30 Sep
2023
30 Sep
'23
10:07 p.m.
On Sep 30, 2023, at 10:49 AM, Robert Armstrong
<bob(a)jfcl.com> wrote:
Yes, a J-11 but clocked at 10 MHz. Allegedly it is because the J-11 was originally
specified to go up to 20 MHz, and the Pro system control chip assumed that and used a
synchronous design for the other clocks. When the J-11 dropped down to 18 MHz, the design
couldn't deal with such non-integer ratios and had to drop back all the way to 10
MHz.
I have no idea of the merit of that story but it was a rumor I heard around the time that
machine arrived.
paul
Johnny Billquist <bqt(a)softjar.se> wrote:
... they locked themselves into slow hardware
and only use what the F11 could provide.
Didn't the PRO-380 have a J-11?
Although as I remember the J-11 CPU in the PRO was limited to a pretty
slow clock speed because of other system limitations.