Urs König writes:
“The ZX8301 is the ‘Master Chip’ of the Sinclair QL Professional Computer.
Its purpose is documented in the Sinclair QL Service Manual. See:
The chip designed by David Karlin and manufactured by Plessey. See:
There are two known editions of the chip, the CLA2310 and the later CLA2345. Their mask differs.
Way back in May 2014 I explored the die of a Sinclair ZX8301 CLA2345 chip with my newly acquired BRESSER MicroSet microscope. Another QLer is currently exploring a CLA2310. This motivated me to review my work and publish the material (both video and stills) I’ve shot using the microscope.
More to come from either me or other QLers.”