30 Mar
2018
30 Mar
'18
12:43 p.m.
On Fri, Mar 30, 2018 at 12:14 PM, Eric Smith via cctalk
<cctalk at classiccmp.org> wrote:
On Fri, Mar 30, 2018 at 1:08 PM, Glen Slick via cctalk
<
cctalk at classiccmp.org> wrote:
I just took another look at the two M3127 DESQA I have handy. The
M3127-PA Rev B02 with 23-334E5 / 23-335E5 firmware EPROMs and the
M3127-PA Rev D03 with 23-365E5 / 23-366E5 firmware EPROMs both have
AM7990DC/80 chips, with DEC 21-21672-09 part numbers.
(The main obvious difference between the B02 and D03 revisions is
header block jumpers vs push-button switch transceiver selection).
Found this thread on the subject from back in 2011. Doesn't seem to
include actual results of attempting a firmware only swap.
http://www.vcfed.org/forum/showthread.php?27062-DELQA-vs-DELQA-YM-(Turbo)
Are there any hardware differences between the
M7516 non-turbo and the
M7516-YM turbo versions of the DELQA, or only firmware differences?
Can you convert a non-turbo version into a turbo version just be
replacing the firmware EPROM?
The non-turbo I've seen use an AMD Lance ethernet chip (Am7990), while the
turbo I've seen use a DEC chip in its place. Could be important, or could
be coincidence.