Low Cost, High Resolution IBM 3101 Graphics
Original Publication Date: 1983-Nov-01
Included in the Prior Art Database: 2005-Feb-07
A graphics terminal is made utilizing an IBM 3101 terminal. The connection between the IBM 3101 base 10 and the display 20 is removed and, instead, the base 10 is connected to shift register 30. Shift register 30 combines a byte of data from either of the graphics memories 60 and 70 and combines it with data from base 10. The combined data is shifted out serially to display 20. The data entered into shift register 30 comes from only one of the graphic memories 60 and 70 at a time. Graphics microprocessor 50 updates one of the memories while the other is outputting data to shift register 30. Thereafter, the roles of the memories are swapped so as to avoid any conflicts which would occur if there were simultaneous access of the same memory, i.e.