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Common Scoping Points

IP.com Disclosure Number: IPCOM000090852D
Original Publication Date: 1969-Jul-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 28K

Publishing Venue

IBM

Related People

Allen, EL: AUTHOR [+2]

Abstract

Output buses from computer registers are difficult to service during operation because they are time-multiplexed. Visual servicing of registers is made possible by identifying the desired time-frame and holding the data on the bus for examination. Contents of a computer's registers are displayed on a character display unit, for example, cathode ray oscilloscope CRO 4. Data to be displayed is gated to CRO 4 on a 72-bit bus 2 containing one latch per bit. Counter 8 gates different bus loads of data for display on the face of CEO 4. Cursor 20 is elongated to the width of a bus load of data. Counter 6 is stepped by control 5 to the position of the cursor. When counter 6 and counter 8 are equal, compare 7 stops counter 8 to hold the data on the bus 2 for scoping at 3. Cursor 20 is advanced to scope different data.

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Common Scoping Points

Output buses from computer registers are difficult to service during operation because they are time-multiplexed. Visual servicing of registers is made possible by identifying the desired time-frame and holding the data on the bus for examination. Contents of a computer's registers are displayed on a character display unit, for example, cathode ray oscilloscope CRO 4. Data to be displayed is gated to CRO 4 on a 72-bit bus 2 containing one latch per bit. Counter 8 gates different bus loads of data for display on the face of CEO 4. Cursor 20 is elongated to the width of a bus load of data. Counter 6 is stepped by control 5 to the position of the cursor. When counter 6 and counter 8 are equal, compare 7 stops counter 8 to hold the data on the bus 2 for scoping at 3. Cursor 20 is advanced to scope different data. Similar operations are possible using a microfiche viewer in place of CRO 4.

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