Common and Hidden Instructions in SHENZHEN I/O (Spoilers)

Basic instructions nop Does nothing. mov R/I R Copies the first operand into the second operand. jmp L Jumps to the specified label and executes the next instruction. slp R/I Sleeps for the number of time units specified by the operand. slx P Sleeps until data can be read from the XBus pin specified by the operand.

Arithmetic Instructions Registers can store integers from -999 to 999, inclusive. If an arithmetic operation produces a result outside this range, the system stores the nearest allowed value. For example, if acc is 800 and you execute add 400, the system stores 999 in acc. add R/I adds the first operand to the value in the acc register and stores the result in acc. sub R/I subtracts the first operand from the value in the acc register and stores the result in acc. mul R/I multiplies the first operand by the value in the acc register and stores the result in acc. not stores 100 in acc if acc is 0; otherwise, it stores 0 in acc. dgt R/I extracts the digit specified by the operand from the acc register and stores the result in acc. dst R/I R/I selects the digit in acc specified by the first operand and sets it to the value of the second operand. Test Instructions teq R/I R/I tests whether the first operand (A) equals the second operand (B). tgt R/I R/I tests whether the first operand (A) is greater than the second operand (B). tlt R/I R/I tests whether the first operand (A) is less than the second operand (B). tcp R/I R/I compares the first operand (A) and the second operand (B).   Hidden Instructions gen P R/I R/I generates a pulse. The first R/I specifies how long it stays on at 100, and the second R/I specifies how long it stays off at 0. @ marks initialization code that runs only once.