Owner

mattgodbolt

13 indexed repositories · View on GitHub

seasocks
Simple, small, C++ embeddable webserver with WebSockets support

C++ · 789 stars
zindex
Create an index on a compressed text file

C++ · 659 stars
jsbeeb
Javascript BBC micro emulator

JavaScript · 397 stars
xania
Xania MUD source

C++ · 66 stars
specbolt
Yet another ZX Spectrum Emulator

C++ · 44 stars
PALindrome
PAL encoder/decoder

C++ · 7 stars
chuckie-egg-2-beeb
A AI port of A&F Software's Chuckie Egg 2 (1985) from the 48K ZX Spectrum to the BBC Micro, in 6502 assembly.

Python · 3 stars
starglider-beeb
Starglider for the Beeb

Assembly · 3 stars
jsbeeb-mcp
MCP server for jsbeeb

JavaScript · 2 stars
nm
BBC Micro port of NM music

Python · 2 stars
xmos
BBC Micro eXtenstion ROM with useful utils

Assembly · 1 star
beeb-scorched-earth
Scorched Earth for the BBC B

JavaScript · 1 star
beeb-meta-data
Metadata registry for BBC Micro, Master and similar games, utilities and ROMs

JavaScript · 1 star

Beginner friendly Everything

Open All

Issues somebody may already be working on are listed last. List everything by date

Unable to select SSD on iOS
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bug disc ui

Difficulty 2/5 1-3 hours Newbie friendliness 55/100

mattgodbolt/jsbeeb#1823 · Opened Nov 9, 2026

Maintainers usually reply within 1 day
zq -l with several line numbers returns wrong lines on a -o (sparseLineOffsets) index
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bug

Difficulty 3/5 1-2 days Newbie friendliness 68/100

mattgodbolt/zindex#71 · Opened Nov 9, 2026

Maintainers usually reply within 1 day
zq prints a raw SQL 'no such table: index_default' error when the index has no default index
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bug

Difficulty 2/5 1-3 hours Newbie friendliness 73/100

mattgodbolt/zindex#67 · Opened Nov 9, 2026

Maintainers usually reply within 1 day
Index names with '-' or spaces fail with a raw SQL syntax error (name is spliced into the table name unquoted)
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bug

Difficulty 2/5 1-3 hours Newbie friendliness 66/100

mattgodbolt/zindex#66 · Opened Nov 9, 2026

Maintainers usually reply within 1 day
zindex --pipe hangs forever if the command block-buffers its output (stdbuf is no help with uutils coreutils)
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bug

Difficulty 4/5 3-5 days Newbie friendliness 44/100

mattgodbolt/zindex#65 · Opened Nov 9, 2026

Maintainers usually reply within 1 day
zq cannot open an index given as a file: URI that zindex --index-file accepts
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bug

Difficulty 2/5 1-3 hours Newbie friendliness 78/100

mattgodbolt/zindex#64 · Opened Nov 9, 2026

Maintainers usually reply within 1 day
zq fails with a zlib data error on a line spanning a concatenated-gzip member boundary when a member has no trailing newline
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bug

Difficulty 4/5 1-2 days Newbie friendliness 52/100

mattgodbolt/zindex#63 · Opened Nov 9, 2026

Maintainers usually reply within 1 day
Test hygiene: Catch2 REQUIRE on server threads, and no Windows coverage for static path checks
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Difficulty 4/5 3-5 days Newbie friendliness 47/100

mattgodbolt/seasocks#236 · Opened Nov 8, 2026
Static file serving follows symlinks out of the static directory
Open
- Is something wrong?
Difficulty 4/5 3-5 days Newbie friendliness 48/100

mattgodbolt/seasocks#234 · Opened Nov 8, 2026
Installed app: open disc files from the OS, write discs back, and keep local discs in OPFS
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disc feature ui

Difficulty 5/5 Over a week Newbie friendliness 25/100

mattgodbolt/jsbeeb#1807 · Opened Nov 8, 2026

Maintainers usually reply within 1 day
faster pasting
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feature input

Difficulty 4/5 3-5 days Newbie friendliness 48/100

mattgodbolt/jsbeeb#1804 · Opened Nov 3, 2026

Maintainers usually reply within 1 day
audit CRTC code
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timing video

Difficulty 4/5 3-5 days Newbie friendliness 22/100

mattgodbolt/jsbeeb#1802 · Opened Nov 2, 2026

Maintainers usually reply within 1 day
Loading an Atom state taken with a key down leaves the key stuck
Open
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acorn-atom bug input

Difficulty 2/5 1-3 hours Newbie friendliness 50/100

mattgodbolt/jsbeeb#1800 · Opened Nov 1, 2026

Maintainers usually reply within 1 day
The Atom's tape never refuses a step back: the PPIA is never given the input log
Open
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acorn-atom bug tape

Difficulty 3/5 1-2 days Newbie friendliness 35/100

mattgodbolt/jsbeeb#1798 · Opened Nov 1, 2026

Maintainers usually reply within 1 day
The desktop app never says a newer version is available
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feature ui

Difficulty 3/5 Half a day Newbie friendliness 66/100

mattgodbolt/jsbeeb#1794 · Opened Nov 1, 2026

Maintainers usually reply within 1 day
An Atom save state is not checked against the page's MMC card
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acorn-atom bug disc

Difficulty 3/5 1-2 days Newbie friendliness 45/100

mattgodbolt/jsbeeb#1782 · Opened Oct 31, 2026

Maintainers usually reply within 1 day
Touch game pad: layouts from per-game controls, presets and remembered choices
Open
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feature input ui

Difficulty 4/5 1-2 days Newbie friendliness 18/100

mattgodbolt/jsbeeb#1769 · Opened Oct 31, 2026

Maintainers usually reply within 1 day
Audit the hot path for allocations and string formatting
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performance

Difficulty 4/5 3-5 days Newbie friendliness 38/100

mattgodbolt/jsbeeb#1704 · Opened Oct 30, 2026

Maintainers usually reply within 1 day
Use jsbeeb's label-file parser in place of parseLabelDump
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Difficulty 4/5 3-5 days Newbie friendliness 45/100

mattgodbolt/beeb-meta-data#59 · 1 comment · Opened Oct 29, 2026

Maintainers usually reply within 1 day
Screen input ignores the PAL display's curvature (touchscreen, mouse joystick, debugger click)
Open
- Is something wrong?
bug input ui video

Difficulty 4/5 3-5 days Newbie friendliness 48/100

mattgodbolt/jsbeeb#1661 · Opened Oct 29, 2026

Maintainers usually reply within 1 day
6845: RA0's interlace parity flips at R6, mid-field; check against beebjit
Open
- Is something wrong?
bug timing video

Difficulty 4/5 3-5 days Newbie friendliness 42/100

mattgodbolt/jsbeeb#1652 · Opened Oct 29, 2026

Maintainers usually reply within 1 day
Drop files onto the disc in a drive, keeping their Acorn attributes (.inf / retro-files)
Open
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disc feature ui

Difficulty 5/5 Over a week Newbie friendliness 38/100

mattgodbolt/jsbeeb#1645 · 1 comment · Opened Oct 29, 2026

Maintainers usually reply within 1 day
Phone keyboard in landscape: work out whether and how it can work
Open
- Is something wrong?
feature input ui

Difficulty 5/5 Over a week Newbie friendliness 35/100

mattgodbolt/jsbeeb#1607 · Opened Oct 29, 2026

Maintainers usually reply within 1 day
Debugger: an event timeline
Open
- Is something wrong?
feature timing ui

Difficulty 5/5 Over a week Newbie friendliness 25/100

mattgodbolt/jsbeeb#1588 · Opened Oct 28, 2026

Maintainers usually reply within 1 day
Debugger: memory access heatmap and coverage shading
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- Is something wrong?
feature ui

Difficulty 4/5 3-5 days Newbie friendliness 35/100

mattgodbolt/jsbeeb#1587 · Opened Oct 28, 2026

Maintainers usually reply within 1 day
Debugger: a 6502 profiler and frame budget
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feature performance ui

Difficulty 5/5 Over a week Newbie friendliness 35/100

mattgodbolt/jsbeeb#1586 · Opened Oct 28, 2026

Maintainers usually reply within 1 day
Shared sessions in the desktop app
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- Is something wrong?
feature ui

Difficulty 5/5 Over a week Newbie friendliness 25/100

mattgodbolt/jsbeeb#1566 · Opened Oct 28, 2026

Maintainers usually reply within 1 day
Shift lock light left on after autotype with the XMOS ROM fitted
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- Is something wrong?
bug

Difficulty 4/5 3-5 days Newbie friendliness 22/100

mattgodbolt/xmos#54 · Opened Oct 28, 2026
Debugger: step backwards, back out to the caller, reverse continue, using rewind and replay
Open
- Is something wrong?
feature ui

Difficulty 5/5 Over a week Newbie friendliness 18/100

mattgodbolt/jsbeeb#1553 · Opened Oct 27, 2026

Maintainers usually reply within 1 day
Rethink the debugger around floating windows
Open
- Is something wrong?
feature ui

Difficulty 5/5 Over a week Newbie friendliness 15/100

mattgodbolt/jsbeeb#1551 · 2 comments · Opened Oct 27, 2026

Maintainers usually reply within 1 day
8271: confirm on hardware that an index pulse latches drive not-ready (#1524)
Open
- Is something wrong?
bbc-micro disc

Difficulty 2/5 1-3 hours Newbie friendliness 25/100

mattgodbolt/jsbeeb#1545 · Opened Oct 27, 2026

Maintainers usually reply within 1 day
Rainy day: model real Model B sideways ROM/RAM expansion boards
Open
- Is something wrong?
bbc-micro feature

Difficulty 5/5 Over a week Newbie friendliness 25/100

mattgodbolt/jsbeeb#1539 · Opened Oct 27, 2026

Maintainers usually reply within 1 day
Model for the B+
Open
- Is something wrong?
bbc-micro feature

Difficulty 4/5 3-5 days Newbie friendliness 48/100

mattgodbolt/jsbeeb#1527 · 1 comment · Opened Oct 27, 2026

Maintainers usually reply within 1 day
Write doubled scanlines once and let the display repeat them
Open
- Is something wrong?
performance video

Difficulty 5/5 Over a week Newbie friendliness 30/100

mattgodbolt/jsbeeb#1516 · Opened Oct 24, 2026

Maintainers usually reply within 1 day
Clear each framebuffer row when the drain first draws on it
Open
- Is something wrong?
performance video

Difficulty 5/5 Over a week Newbie friendliness 35/100

mattgodbolt/jsbeeb#1515 · Opened Oct 24, 2026

Maintainers usually reply within 1 day
Rainy day: move the SAA5050 decoder into Wasm
Open
- Is something wrong?
performance video

Difficulty 5/5 Over a week Newbie friendliness 35/100

mattgodbolt/jsbeeb#1507 · Opened Oct 23, 2026

Maintainers usually reply within 1 day
Video stream: bytes plus run headers explored, not faster (revisit later)
Open
- Is something wrong?
performance video

Difficulty 5/5 Over a week Newbie friendliness 25/100

mattgodbolt/jsbeeb#1499 · Opened Oct 22, 2026

Maintainers usually reply within 1 day
Video stream step 6: teletext into the stream, ready for #876's skew
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- Is something wrong?
performance video

Difficulty 5/5 Over a week Newbie friendliness 35/100

mattgodbolt/jsbeeb#1494 · Opened Oct 21, 2026

Maintainers usually reply within 1 day
Video stream step 5 (option): render in a Web Worker
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performance video

Difficulty 5/5 Over a week Newbie friendliness 25/100

mattgodbolt/jsbeeb#1493 · Opened Oct 21, 2026

Maintainers usually reply within 1 day
Video stream step 4 (option): a generated Wasm SIMD renderer
Open
- Is something wrong?
performance video

Difficulty 5/5 Over a week Newbie friendliness 30/100

mattgodbolt/jsbeeb#1492 · 1 comment · Opened Oct 21, 2026

Maintainers usually reply within 1 day
Video stream step 3: runs of raw video bytes with sparse control events
Open
- Is something wrong?
performance video

Difficulty 5/5 Over a week Newbie friendliness 25/100

mattgodbolt/jsbeeb#1491 · Opened Oct 21, 2026

Maintainers usually reply within 1 day
Video stream step 2: palette and mode as control records; renderer owns the half-cell repaint
Open
- Is something wrong?
performance video

Difficulty 5/5 Over a week Newbie friendliness 25/100

mattgodbolt/jsbeeb#1490 · Opened Oct 21, 2026

Maintainers usually reply within 1 day
Video stream step 0: measure the ceiling with a no-op blitFb
Open
- Is something wrong?
performance video

Difficulty 3/5 1-2 days Newbie friendliness 42/100

mattgodbolt/jsbeeb#1488 · 1 comment · Opened Oct 21, 2026

Maintainers usually reply within 1 day
Video: split fetch from render with a buffered pixel stream
Open
- Is something wrong?
performance video

Difficulty 5/5 Over a week Newbie friendliness 25/100

mattgodbolt/jsbeeb#1487 · 2 comments · Opened Oct 21, 2026

Maintainers usually reply within 1 day
CPU core runs ~25% slower after another program has run in the same process
Open
- Is something wrong?
performance

Difficulty 4/5 3-5 days Newbie friendliness 43/100

mattgodbolt/jsbeeb#1481 · Opened Oct 21, 2026

Maintainers usually reply within 1 day
Video.polltime: the inlining budget is the remaining performance lever
Open
- Is something wrong?
performance video

Difficulty 5/5 Over a week Newbie friendliness 35/100

mattgodbolt/jsbeeb#1480 · 9 comments · Opened Oct 21, 2026

Maintainers usually reply within 1 day
Atom 8255: port directions are fixed; mode-set control words aren't modelled
Open
- Is something wrong?
acorn-atom bug

Difficulty 4/5 3-5 days Newbie friendliness 35/100

mattgodbolt/jsbeeb#1436 · Opened Oct 20, 2026

Maintainers usually reply within 1 day
perf_sample: report emulator headroom in buckets
Open
- Is something wrong?
feature performance

Difficulty 4/5 3-5 days Newbie friendliness 52/100

mattgodbolt/jsbeeb#1346 · Opened Oct 18, 2026

Maintainers usually reply within 1 day
Investigate video rendering, copy and present costs (uses the harness)
Open
- Is something wrong?
performance video

Difficulty 5/5 Over a week Newbie friendliness 25/100

mattgodbolt/jsbeeb#1345 · Opened Oct 18, 2026

Maintainers usually reply within 1 day
Investigate polltime's cost (uses the harness)
Open
- Is something wrong?
feature performance

Difficulty 5/5 Over a week Newbie friendliness 25/100

mattgodbolt/jsbeeb#1344 · Opened Oct 18, 2026

Maintainers usually reply within 1 day

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