Hi,
Havent played anything hard on it to test if it is a valid 1802 but I have
comments and suggestions.
Build it as a basic engine, if it needs ram then set a external parameter
list for how much and what addresses, same for rom.
Simulate IO, if it has a uart on the N-lines then create the
registers/data you interact with (or the Q and Sense lines).
The console can be like the ELF (switches and lights) and/or
a RS232 tube connected via Q and F lines, software uart required
as part of the code as UT4 does.
Load UT4 (or whatever) from a start up list to emulate the rom
and have the 1802 engine execute the "rom" cone out of memory space.
This would allow code to "call" various ut4 routines like get or type.
The miniassembler is nice and plenty handy. You may want to consider
having it run like real code loaded into ram later on.
The core of the instruction set is fairly regular so the select tree
can be broken into functional sub trees for simpler code.
The version of TB I have is quest TB and I don't have it on machine
readable form (other than papertape which I currentlly can't read)
so I'd have to copy the pages and someone can have the fun of toggleing
it in, it'a about 1k or 2k.
Allison
On Wed, 3 May 2000, Mike wrote:
> Tonight I added the mini-assembler and memory block saves&loads to the 1802
> simulator. The 95/98/nt console binary and source-code are at:
>
> http://users.leading.net/~dogas/classiccmp/cosmac/vcosmac.htm
>
> >Allison
> >
> >Good runs under W95/nt then, have that running.
> >M!... Ah UT4. have manual.
>
> heh.. early influences...
>
> >Wheres Bin/CPP for it?
>
> Up there.
>
> Let me know if it doesn't do what you think it should.
>
> Thanks
> - Mike: dogas_at_leading.net
>
>
> >
> >Last emulator for 1802 I'd played with was z80 based, even on a 4mhz z80
> >it was faster than 1802. I wonder where I put that.
> >
> >
>
Received on Wed May 03 2000 - 12:50:41 BST