SBC-11/21 Single-Board Computer Users Guide

This document is the SBC-11/21 Single-Board Computer User's Guide, published in June 1982 by Digital Equipment Corporation.

It serves as a comprehensive reference for users of the KXT11-AA (M8063-BA) SBC-11/21 module, covering:

• Configuration and Installation: Details on setting up the module, including jumper selections for operational features like battery backup, power-up, starting addresses, interrupts, parallel I/O configurations, memory maps (4Kb of RAM, sockets for up to 32Kb PROM/RAM), and real-time clock frequency (50/60/800 Hz).
• System Architecture: An explanation of the microprocessor (PDP-11 instruction set subset), its registers (including dedicated stack pointer R6 and program counter R7), hardware stack, interrupt system (11 sources, 4 priority levels, 2 non-maskable), Direct Memory Access (DMA) support, and memory organization (64Kb address space, byte/word addressing).
• Programming Information: How to program the on-board parallel I/O interface (with two bidirectional 8-bit ports and one control port) and two serial I/O interfaces (EIA RS-232C/RS-423 compatible, programmable baud rates from 300 to 38,400 baud).
• Instruction Set and Addressing Modes: A detailed list and description of the PDP-11 instruction set supported by the SBC-11/21, along with its addressing modes (single/double operand, direct, deferred, PC/SP as general-purpose registers).
• Theory of Operation: An in-depth look at the hardware's functional logic, microprocessor control signals, bus transactions (fetch/read, write, DMA, IAK, ASPI, NOP), mode register control, interrupt control logic, memory address decode, RAM/ROM memory sockets, power-up sequence, and clock control.
• Macro-ODT Option: Instructions for using the optional PROM-resident Macro-ODT (KXT11-A2) for module diagnostics, bootstrap programs for mass storage devices (TU58, RX01/02), console communications, and on-line debugging.
• LSI-11 Bus Interface: Description of the module's compatibility with the LSI-11 bus, including data transfer cycles, interrupt protocol, and control functions.
• Software Development: Guidance on creating, loading, running, and debugging stand-alone programs for the SBC-11/21.
• Comparisons: A detailed comparison of the SBC-11/21 with other LSI-11 microprocessors (LSI-11/2, LSI-11/23).
• Schematics and Glossary: Electrical schematics and a glossary of terms related to the SBC-11/21 module.

The guide is intended for users with M8063 Revision D and subsequent revisions of the SBC-11/21 module.