Tandy 1000 HX Technical Reference Manual page 198

NEC
A/PD80C35/C48, /iPD48
Operating Characteristics (cont)
Output High Current vs. Output High Voltage
Output High Current vs. Supply Voltage
Output High Current vs. Supply Voltage
Output Low Current vs. Supply Voltage
4-233
Output High Current vs. Output High Voltage
Output Low Current vs. Output Low Voltage