Hi, (comments embedded below)
From: allisonp_at_world.std.com <allisonp_at_world.std.com>
>
>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.
Yep, in there from the beginning.... maybe for multiple instances of cosmacs
'linked' to each other or at least as a few depositable c++ classes that can
be that generic engine.. But I didn't consider the "Load List" idea for
[all] individually specified ram and rom blocks to define a 'complete
system'. *snag* ;) Thanks. This LL should probably also specify any
additional 'hardware' thrown in (uart, parallel interface( probabbly
necessary to simulate a cosmac disk drives and raising CDOS in the emulator
(final goal)), etc)
> 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).
I'm reviewing the CDP1854 uart specs and a UT21 rom listing now and will add
it shortly. I need UT4! ( and UT3, etc... )
>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.
Thanks. And I see your point
> 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.
Somebody else has been there done that. Thanks Kirk!
Thanks for the suggestions, Allison! More soon.
:)
- Mike: dogas_at_leading.net
>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 Thu May 04 2000 - 09:41:20 BST