Browse Prior Art Database

Microprogram Controlled Console

IP.com Disclosure Number: IPCOM000087469D
Original Publication Date: 1977-Feb-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 70K

Publishing Venue

IBM

Related People

Crandall, DR: AUTHOR

Abstract

When a microprogrammed device is to be operated separated from its usual controlling adapters, some console functions are required to enter addresses and data for control uses. It is seldom economical to provide a full console for such use. The described addition to the normal operating microprogram will enable use of existing switches and lights as a console. Console-mode programming may be entered by setting up a normally unused combination of the switches and operating a programming control "space" button, and can be exited by depression of a "restore" button. The console-mode functions are: 1) Enter an address to be used for display, alter or start execution. 2) Enter data at the address specified. 3) Display data at the address specified. 4) Branch to the address specified.

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Microprogram Controlled Console

When a microprogrammed device is to be operated separated from its usual controlling adapters, some console functions are required to enter addresses and data for control uses. It is seldom economical to provide a full console for such use. The described addition to the normal operating microprogram will enable use of existing switches and lights as a console. Console-mode programming may be entered by setting up a normally unused combination of the switches and operating a programming control "space" button, and can be exited by depression of a "restore" button. The console-mode functions are: 1) Enter an address to be used for display, alter or start

execution.

2) Enter data at the address specified.

3) Display data at the address specified.

4) Branch to the address specified.

5) Display the next address (address increments automatically

for multiple 4-bit entries).

6) Exit "console mode" and return to normal microprogram flow.

These functions can be selected by using as few as four switches or a hexadecimal switch, a space key and a restore key normally present in the device together with a group of four indicators to designate four bits.

As shown in the above figure, console mode will be entered by setting a specific switch combination and operating the space key to branch to the console mode. This will alternately turn the indicator lights on and off (blocks 1 and 2) to provide a blinking display. Next the switches will be set...