We provide replacements for hard-to-find Qbus controllers Your PDP-11 or MicroVAX is a workhorse, but what do you do when a controller fails and replacements are no longer available? Digital/Compaq no longer offers spares for some Qbus controllers. We may be able to help. The Logical Company has used leading-edge technology to re-design some of the old, familiar, but obsolete DEC controllers for the Qbus. Our controllers offer a fresh start -- a new controller with a new warranty and pin and signal compatibility with your existing DEC controllers. Click below to view or print a data sheet in Acrobat Reader 3.0 format. Download Acrobat Reader. If you prefer we fax or mail our product literature, e-mail us. Parallel I/O Controllers Our parallel I/O controllers offer a choice of 16-bit DMA or 64-bit non-DMA parallel I/O capability to match the performance you expect.   Parallel I/O Controllers  If you are using DEC's Digital Part No. Description Use our Model Size O/S Compatible Diagnostic Compatible  DRV11-WA M7651 16-bit DMA parallel I/O DCQ-1100 Data Sheet Price Dual  X  X   DRV11-J M8049 64-bit non-DMA parallel I/O  DCQ-1400 Data Sheet Price  Dual  X  X  DRQ3B M7658 16-bit DMA parallel I/O DCQ-1500 Data Sheet Price Quad X X Communication Controllers Our async communications controllers provide a choice of 8, 16, or 32 lines with full modem control. Contact us for a quote on these controllers.   Communication Controllers  If you are using DEC's Digital Part No. Description Use our Model Size O/S Compatible Diagnostic Compatible CXY08 CXY08 8-line async controller with modem (ours is 16 lines) CCQ-1600 Data Sheet Quad  X  X  CXA16 CXA16 16-line async controller with modem (we also offer 32 lines) CCQ-1600 CCQ-3200 Data Sheet Quad  X  X DHV11  M3104  8-line async controller with modem (ours is 16 lines)  CCQ-1600 Data Sheet  Quad  X  X IEEE 488 Controller We offer a dual line IEEE 488 interface that is compatible with DEC's IEQ11-AD.    IEEE 488 Controller  If you are using DEC's Digital Part No. Description Use our Model Size O/S Compatible Diagnostic Compatible IEQ11 M8634 IEEE 488, IEC controller DCQ-3100 Data Sheet Price Quad  X  X Interrupt Controller Our interrupt controller is just like DEC's with 16 programmable lines and fixed or rotating interrupt priority.   Interrupt Controller  If you are using DEC's Digital Part No. Description Use our Model Size O/S Compatible Diagnostic Compatible DRV11-J M8049 16-line interrupt controller DCQ-1400 Data Sheet Price Dual  X  X