In place of Irving Gould Acorn ended up with some clown called Stan Boland who decided it was better to change the name, stop making workstations and refocus on TV set top boxes. The company was dead six months later.
1. https://www.computinghistory.org.uk/det/29468/Acorn-MEMC-Dat...
2. Not sure whatever happened to the Acorn Risc Machine but I'm sure it'll turn up again. :P
This was unlike the "24-bit" 68000 where the hardware package actually only had 24 address lines, but its address registers and PC were 32-bit.
https://en.wikipedia.org/wiki/26-bit_computing#Early_ARM_pro...
The ARM3 resolved the situation by adding a separate 32-bit clean PC register and a separate status register, instead of the combined monstrosity. All software had to be rewritten to use the new registers if it wanted to be "32-bit clean", unlike 68000 software which either just worked fine, or revealed the programmer was an imbecile who thought they could get away with storing random data in the top 8 bits of addresses.
Bonus: the Archimedes memory map (00000000-03FFFFFF, i.e. 26 bits) https://www.chiark.greenend.org.uk/~theom/riscos/docs/ArcMem...
Case in point: Microsofts Amiga BASIC.