Routines
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63214: Read Keyboard Split
Control mode 5: reads both keyboard rows separately, returning the 63486 row in B and the 61438 row in C.
Read_Control_Keyboard_Split 63214 CALL Read_Keyboard_Rows Call Read_Keyboard_Rows to read both keyboard rows.
63217 AND %00011111 Mask the 63486 row result to five bits.
63219 LD B,A Copy the 63486 row result to B and load the 61438 row.
63220 LD A,C
63221 AND %00011111 Mask the 61438 row result to five bits.
63223 LD C,A Store the masked 61438 row result in C.
63224 POP HL Discard the stacked return address.
63225 RET Return.
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