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Updated the parser to handle processing a simple load byte instruction. Added the LODB opcode to the opcode enum listing and updated the Scanner to look for 'byte' and mark it as a directive.

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glm94
2023-03-24 23:24:24 -05:00
parent f96e1c6380
commit 95ed2143ea
7 changed files with 131 additions and 24 deletions
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docs/document.tex
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@@ -73,11 +73,11 @@
or "word" for two bytes. That would make the assembly easier to read but put a bit more work on the
assembler. The Stack Pointer will start 2 bytes above the video memory start.
\section{STOB (Store Byte)}
\OpcodeTable{0x20}{stob}{Register}{Address}\\[6pt]
Stores a single byte (the lower nibble) from a register to a memory address.
\OpcodeTable{0x20}{stob}{Register}{Register}\\[6pt]
Stores a single byte (the lower nibble) from a register to a memory address store in a register.
\section{STOW (Store Machine Word)}
\OpcodeTable{0x20}{stow}{Register}{Address}\\[6pt]
Stores a machine word from a register to a memory address.
\OpcodeTable{0x20}{stow}{Register}{Register}\\[6pt]
Stores a machine word from a register to a memory address stored in a register.
\section{LAA (Load Absolute Address)}
\OpcodeTable{0x00}{laa}{Register}{Address}\\[6pt]
Loads an address (2 bytes) into the register.