Machine options
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Registers
Individual registers. These can be special purpose registers such as program counter, instruction register, memory address register, memory decrement register, and status register. For a simple machine, this could an accumulator. Specify the number of bits in each register.
Register arrays
This gives groups of registers that could be addressed as r[1], and so on. Specify the number of registers in each array and the number of bits in each register in an array.
Condition bits
Specifies bits of registers that have special meaning, such as a halt bit.
RAMs
Specify the name and length of a block of memory. A machine can have multiple blocks of memory, say for a stack and a heap.
Microcode instructions
Set instructions
Instructions that set portions of registers.
Test instructions
Instructions that test portions of registers.
Increment instructions
Instructions that increment the value in a register by a specified amount.
Shift instructions
Instructions that shift the value in a register into a possibly different register.
Logical instructions
Instructions that perform logical operations on the values in registers.
Arithmetic instructions
Instructions that perform arithmetic operations on the values in registers.
Branch instructions
Instructions that branch, apparently by a fixed amount.
TransferRtoR Transfer register to register instructions
Instructions that transfer parts or all of one individual register to another.
TransferRtoA Transfer register to array register instructions
Instructions that transfer parts or all of an individual register to an array register.
TransferAtoR Transfer array register to register instructions
Instructions that transfer parts or all of an array register to an individual register.
Decode instructions
Instructions that run an instruction in a register, such as the instruction register.
Set condition bit instructions
Instructions that set a condition bit, such as the halt bit.
I/O instructions
Instructions that read a value from a connection into a register, or write a value from a
register out to a connection.
Memory access instructions
Instructions that move values between memory and registers.
EQUs
Assembly language equivalences.
Fetch sequence
The sequence of microcode instructions run to fetch the next instruction and run it.
Machine instructions
Definitions of machine language instructions, with the opcode, field lengths, and the sequence of microinstructions that are run to carry out the machine instruction. Each microcode instruction sequence ends with the End pseudo-instruction.
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