9 Jan
2003
9 Jan
'03
7:03 a.m.
Megan wrote:
It was my understanding that the EIS/FIS chip is only
usable with the
11/03 (11/2, PDT) machines (and the PDT requires the dual microm in
order to make space for it).
Frank wrote:
Sorry to correct you, but EIS/FIS is an option to the
F-11 uprocessor,
hence for 11/23, 11/23+ and 11/24 computers.
Sorry to correct you, but Megan was right. The 11/23, 11/23+, and 11/24
have EIS as a standard part of the instruction set, and no hardware or
microcode FIS support was available. The available options were the
KTF11-AA MMU chip, KEF11-AA floating point chip (which requires the MMU
chip), the FPF11 hardware floating point board, and the KEF11-BB CIS
hybrid (containing six chips!). There apparently was an earlier KEF11-BA
CIS for the 11/23 etc., which was packaged differently.
FIS was only available as an option on the 11/03 family (KEV11) and the
11/35 and 11/40 (KE11-F).
CIS was an option on the 11/23 family (KEF-11Bx), 11/44 (KE44), and
11/74 (KE74). The KE74 should work on some late-model 11/70 systems
based on the KB11-CM CPU (vs. the standards KB11-B and KB11-C), but it
is unknown whether any KE74s were actually sold.
The 11/03 family support the KEV11 option, which adds EIS and FIS. The
11/03 can support the KUV11 writable control store, which can be used for
EIS/FIS or user-written microcode. There is no CIS option for the 11/03;
there's not enough microcode address space available to implement it.