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Folder: sources
47 items under this folder.
17 May 2026
BBC Micro Line Drawing Implementations — Comparative Analysis
bresenham
line
technique
graphics
mode-4
mode-2
17 May 2026
raster.s — Annotated MODE 2 Line Rasterizer
bresenham
line
technique
graphics
mode-2
65c12
16 May 2026
ACCC — The Amstrad CPC CRTC Compendium (v1.7)
crtc
6845
reference
rupture
cpc
internal-counters
c0
c4
c9
c5
vma
vsync
hsync
16 May 2026
BBC Microcomputer Service Manual
service-manual
source
hardware
model-b
repair
16 May 2026
BBC Microcomputer User Guide (Coll, 1982)
user-guide
source
manual
acorn
model-b
16 May 2026
Chunky Graphics Mode — notes
chunky
video
mode-7
address-translation
ttxvdu
custom-modes
16 May 2026
hexwab — Cycle-exact display diddling (stable raster)
stable-raster
raster
timing
vsync
irq
t1
jitter
hardware
16 May 2026
Advanced Reference Manual for the BBC Master Series
master
m128
source
manual
acorn
16 May 2026
Master Series Reference Manual (Parts 1 + 2)
master
m128
source
manual
acorn
vdu
basic
mos
16 May 2026
Retrosoftware — Fast multiplication + fixed-point library
arithmetic
multiplication
fixed-point
lookup-tables
signed
16 May 2026
Retrosoftware — Smooth Vertical Scrolling
crtc
scrolling
vertical-rupture
raster
smooth-scroll
mode-2
16 May 2026
scarybeastsecurity — Sampled sound, 1980s style, from the SN76489
source
blog
sn76489
sound
sample
pcm
16 May 2026
SMSPower — SN76489 reference (Maxim et al.)
source
sn76489
sound
smspower
lfsr
noise
16 May 2026
Stardot — scarybeasts' SN76489 PCM playback threads (2025)
source
stardot
sn76489
sound
sample
pcm
16 May 2026
Twisted Brain — Bitshifters demo write-up
demo
crtc
raster
vertical-rupture
single-rasterline
kefrens
twister
parallax
copper
smooth-scroll
14 May 2026
AllMem: BBC System Memory Map (Ripley / Harston)
memory-map
reference
workspace
mos
14 May 2026
BeebWiki: Address translation
memory
dram
address-translation
crtc
video
scrolling
14 May 2026
BeebWiki: ANDY
memory
andy
shadow-ram
paged-rom
master
b-plus
14 May 2026
BeebWiki: CRTC
video
crtc
6845
14 May 2026
BeebWiki: Cycle stretching
timing
cycle-stretching
1mhz
slow-bus
performance
14 May 2026
BeebWiki: Video ULA
video
ula
palette
14 May 2026
Hitachi HD6845R/HD6845S Datasheet
crtc
6845
hitachi
datasheet
video
14 May 2026
SAA5050 — Combined References
saa5050
teletext
video
mode-7
13 May 2026
NAUG Appendix A + B — OSBYTE / OSWORD index
osbyte
osword
mos
reference
13 May 2026
NAUG Ch2 — BASIC Assembler
basic-assembler
opt
equ
labels
macros
user-zero-page
13 May 2026
NAUG Ch3 + Ch4 — Arithmetic & Addressing Modes
6502
65c12
addressing-modes
bcd
twos-complement
13 May 2026
NAUG Ch5 — 6502 Instruction Set
6502
65c12
r65c02
instruction-set
cycles
opcodes
13 May 2026
NAUG Ch6 — OS Introduction
mos
os-calls
vectors
zero-page
workspace
13 May 2026
NAUG Ch7 — Events
events
evntv
oseven
irq
13 May 2026
NAUG Ch8 — Interrupts
interrupts
irq
nmi
brk
irq1v
irq2v
13 May 2026
NAUG Ch9 — Buffers
buffers
insv
remv
cnpv
fifo
keyboard
printer
sound
13 May 2026
NAUG Ch10 — Escape
escape
osbyte
brk
13 May 2026
NAUG Ch11 — Hardware Introduction
hardware
sheila
overview
system-block
13 May 2026
NAUG Ch12 — Memory
memory
paged-rom
sideways-ram
shadow-ram
acccon
13 May 2026
NAUG Ch13 — Video/Graphics System
video
crtc
6845
video-ula
palette
scrolling
modes
13 May 2026
NAUG Ch14 — Keyboard
keyboard
ascii
inkey
internal-key-number
soft-keys
13 May 2026
NAUG Ch15 — Serial I/O (RS232/423)
rs232
rs423
6850
serial-ula
acia
cassette
13 May 2026
NAUG Ch16 — Filing Systems
filing-systems
osfile
osargs
osbget
osbput
osgbpb
osfind
dfs
adfs
cfs
rfs
nfs
wd1770
13 May 2026
NAUG Ch17 — Paged ROMs
paged-rom
service-call
language-rom
rfs
osrdrm
sideways-ram
13 May 2026
NAUG Ch18 — Tube / Second Processor
tube
second-processor
parasite
copro
6502-2p
z80
32016
13 May 2026
NAUG Ch19 — Clocks, Timers, CMOS
clock
timer
cmos
rtc
146818
master-specific
13 May 2026
NAUG Ch20 — ADC System
adc
joystick
upd7002
master-compact
13 May 2026
NAUG Ch21 — Sound / Speech
sound
sn76489
speech
oswords
slow-bus
13 May 2026
NAUG Ch22 — User/Printer & System VIAs
via
6522
system-via
user-via
timers
ifr
ier
13 May 2026
NAUG Ch23 — 1MHz Bus & Cartridges
1mhz-bus
fred
jim
cartridge
hardware-expansion
13 May 2026
NAUG Ch24 — Miscellaneous
break
reset
printer
code
line
netv
keyv
machine-id
13 May 2026
The New Advanced User Guide (NAUG)
reference
book
master
master-compact
model-b
b-plus
electron