The AS8008S assembler supports the 8008 microprocessor using the early MCS-8 assembly language syntax of a Fortan based as- sembler/simulator (SIM-8) which had minimal lexical analysis. The instruction set contains a mnemonic for every variation of the basic instruction types. As an example the load accumulator operation has a mnemonic for load a with a (laa), load a with b (lab), load a with c (lac), load a with d (lad), load a with e (lae), load a with h (lah), and load a with l (lal).
8008 REGISTER SET The following is a list of the 8008 registers used by AS8008S: a - 8-bit accumulator b,c,d,e,h,l - 8-bit registers c,z,s,p - status word bits 8008 INSTRUCTION ADDRESSING MODES The following tables list all 8008 mnemonics recognized by the AS8008S assembler. The following list specifies the format for each addressing mode supported by AS8008S: Instruction Mnemonic Syntax: r register a,b,c,d,e,h,l c status bits c,z,s,p M memory access I immediate access Instruction Argument Syntax: #data immediate data byte or word data label call or jump label MMM input/output port The terms data, label, and MMM may all be expressions. Note that not all addressing modes may be valid with every instruction. Refer to the 8008 technical data for valid modes.
8008 INSTRUCTION SET Register Instructions Lrr LrM LMr LrI #data LMI #data INr DCr Accumulator Group ADr ACr SUr SBr NDr XRr ORr CPr ADM ACM SUM SBM NDM XRM ORM CPM ADI #data ACI #data SUI #data SBI #data NDI #data XRI #data ORI #data CPI #data Rotate Instructions RLC RRC RAL RAR Progarm Counter and Stack Control Instructions JMP label JFc label JTc label CAL label CFc label CTc label RET RFc RTc RST Input/Outpu Instructions INP MMM OUT MMM Machine Instruction HLT Combo Instruction SHL #data (load H and L with word #data)
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Last Updated: March 2021