Characterization of Single-chip Calculator Circuits - TMS1040 Family

The DCM-50A Platform supports the Characterization of TMS1040 Devices in its right-most TMS1000 Textool Test Socket with an additional TMS1040 Adapter and the voltages V_SS set to 9.5V and V_DD/V_GG set to -5.5V.

TMS1042NL

Device-under-Test:

Keyboard: The Canon Palmtronic LD-8Rs and its siblings LD-8s and LD-8Ms make use of a keyboard with with conductive rubber switches arranged in an 7*4 matrix with the rows connected to the R0-R6 Outputs (Display Scan) and the columns connected to the K1-K8 Inputs (Keyboard Scan) of the TMS1042NL single-chip calculator circuit. R8 is jumpered for the LD-8Rs with a Diode directly to K1.

Keyboard Matrix of the Canon LD-8s Series:

Notes: x₍₁₎ Implemented in TMS1042NL but not available on LD-8Rs, x₍₂₎ Implemented in TMS1042NL but only available on LS-8Ms, x₍₃₎ Implemented in TMS1042NL but only available on LD-8Rs. [AM] implemented with a hard-wired Diode in LD-8Rs only

Display: The Canon LD-8Rs makes use of a 9-digit Itron FG95D6 low-voltage Vacuum Fluorescent Display (VFD) connected directly to the respective 9 R Outputs (Display Scan) and 8 O Outputs (Segments) of the TMS1042NL and biased to approximately -30 Volts with its internal pull-down resistors connected to V_PP. We located in a LD-8s manufactured in May 1978 an Itron FG95F6 display while the LD-8Ms is using a similar Futaba 9-ST-11 display.

Display Layout:

The Output Decoder PLA of the TMS1042NL is programmed for 7-Segment displays with the following Output Assignments:

Display Fonts:

Scanning: Display and keyboard scanning is performed in R8 → R0 direction followed by an RX State to display the Decimal Point at the desired position at a rate of about 220 Hz. Blank Positions have a shorter Active Digit Time and longer Trailing Digit Blanking Time:

TMS1042NL

Device-under-Test:

Keyboard: The Sharp EL-8117K makes use of a keyboard with triangular snap-action dome switches (United States Patent 3,796,843 from March 12, 1974) arranged in an 7*4 matrix with the rows connected to the R0-R6 Outputs (Display Scan) and the columns connected to the K1-K8 Inputs (Keyboard Scan) of the TMS1042NL single-chip calculator circuit.

Keyboard Matrix of the Sharp EL-8117K:

Display: The Sharp EL-8117K makes use of a 9-digit Futaba 9-ST-12 low-voltage Vacuum Fluorescent Display (VFD) connected directly to the respective 9 R Outputs (Display Scan) and 8 O Outputs (Segments) of the TMS1042NL and biased to approximately -28 Volts with its internal pull-down resistors connected to V_PP.

Display Layout:

The Output Decoder PLA of the TMS1042NL is programmed for 7-Segment displays with the following Output Assignments:

Display Fonts:

Scanning: Display and keyboard scanning is performed in R8 → R0 direction followed by an RX State to display the Decimal Point at the desired position at a rate of about 220 Hz. Blank Positions have a shorter Active Digit Time and longer Trailing Digit Blanking Time:

TMS1043NL

Device-under-Test:

Keyboard: The TI-2550 III makes use of a keyboard with snap-action dome switches arranged in an 7*4 matrix with the rows connected to the R0-R6 Outputs (Display Scan) and the columns connected to the K1-K8 Inputs (Keyboard Scan) of the TMS1043NL single-chip calculator circuit.

Keyboard Matrix of the TI-2550 III:

Display: The TI-2550 III makes use of a 9-digit Itron FG95B1 low-voltage Vacuum Fluorescent Display (VFD) connected directly to the respective 9 R Outputs (Display Scan) and 8 O Outputs (Segments) of the TMS1043NL and biased to approximately -30 Volts with its internal pull-down resistors connected to V_PP. Please notice that Texas Instruments designed the calculator to accommodate the NEC LD8118L VFD, too. We refer these models as TI-2550 III (Version 2).

Display Layout:

The Output Decoder PLA of the TMS1043NL is programmed for 7-Segment displays with the following Output Assignments:

Display Fonts:

Scanning: Display and keyboard scanning is performed in R8 → R0 direction at a rate of about 240 Hz with one Blank State after R0 and R8 shorter than R7 to R1:

TMS1043BNL

Device-under-Test:

Keyboard: The TI-2550 III makes use of a keyboard with snap-action dome switches arranged in an 7*4 matrix with the rows connected to the R0-R6 Outputs (Display Scan) and the columns connected to the K1-K8 Inputs (Keyboard Scan) of the TMS1043BNL single-chip calculator circuit.

Keyboard Matrix of the TI-2550 III:

Display: The TI-2550 III makes use of a 9-digit NEC LD8118L low-voltage Vacuum Fluorescent Display (VFD) connected directly to the respective 9 R Outputs (Display Scan) and 8 O Outputs (Segments) of the TMS1043BNL and biased to approximately -30 Volts with its internal pull-down resistors connected to V_PP. Please notice that Texas Instruments designed the calculator to accommodate the Itron FG95B1 VFD, too. We refer these models as TI-2550 III (Version 1).

Display Layout:

The Output Decoder PLA of the TMS1043BNL is programmed for 7-Segment displays with the following Output Assignments:

Display Fonts:

Scanning: Display and keyboard scanning is performed in R8 → R0 direction at a rate of about 240 Hz with one Blank State after R0 and R8 shorter than R7 to R1:

TMS1044NL

Device-under-Test:

Keyboard: The Bohsei Model 1000 makes use of a keyboard with triangular snap-action dome switches (United States Patent 3,796,843 from March 12, 1974) arranged in a 9*4 matrix with the rows connected to the R0-R8 Outputs (Display Scan) and the columns connected to the K2-K8 and the "virtual" K10 Inputs (Keyboard Scan) of the TMS1044NL single-chip calculator circuit.

Keyboard Matrix of the Bohsei Model 1000:

Notes: K10 is a "virtual" 5^th Keyboard Input line connected with two diodes to the K2 and K8 Keyboard Inputs of the TMS1044NL

Display: The Bohsei Model 1000 makes use of an 8-digit Itron DP84K low-voltage Vacuum Fluorescent Display (VFD) connected directly to the respective 9 R Outputs (Display Scan) and 8 O Outputs (Segments) of the TMS1044NL and biased to approximately -26 Volts with its internal and three external (R6-100k Ohm, R7-100k Ohm, R8-12k Ohm) pull-down resistors connected to V_PP.

Display Layout:

The Output Decoder PLA of the TMS1044NL is programmed for 7-Segment displays with the following Output Assignments:

Display Fonts:

Scanning: Display and keyboard scanning is performed in R8 → R0 direction followed by an RX State to display the Decimal Point at the desired position at a rate of about 240 Hz. Blank Positions have a shorter Active Digit Time and longer Trailing Digit Blanking Time:

TMS1044NL

Device-under-Test:

Keyboard: The Privileg 858 MD makes use of a keyboard with with conductive rubber switches arranged in a 9*4 matrix with the rows connected to the R0-R8 Outputs (Display Scan) and the columns connected to the K2-K8 and the "virtual" K10 Inputs (Keyboard Scan) of the TMS1044NL single-chip calculator circuit.

Keyboard Matrix of the Privileg 858 MD:

Notes: [y z] Sliding Switch Function, y Switch open, z Switch closed. K10 is a "virtual" 5^th Keyboard Input line connected with two diodes to the K2 and K8 Keyboard Inputs of the TMS1044NL

Display: The Privileg 858 MD makes use of a 9-digit Futaba 9-ST-10 low-voltage Vacuum Fluorescent Display (VFD) connected directly to the respective 9 R Outputs (Display Scan) and 8 O Outputs (Segments) of the TMS1044NL and biased to approximately -28 Volts with its internal pull-down resistors connected to V_PP.

Display Layout:

The Output Decoder PLA of the TMS1044NL is programmed for 7-Segment displays with the following Output Assignments:

Display Fonts:

Scanning: Display and keyboard scanning is performed in R8 → R0 direction followed by an RX State to display the Decimal Point at the desired position at a rate of about 240 Hz. Blank Positions have a shorter Active Digit Time and longer Trailing Digit Blanking Time:

TMS1044NL

Device-under-Test:

Keyboard: The Brinlock Model 806 makes use of a keyboard with triangular snap-action dome switches (United States Patent 3,796,843 from March 12, 1974) arranged in a 9*4 matrix with the rows connected to the R0-R8 Outputs (Display Scan) and the columns connected to the K2-K8 and the "virtual" K10 Inputs (Keyboard Scan) of the TMS1044NL single-chip calculator circuit.

Keyboard Matrix of the Brinlock Model 806:

Notes: K10 is a "virtual" 5^th Keyboard Input line connected with two diodes to the K2 and K8 Keyboard Inputs of the TMS1044NL

Display: The Brinlock Model 806 makes use of a 9-digit Futaba 9-ST-11 low-voltage Vacuum Fluorescent Display (VFD) connected directly to the respective 9 R Outputs (Display Scan) and 8 O Outputs (Segments) of the TMS1044NL and biased to approximately -28 Volts with its internal pull-down resistors connected to V_PP.

Display Layout:

The Output Decoder PLA of the TMS1044NL is programmed for 7-Segment displays with the following Output Assignments:

Display Fonts:

Scanning: Display and keyboard scanning is performed in R8 → R0 direction followed by an RX State to display the Decimal Point at the desired position at a rate of about 240 Hz. Blank Positions have a shorter Active Digit Time and longer Trailing Digit Blanking Time:

TMS1044NL

Device-under-Test:

Keyboard: The Unisonic Model 1040-1 makes use of a keyboard with conductive rubber switches arranged in a 9*4 matrix with the rows connected to the R0-R8 Outputs (Display Scan) and the columns connected to the K2-K8 and the "virtual" K10 Inputs (Keyboard Scan) of the TMS1044NL single-chip calculator circuit.

Keyboard Matrix of the Unisonic Model 1040-1:

Notes: K10 is a "virtual" 5^th Keyboard Input line connected with two diodes to the K2 and K8 Keyboard Inputs of the TMS1044NL

Display: The Unisonic Model 1040-1 makes use of a 9-digit Futaba 9-ST-08A low-voltage Vacuum Fluorescent Display (VFD) connected directly to the respective 9 R Outputs (Display Scan) and 8 O Outputs (Segments) of the TMS1044NL and biased to approximately -27 Volts with its internal pull-down resistors connected to V_PP.

Display Layout:

The Output Decoder PLA of the TMS1044NL is programmed for 7-Segment displays with the following Output Assignments:

Display Fonts:

Scanning: Display and keyboard scanning is performed in R8 → R0 direction followed by an RX State to display the Decimal Point at the desired position at a rate of about 240 Hz. Blank Positions have a shorter Active Digit Time and longer Trailing Digit Blanking Time:

TMS1045NL

Device-under-Test:

Keyboard: The Canon F-31 makes use of a keyboard with conductive rubber switches arranged in a 9*4 matrix with the rows connected to the R0-R8 Outputs (Display Scan) and the columns connected to the K2-K8 and the "virtual" K10 Inputs (Keyboard Scan) of the TMS1045NL single-chip calculator circuit. The [+ - 2 - 0 - F] sliding switch is connected between the R1, R2, and R0 Outputs and K1 Input. R7 is jumpered with a Diode directly to K1.

Keyboard Matrix of the Canon F-31:

Notes: [y z] Sliding Switch Function, y Switch open, z Switch closed. K10 is a "virtual" 5^th Keyboard Input line connected with two diodes to the K2 and K8 Keyboard Inputs of the TMS1045NL

Display: The Canon F-31 makes use of a 9-digit Futaba 9-ST-11 low-voltage Vacuum Fluorescent Display (VFD) connected directly to the respective 9 R Outputs (Display Scan) and 8 O Outputs (Segments) of the TMS1045NL and biased to approximately -30 Volts with its internal pull-down resistors connected to V_PP.

Display Layout:

The Output Decoder PLA of the TMS1045NL is programmed for 7-Segment displays with the following Output Assignments:

Display Fonts:

Scanning: Display and keyboard scanning is performed in R8 → R0 direction followed by an RX State to display the Decimal Point at the desired position at a rate of about 240 Hz. Blank Positions have a shorter Active Digit Time and longer Trailing Digit Blanking Time:

TMS1045NL

Device-under-Test:

Keyboard: The Canon Canola L813 makes use of a keyboard with conductive rubber switches arranged in a 9*4 matrix with the rows connected to the R0-R8 Outputs (Display Scan) and the columns connected to the K2-K8 and the "virtual" K10 Inputs (Keyboard Scan) of the TMS1045NL single-chip calculator circuit. The [+ - 4 - 2 - 0 - F] sliding switch is connected between the R1, R2, and R0 Outputs and K1 Input and the [ - AM] sliding switch is connected between R8 and K1. R7 is jumpered with a Diode directly to K1.

Keyboard Matrix of the Canon Canola L813:

Notes: [y z] Sliding Switch Function, y Switch open, z Switch closed. K10 is a "virtual" 5^th Keyboard Input line connected with two diodes to the K2 and K8 Keyboard Inputs of the TMS1045NL

Display: The Canon Canola L813 makes use of a 9-digit Futaba 9-BT-18A low-voltage Vacuum Fluorescent Display (VFD) connected directly to the respective 9 R Outputs (Display Scan) and 8 O Outputs (Segments) of the TMS1045NL and biased to approximately -32 Volts with its internal pull-down resistors connected to V_PP.

Display Layout:

The Output Decoder PLA of the TMS1045NL is programmed for 7-Segment displays with the following Output Assignments:

Display Fonts:

Scanning: Display and keyboard scanning is performed in R8 → R0 direction followed by an RX State to display the Decimal Point at the desired position at a rate of about 240 Hz. Blank Positions have a shorter Active Digit Time and longer Trailing Digit Blanking Time:

TMS1045NL

Device-under-Test:

Keyboard: The Canon Canola L813 II makes use of a keyboard with conductive rubber switches arranged in a 9*4 matrix with the rows connected to the R0-R8 Outputs (Display Scan) and the columns connected to the K2-K8 and the "virtual" K10 Inputs (Keyboard Scan) of the TMS1045NL single-chip calculator circuit. The [+ - 4 - 2 - 0 - F] sliding switch is connected between the R1, R2, and R0 Outputs and K1 Input and the [ - AM] sliding switch is connected between R8 and K1. R7 is jumpered with a Diode directly to K1.

Keyboard Matrix of the Canon Canola L813 II:

Notes: [y z] Sliding Switch Function, y Switch open, z Switch closed. K10 is a "virtual" 5^th Keyboard Input line connected with two diodes to the K2 and K8 Keyboard Inputs of the TMS1045NL

Display: The Canon Canola L813 II makes use of a 9-digit Futaba 9-BT-18A low-voltage Vacuum Fluorescent Display (VFD) connected directly to the respective 9 R Outputs (Display Scan) and 8 O Outputs (Segments) of the TMS1045NL and biased to approximately -31 Volts with its internal pull-down resistors connected to V_PP.

Display Layout:

The Output Decoder PLA of the TMS1045NL is programmed for 7-Segment displays with the following Output Assignments:

Display Fonts:

Scanning: Display and keyboard scanning is performed in R8 → R0 direction followed by an RX State to display the Decimal Point at the desired position at a rate of about 240 Hz. Blank Positions have a shorter Active Digit Time and longer Trailing Digit Blanking Time:

Device-under-Test:

Keyboard: The Toshiba BC-8111B makes use of a keyboard with conductive rubber switches arranged in a 9*4 matrix with the rows connected to the R0-R8 Outputs (Display Scan) and the columns connected to the K2-K8 and the "virtual" K10 Inputs (Keyboard Scan) of the TMS1045NL single-chip calculator circuit.

Keyboard Matrix of the Toshiba BC-8111B and its siblings BC-8018B and BC-8112SL:

Notes: x₍₁₎ Implemented in TMS1045NL but not available on BC-8018B, x₍₂₎ Implemented in TMS1045NL but only available on BC-8111B, BC-8112SL and BC-8112SR. [y z] Sliding Switch Function, y Switch open, z Switch closed. K10 is a "virtual" 5^th Keyboard Input line connected with two diodes to the K2 and K8 Keyboard Inputs of the TMS1045NL

Display: The Toshiba BC-8111B makes use of a 9-digit Futaba 9-ST-08A low-voltage Vacuum Fluorescent Display (VFD) connected directly to the respective 9 R Outputs (Display Scan) and 8 O Outputs (Segments) of the TMS1045NL and biased to approximately -27 Volts with its internal pull-down resistors connected to V_PP.

Display Layout:

The Output Decoder PLA of the TMS1045NL is programmed for 7-Segment displays with the following Output Assignments:

Display Fonts:

Scanning: Display and keyboard scanning is performed in R8 → R0 direction followed by an RX State to display the Decimal Point at the desired position at a rate of about 240 Hz. Blank Positions have a shorter Active Digit Time and longer Trailing Digit Blanking Time: