HP 10312D Operating Manual page 32

Table 1-1. Status Field Encoding
80286
Cycle Type
Interrupt Acknowledge
Halt/Shutdown
Memory Read
Memory Write
1/0 Read
1/0 Write
Opcode Fetch
Valid bytes in Transfer
(from BHE and AO)
Word (both bytes valid)
Low Byte
High Byte
Other Cycle Information
Lock
Hold Acknowledge
Note: x = don't care
Status Bit
76543210
xxOOOxxO
xx010xx0
x x 0 1 1 x x 0
xx010xxl
xxlOlxxO
xxlOOxxl
xxlllxxO
xxxxxOOx
xxxxxOlx
xxxxxlOx
xOxxxxxx
lxxxxxxx
Analyzing the Intel 80286
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