A) i) Describe the all pins of 82C55 programmable interface (PPI) IC. ii) Define command byte A & B of the command register in the 82C55 IC.
iii) Draw the proper circuit diagram of an 8-digit LED display interfaced to 8088
microprocessor through an 82C55 IC.

When a rectangular region is defined using an appropriate style, which value matches the specified edge of the clipping region to the edge of the parent element?

State the parts of a variable declaration?

Dean wants a quick way to look up staff members by their staff id. in cell q3, nest the existing vlookup function in an iferror function. if the vlookup function returns an error result, the text “invalid staff id” should be displayed by the formula. (hint: you can test that this formula is working by changing the value in cell q2 to 0, but remember to set the value of cell q2 back to 1036 when the testing is complete.)