta units and preliminary results are starting to come in.  The first
disturbing one is that Paul's board house apparently substitiuted 74HC257 parts
for the spceified 74AC257 parts.  The result of this is that the MM/1 will not
run with three cycle memory access.

There are two solutions: ship a four cycle pal or replace the 257's.  The four
cycle pal will reduce performance by 20% (2800 dhrystones at 16Mhz to 2250),
which is still a large improvement, but not as much as *I* wanted when we
designed this.  You can install proper parts (three needed, available from
DigiKey for $1.23 each), or Kevin or perhaps Mark could provide and install the
right parts for perhaps $25.

The question then is, is there preference for any of the three solutions or are
there more alternatives?
 1) Four Cycle pal and lower performance.
 2) You change three chips.
 3) You pay someone else to change three chips.
 4) ???????

Please reply to 71076,76 (or 71076.76@compuserve.com)

I don't know where most MM/1 users hang out.  Could someone perhaps copy this
to any other services where MM/1 users can be found?

Carl

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