Question: Are the Commodore 128 and Amstrad CPC both 8 bit computers?

Context paragraphs:
The Last V8: The Last V8 is a video game published by Mastertronic on their M.A.D. label.  It was released in 1985 for the Commodore 64, Atari 8-bit and Amstrad CPC.  The title echoes a plot point from the Mad Max series of movies The design was done by Richard Darling and the programming by David Darling.  The graphics by Jim Wilson and music by Rob Hubbard.  It is one of the few commercial games to run in native mode on the Commodore 128.  The 128 version contained more levels (three instead of only two levels).  The first level, the one missing in the 64 version, has more complex mission objectives.

Amstrad CPC: The Amstrad CPC (short for "Colour Personal Computer") is a series of 8-bit home computers produced by Amstrad between 1984 and 1990.  It was designed to compete in the mid-1980s home computer market dominated by the Commodore 64 and the Sinclair ZX Spectrum, where it successfully established itself primarily in the United Kingdom, France, Spain, and the German-speaking parts of Europe.

Commodore 128: The Commodore 128, also known as the C128, C-128, C= 128, or occasionally CBM 128, is the last 8-bit home computer that was commercially released by Commodore Business Machines (CBM).  Introduced in January 1985 at the CES in Las Vegas, it appeared three years after its predecessor, the bestselling Commodore 64.

8 Bit Weapon: 8 Bit Weapon is a chiptune music band formed by Seth and Michelle Sternberger.  8 Bit Weapon was originally created by Seth Sternberger around 1999.  The instrument set of 8 Bit Weapon consists primarily of old 8-bit and 16-bit computers (with 8 bit audio output) such as the Commodore VIC-20, Commodore 64, Commodore 128, Commodore Amiga 500, and the Apple II, as well as game consoles such as the Nintendo Entertainment System, Game Boy, Atari 2600, and an Intellivision synthesizer.

Boulder Dash: Boulder Dash (バルダーダッシュ , Barudā Dasshu ) , is a video game released in 1984 by First Star Software for Atari 8-bit computers.  There have been numerous versions and sequels in this series for numerous interactive platforms including: Apple II, MSX, ZX Spectrum, Commodore 64, ColecoVision, NES, BBC Micro, Acorn Electron, PC, Amstrad CPC, Amiga, Intellivision, Mac, Xbox 360 and many other platforms.  It also influenced other games in the rocks-and-diamonds genre such as Repton.  The original Boulder Dash was created by Peter Liepa with Chris Gray, and on October 28, 1983, acquired by First Star Software, which still owns the rights to the game and the intellectual property, including the registered trademark: "Boulder Dash".

Spellbound (video game): Spellbound is a computer game that was designed and programmed by David Jones with music by Rob Hubbard and released in 1985 for the ZX Spectrum and Amstrad CPC (also with Ed Hickman) home computers.  Versions for the Commodore 64 (with Richard Darling) and the Atari 8-bit computers (with Adrian Sheppard) and an enhanced 128K Spectrum version with music and additional graphics were all released in 1986.  It is the second game in the Magic Knight series and was published by Mastertronic as part of their "Mastertronic Added Dimension" label.

Trailblazer (video game): Trailblazer is a video game that requires the player to direct a ball along a series of suspended passages.  Released originally by Gremlin Graphics for the ZX Spectrum, Commodore 64, Atari 8-bit family, Amstrad CPC and C16/plus/4 in 1986 (there was also an enhanced version on Amstrad CPC 3" disc).  It was ported to the Amiga and Atari ST.

Exolon: Exolon is a run and gun game programmed by Raffaele Cecco and published by Hewson in 1987 for the Sinclair ZX Spectrum, Commodore 64 and Amstrad CPC 8-bit computers.  It was later converted to Enterprise 128 and to the 16-bit Amiga and Atari ST platforms.

The Sentinel (video game): The Sentinel, released in the United States as The Sentry, is a puzzle video game created by Geoff Crammond, published by Firebird in 1986 for the BBC Micro and converted to the C64 (by Crammond himself), Amstrad CPC (with a cross-compiler written by Crammond), ZX Spectrum (by Mike Follin), Atari ST, Amiga (both by Steve Bak) and PC (by Mark Roll).  It was among the first games to feature solid-filled 3D computer graphics on home computers.  While it ran acceptably fast on 16-bit computers, it was slow on 8-bit machines such as the C64, where the next view took up to three seconds to be precomputed.  Despite this, the game retained a dedicated base of fans, some of whom were able to modify their computers to enjoy it better (for example, by using a CMD SuperCPU in a standard 1-MHz 6502 Commodore 64 to achieve CPU clock speeds of 20 MHz).  It won numerous awards upon release and has since appeared on several "best video games of all time" lists.

Grange Hill (video game): Grange Hill was a video game made for 8-bit computers including the Commodore 64, Sinclair ZX Spectrum and Amstrad CPC.  It was based on "Grange Hill", a popular children's television show.  The music was done by David Whittaker, but did not include the TV show's theme tune.

Supporting paragraphs: Commodore 128 Amstrad CPC
Answer: yes