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+GeckOS, Unix on 6502:
+http://www.6502.org/users/andre/osa/index.html
+
+eater.net: 6502 kit
+https://github.com/dpm-343/6502-monitor/blob/master/6502-monitor.ino
+
+other 6052:
+http://lateblt.tripod.com/6502prj1.htm
+74LS138 decoder IC (3to8)
+
+XA cross assembler
+http://www.floodgap.com/retrotech/xa/xa-old.html
+
+http://srecord.sourceforge.net/
+VIM xxd (hex to bin and vice versa)
+
+TL866II+ eeprom programmer
+https://gitlab.com/DavidGriffith/minipro/
+
+other projects
+http://www.stuartconner.me.uk/tms9995_breadboard/tms9995_breadboard.htm
+
+differences 6502 and 65c02:
+http://www.6502.org/tutorials/65c02opcodes.html
+
+https://jacob.jkrall.net/ps2-on-65c02
+PS/2 keyboard
+
+interrupts:
+http://www.ganssle.com/articles/anmi.htm
+
+UART:
+https://www.jameco.com/z/6551-Major-Brands-IC-6551-Asynchronous-Communication-Interface-Adapter-DIP-28-pin_43318.html
+
+assemblers for 6502:
+http://sun.hasenbraten.de/vasm/
+
+emulators for ben6502:
+https://github.com/alimansfield2016/ATM65C02_EMU, nice idea, c++ code quite bad
+https://github.com/alimansfield2016/ATM65C02_EMU.git, sadly in Javascript
+https://github.com/chanmix51/soft65c02, sadly in rust
+
+other/todo:
+https://news.ycombinator.com/item?id=22077052
+https://www.instructables.com/DIY-Paper-TapePunch
+http://wilsonminesco.com/BenchCPU/ (VIAs for all kind of external stuff)
+https://github.com/mist64/msbasic
+https://www.pagetable.com/?p=46
+
+documentation on old 8-bit logic:
+http://www.zimmers.net/anonftp/pub/cbm/documents/chipdata/index.html
+
+Geck/OS:
+http://www.6502.org/users/andre/csa/
+http://www.6502.org/users/andre/osa/index.html
+
+OS:
+https://github.com/janroesner/sixty5o2, uses Arduino and serial for loading programs,
+  good example of a bootloader assembly code, interrupt handling
+http://www.6502.org/users/andre/osa/oa1.html: OS/A65
+http://danceswithferrets.org/geekblog/?p=808 (monitor, http://exifpro.com/utils.html, emulator)
+
+7-segment:
+https://www.robotshop.com/community/forum/t/explaining-the-7-segment-display-and-74hc595-shift-register/13139
+https://www.eevblog.com/forum/projects/7-segment-hex-bus-display-with-eproms/
+https://www.youtube.com/watch?v=BA12Z7gQ4P0
+
+6502 links:
+https://www.eiroca.net/wiki/archive/awesome/6502
+http://wilsonminesco.com/
+
+practical stuff:
+https://www.instructables.com/Fix-a-broken-pin-on-an-IC-chip/
+DRY ZIF with paper and tape (george foot)
+
+other projects:
+http://minus56.com/
+https://www.chrisward.org.uk/6502/dev.shtml
+https://www.heiko-pruessing.de/projects/hbc65/
+https://c74project.com/ (a full 6502 in 74xx logic gates on PCB)
+https://github.com/Klaus2m5/6502_65C02_functional_tests (format tests and verification)
+
+delay/timers:
+https://gist.github.com/superjamie/fd80fabadf39199c97de400213f614e9
+http://6502org.wikidot.com/software-delay
+http://wilsonminesco.com/6502primer/PgmTips.html
+http://6502.org/source/general/clockfreq.htm
+http://wilsonminesco.com/6502interrupts/ (use VIA and NMI to produce a 10ms timer)
+
+software archives:
+http://6502.org/source/
+
+os:
+http://6502.org/source/kernels/minikernel.txt (timer and time slicing)
+
+apple emulator:
+https://damian.pecke.tt/2015/04/06/turning-the-arduino-uno-into-an-apple-ii.html