The Commodore 600 series was known as the B128 in the United States,
and the machine that was known there as the B256, was called the 700
series in Europe. These machines are also known as "CBM II Low Profile"
and "CBM II High Profile", respectively.
The 600 and the 700 series are almost identical, but 700 series machines
have a built-in monitor, a separate keyboard, and a different character
generator ROM. The 610/710 has 128kB RAM, the 620/720 has 256kB RAM,
and the 630/730 has 256kB RAM and a co-processor card (Z80 and 8088 were
planned, but it is not sure if these cards actually existed).
The 500 series uses a 6567/6569 VIC-II video chip instead of the 6845 CRTC.
It also runs at around 1 MHz instead of the 2 MHz of other Model B
computers.
Of th roms below, the kernal and BASIC 8k roms are 2364 / MCM68764 compatible,
while the character roms are .. complicated. The schematic says they are 4k
2332s, but also that pin 21 (an active-high chip select on the 2332) is A12,
which suggests it wants to be an 8k 2364/68764. I have no idea.
See also ../b/index.html and ../../../b/index.html.
Mirror sites – General information – File types – Data transfer
