Right as Commodore was launching the Commodore 64 in 1982, they released another machine with 128K of RAM, 80 column display, 2 MHz CPU, a SID chip, an extended keyboard with numeric keypad. It wasn't the Commodore 128 falling through a timewarp from 3 years in the future, it was the B12880, a very interesting machine which was quickly abandoned by Commodore.

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Links:
Steve Gray's CBMII pages: http://www.6502.org/users/sjgray/comp...
CBUG Escape Issue 1: http://archive.6502.org/publications/...
Space Chase: http://www.spacechase.de
Commodore 700 reference: https://archive.org/details/commodore...
David Viner's tech info: https://www.davidviner.com/cbm3.html
CBUG / B128 History: https://www.insectria.org/b128/dusk.html
Bo Zimmerman's B128 page: http://www.zimmers.net/cbmpics/cbs.html

End credits music by https://bedfordlevelexperiment.bandca...

Index:
0:00 About the B12880
2:09 A look at the keyboard
3:43 Looking at the case and ports
5:27 A bit of history: CBUG to the rescue
6:41 Some BASIC 4.0+ exploration: RAM use and IF/ELSE
10:21 INSTR(), Error TRAPing
13:33 Using the ML Monitor: SYS 4
16:04 Playing Space Chase (released 2016): SID Music
18:30 Inside the case
20:15 Check the links, and thanks!