Re: [M100] Z80 conversion kit

[Stephen Adolph]

The NSC800 conversion is mostly compatible stand alone with M100 software.

There are a couple of things it can't do, like use the cassette port or
importantly it cannot run REXMGR.

(The latter is because all of REX leverages undocumented opcodes.  I don't
want to rewrite REX# or REXCPM software for this. )

But you do need REXCPM  hardware to support CPM.

That's why for the most part it only makes sense to drop in a Z80 if you
want to run CPM.  Then you get access totally the software out there.

Without the REXCPM hardware you get .. an M100 work alike.  Well it can run
Z80 opcodes too in case you want to write machine code.

Cheers
Steve



On Friday, January 19, 2024, r cs  wrote:

> I am interested.  What upgrade path would you recommend for someone with
> half a dozen first gen REX and first gen non-REX CPMs?
>
> Thanks,
> rcs
>
> On Fri, Jan 19, 2024 at 6:09 PM Stephen Adolph 
> wrote:
>
>> Hi folks,
>> Before the break I built an NSC800 conversion kit for someone who I guess
>> changed their mind.
>>
>> So, this kit is here and available if anyone is interested.  Ideally
>> you'd use this with a REXCPM and use it for actual CPM stuff.
>>
>> Let me know if you feel the urge to swap the brain of your M100!
>>
>> Steve
>>
>
>
> --
> *Níl aon tinteán mar do thinteán féin. *[Irish Gaelic]
> (There is no fireside like your own fireside.)
>
>
>

Re: [M100] Z80 conversion kit

[Stephen Adolph]

I should mention that thr hard thing in this upgrade is to desolder the
80C85 and to solder instead a socket into which you plug an adapter board
plus NSC800.

Ao, that part would be on the user to sort out ;).

Steve


On Friday, January 19, 2024, Stephen Adolph  wrote:

> Hi folks,
> Before the break I built an NSC800 conversion kit for someone who I guess
> changed their mind.
>
> So, this kit is here and available if anyone is interested.  Ideally you'd
> use this with a REXCPM and use it for actual CPM stuff.
>
> Let me know if you feel the urge to swap the brain of your M100!
>
> Steve
>

Re: [M100] Z80 conversion kit

[r cs]

I am interested.  What upgrade path would you recommend for someone with
half a dozen first gen REX and first gen non-REX CPMs?

Thanks,
rcs

On Fri, Jan 19, 2024 at 6:09 PM Stephen Adolph  wrote:

> Hi folks,
> Before the break I built an NSC800 conversion kit for someone who I guess
> changed their mind.
>
> So, this kit is here and available if anyone is interested.  Ideally you'd
> use this with a REXCPM and use it for actual CPM stuff.
>
> Let me know if you feel the urge to swap the brain of your M100!
>
> Steve
>


-- 
*Níl aon tinteán mar do thinteán féin. *[Irish Gaelic]
(There is no fireside like your own fireside.)