PDP11 PeripheralsHbk 1972 - Trailing-Edge

those functions. such as CONTROL RESET, SEEK and WR!TE LOCK., which normally
take only a few microseconds to initiate can actually take up to 3.3ms if in·
itiated while writing. For this reason the SEEK and WRiTE LOCK functions will
cause an interrupt (if bit 6 RKCS is set) as soon as the function has been successfully
initiated. The CONTROL RESET. which cannot cause an interrupt under any
circumstances, can, therefore, take up to 3.3ms to complete.
5.4.7 Specifications
RK02 Drive RK03 Drive
1 disk/drive
203 cylinders/drive: 128 data words/sector 256 data words/sector
2 surfaces/drive: 1536 data words/track 3072 data words/track
12 sectors/track: 307,200 data 614,400 data
words/ surface words! surface
1 to 8 drives/control: 614,400 data 1,228,800 data
words/ drive words! drives
Track to track:
Average random move:
Average rotation delay:
Data Transfer Rate:
Transfer Path:
Minimum Block Size:
Minimum Transfer:
Density:
Access Times (including head settling; typical):
I5ms
70ms
20 ms
22.2 J.l sec per word for RK02 drive
11.1 J.l sec per word for RK03 drive
Non-Processor Request (NPR)
Direct Memory Access
One sector (128 words for RK02 drive; 256 words
for RK03 drive)
1 word
1100 BPI max. for RK02 drive
2200 BPI max. for RK03 drive
Speed: 1500 RPM
Environmental Requirements: 60° to 90° F and 20% to 80% relative humidity
Model Designations
Control:
RKll-CA 117V + 10% 50/60Hz
RKll·CB 235V + 10% 50/60Hz
Bus Priority Level:
BR5
Interrupt Vector Address: 220
90