Issue 2.0, which covers the entire ISA.

Final draft before release 2.0. Adds some notation description and a chapter for the architecture description, which incorporates some of the old intro and the old chapter on NOP side effects.

All 32-bit instructions described.

First batch of 32-bit ALU instruction described. Various typos fixed.

All 16-bit instructions described. Encoding of JAL corrected in the summary. R_b used to store the PC for all BAL and JAL instructions.

16-bit ALU instruction details complete. Change opcode mnemonics for ALU instructions with constant arguments. Off-by-one encoding for immediate shift values described.

Structure of detailed instruction descriptions refined. Most 16-bit ALU instructions now documented.

All instruction formats now shown. All summaries in new format.

First stage of improved formatting, using LibreOffice Impress to as the basis of the instruction format diagrams for 32-bit instructions (generating SVG and PNG). Clearer summary of instructions used for 32-bit ALU instructions.

Start of revision process. Remove load/store double instructions. Use second opcode field of 32-bit load/store as extra constant field. Make all load/store offsets signed. Make BAL use R_b rather than R_a to keep constant field contiguous.

Bump release number to 1.0 for issue.

First public release outlining the architecture.

Correct encoding of 32-bit branches (4 more bits of offset). Correct NOP constant meanings. Matches server/simulator commit b179463.

Full summary of all 16-bit and 32-bit instructions.

Updated preface in preparation for revised architecture.

Initial concept