Text 21164, 57 rader
Skriven 2021-05-30 13:26:36 av Benny Pedersen (2:230/0)
  Kommentar till text 21163 av Vincent Coen (2:250/1)
Ärende: 68K MBC
===============
Hello Vincent!

17 May 2021 15:32, Vincent Coen wrote to Benny Pedersen:

 VC>>> Even better is to use MPM for multi cpu systems works a treat.

 >> helo world in c does not need it :)

 >> imho mpm is just timesliceing tasks ?, but if this is limited to 64K
 >> ram its soon out of mem

 >> i still like to see mpm where it can be usefull, cpm is already
 >> multi-user atleast, while dos is not

 VC> My memory says no it is not limited to 64k. 1 Mb seems to ring a wee 
 VC> bell but even that can be over ridden if using the right fossils etc.

it depends on what cpu is used, z80 is true 8bit only, but as i remember it
have 16bit internal registers, that cant be used for more memory then 64k

if it was v20 cpu it have mmu to handle up to yes 1Mb :)

commodore 128d have mmu aswell, it was just never maked the 1024K extension
board to upgrade it, it colledged with the 128K internal mem, so it would have
to be 768k extension board hardware ram mapped with mmu block/banks with 64k
pages

would that be a dream machine ?, then bill could say no one needs more memory
then 1M with dos 1.0 :)

 VC> In the 70's I used to use it on a Cromemco with more than 1Mb but did 
 VC> switch over to Cromix (*nix) as I had to support more than 6 users running
at 
 VC> the same time using the same software, let alone others doing dev work and
MPM 
 VC> could not hack it even with a bunch of changes by myself and the lead
programmer 
 VC> in the US.

cpm 86 ?, i still not seen one of them on facebook, only so far z80 mbc, v20
mbc, 68k mbc is easy to find prints for now, but it could be nice to make cpm
86 mbc aswell

dream would had being if cpm was 32bit aswell, i remember acorn bbc, had a 2nd
board computer with the pipe connection, that was very expansive board at that
time, and zx80 was very checp killing the ground for new models with 32bit

had computers being 32bit in the first place we would not have to live with
ascii porn :)


 Regards Benny

... too late to die young :)

--- Msged/LNX 6.1.2 (Linux/5.12.7-gentoo-dist (x86_64))
 * Origin: I will always keep a PC running CPM 3.0 (2:230/0)