17 Apr
2025
17 Apr
'25
8:50 a.m.
Hello!
Den ons 16 apr. 2025 kl 21:36 skrev Jos Fries via cctalk <
cctalk(a)classiccmp.org>gt;:
The "RK11-D and RK11-E moving head disk drive
controller manual"
(EK-RK11D-MM-002) states in par. 2.5 (Installation Procedure) that the
register and vector addresses of a RK11-D can be configured by "seven
interrupt vector address jumpers and eight address selection jumpers of the
M7257". The manual however doesn't state the address range that can be
configured by these jumpers and refers to engineering drawing
D-CS-M7257-0-1 for that information. I found these drawings in the RK11-D
Engineering Drawings but cannot find information in them on the valid
address ranges. Therefore my question: what is the address range a RK11
controller can be configured for?
Most (All?) unibus devices can be set anywhere in the PDP-11 IO space. This
means the last 8kbyte of the 256k Unibus space. Addresses 760000 - 777777
octal. A quick glance at the schematic shows that this is true for the
RK11-D as well. What is interesting though is that the doc mentions 8
address jumpers while according to the schematic it has 10. Jumpers W4-W13.
/Mattis