Z80 REPL bug: trailing space breaks instruction parsing
A Hacker News discussion of a Z80 REPL highlights a parsing bug: adding a trailing space after an instruction with no operands causes it to be treated as unknown. The commenter also wishes for fish-style Tab completion to cycle through suggestions without typing more characters.
I also wish I could select from the completion list with Tab without typing more of the instruction, fish-style.
- jhallenworld
You should support symbols... For example, the monitor on my 6800 / 6809 Exorciser simulator has this (the "Offset at..." is printed when it fixes forward references):
~/exorsim$ exor -d
% a 1000
1000: start bra skip
1002: nop
1003: nop
1004: skip ldx #10
Offset at 1001 set to 02
1007: loop dex
1008: nop
1009: bne loop
100b: rts
100c:
% sy
1007 loop
1004 skip
1000 start
% u 1000
1000: 20 02 BRA $1004
1002: 01 NOP
1003: 01 NOP
1004: CE 00 0A LDX #$000A
1007: 09 DEX
1008: 01 NOP
1009: 26 FC BNE $1007
100B: 39 RTS
What would be even better: "a" brings up a built-in mini-editor. When you exit, the code is assembled.
- flyinghamster
The one thing I lamented about the Apple II Plus (vs. the original with Integer BASIC) was that to make room for autostart, they had to rip out the mini-assembler in the Monitor ROM. That was the closest thing I ever saw to an assembly-language REPL before this. At least they were able to keep the disassembler.
- jottinger
The source code for this is apparently 8 years old: https://github.com/abagames/z80-repl
With that said, I love the idea.