All microbees had bit mapped graphics but to varying degrees.
For the original model it has a 128x128 (1/8 screen) hires mode.
For the Alpha Plus (aka Premium Series) it has 256x256, 320x256 and 512x256 (full screen) hires modes.
As for the question of "PCG or bitmapped graphics" - the answer is that PCG can be arranged to fully function as bitmapped graphics.
Have a look at the "doppelganger" posts for some screenshot examples.
The bee can run real arcade games such as Space Invaders, Space Chaser & Balloon Bomber.
It can also run ZX Spectrum, Exidy sorcerer, TRS80 & Apple 2 games.
With a few tweaks the microbee can be made to run true colour bitmapped graphics and run arcade games such as PACMAN etc.
For the original model it has a 128x128 (1/8 screen) hires mode.
For the Alpha Plus (aka Premium Series) it has 256x256, 320x256 and 512x256 (full screen) hires modes.
As for the question of "PCG or bitmapped graphics" - the answer is that PCG can be arranged to fully function as bitmapped graphics.
Have a look at the "doppelganger" posts for some screenshot examples.
The bee can run real arcade games such as Space Invaders, Space Chaser & Balloon Bomber.
It can also run ZX Spectrum, Exidy sorcerer, TRS80 & Apple 2 games.
With a few tweaks the microbee can be made to run true colour bitmapped graphics and run arcade games such as PACMAN etc.