>
>Subject: Re: Minimal CP-M SBC design
> From: Dave McGuire <mcguire neurotica.com>
> Date: Sat, 10 May 2008 12:29:24 -0400
> To: "General Discussion: On-Topic Posts
Only" <cctechclassiccmp.org>
>
>On May 9, 2008, at 12:36 PM, Chuck Guzis wrote:
>>> There is no requriement to boot the system from
"disk"
>>> and making that change can make bring up
simpler.
>>
>> But that's where the "authentic" aspect
fails me. Why run a
>> "vintage" CP/M system without the
experience a disk drive gives you?
>> You'll be deprived of the "BDOS Err on
B:" messages. What fun is
>> that?
>>
>> One might as well run an emulation program on a
PeeCee. I wouldn't
>> be at all surpised to find that someone's done it
for the iPod Touch--
>> there already exists a NEC 9801 emulator for that
platform.
>
> I dunno Chuck...the only reason more CP/M systems
weren't ROM-
>resident back in the day was due to convention, not
technical
>restrictions. I (personally) don't think there's
anything
>non-"period" about ROM-ing CP/M.
Worked for the PX8 and likely a few others.
Actually the real and most likely reason is you needed 8k or
so of
rom and back when Eprom (or enough eprom) that size was a
bit later
and even then expensive for a while. However by around 84ish
8 and
16k parts were getting reasonable and that is plenty enough
space.
Besides booting from rom is like booting from disk, the
differnce is
the rom is read only and doesn't rotate. Oh it is simpler.
As to "BDOS Err on B:" you can still have that if
the system only
boots from rom and still expects a floppy drive (or other
removable
media). Personally that is one of the error messages that I
can do
without. ;)
Allison
>
> -Dave
>>
>
>
>--
>Dave McGuire
>Port Charlotte, FL
>
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