Am following the Youtube channel of the 8-Bit-Guy who already did four >previous episodes of the Commodore history, starting with the PET.
This one https://www.youtube.com/watch?v=wzMsgnnDIRE is about the C128
and with 30 minutes quite long but very entertaining and interesting in
my opinion. Especially because Bil Herd is interviewed. and gives insight
why it was built and what obstacles they had.
On Sat, 06 Oct 2018 19:32:53 +1000, Lucifer wrote:
On Mon, 24 Sep 2018 17:05:05 -0400, Andreas Kohlbach
<ank@spamfence.net> wrote:
Am following the Youtube channel of the 8-Bit-Guy who already did four >>>previous episodes of the Commodore history, starting with the PET.
This one https://www.youtube.com/watch?v=wzMsgnnDIRE is about the C128 >>>and with 30 minutes quite long but very entertaining and interesting in >>>my opinion. Especially because Bil Herd is interviewed. and gives insight >>>why it was built and what obstacles they had.
They both think it has a C80 CPU and can use dool monitors.
No way that guy could design a computer.
Z80? It indeed has. And has a built-in monitor.
On 2018-10-06, Andreas Kohlbach <ank@spamfence.net> wrote:
On Sat, 06 Oct 2018 19:32:53 +1000, Lucifer wrote:
They both think it has a C80 CPU and can use dool monitors.
No way that guy could design a computer.
Z80? It indeed has. And has a built-in monitor.
The C128 indeed has a Z80, for CP/M mode. In fact, the computer boots using the Z80.
It has an Assembler monitor, but I think Lucifer means two screens at once.
It actually can, one using the 40 collumn mode and one the 80 character one.
On 17 Oct 2018 21:05:34 GMT, Etienne von Wettingfeld wrote:
The C128 indeed has a Z80, for CP/M mode. In fact, the computer boots using >> the Z80.
Are you sure?
It has an Assembler monitor, but I think Lucifer means two screens at once. >>
It actually can, one using the 40 collumn mode and one the 80 character one.
But not at the same time AFAIK. When you switch the mode the content what
was displayed in the mode before just froze on the other display.
* Andreas Kohlbach:
On 17 Oct 2018 21:05:34 GMT, Etienne von Wettingfeld wrote:
It has an Assembler monitor, but I think Lucifer means two screens at once. >>>
It actually can, one using the 40 collumn mode and one the 80 character one.
But not at the same time AFAIK. When you switch the mode the content what
was displayed in the mode before just froze on the other display.
Well, that depends on your point of view. There are a few gotchas:
The 40 column screen used a video chip closely related to the one in the
C64. As such, it could only operate on 1MHz - if you wanted to use the
128's higher clockspeed (a blazing fast 2MHz), you were forced to blank
the 40 colum screen and use the 80 column screen instead (as it used a separate video chip which didn't have this limitation).
So it did make sense to disable the 40 column screen, if the user switched over to 80. This is assuming that the user didn't really have 2 monitors
to begin with, but only switched input source on their monitor - the 40 column output would go to waste anyway.
But that doesn't mean it couldn't be done to have both outputs active. In fact, it was quite normal for software development.
A random demo I found on the interwebs:
https://www.youtube.com/watch?v=s2dcqkM-jeM
* Andreas Kohlbach:
On 17 Oct 2018 21:05:34 GMT, Etienne von Wettingfeld wrote:
The C128 indeed has a Z80, for CP/M mode. In fact, the computer boots using >>> the Z80.
Are you sure?
I'm quite sure Etienne is - and so am I ;)
On 2018-10-19, Martijn van Buul <pino@dohd.org> wrote:
* Andreas Kohlbach:
On 17 Oct 2018 21:05:34 GMT, Etienne von Wettingfeld wrote:
The C128 indeed has a Z80, for CP/M mode. In fact, the computer boots using
the Z80.
Are you sure?
I'm quite sure Etienne is - and so am I ;)
IIRC it has to do with the ability to auto-boot CP/M.
It checks if there's a CP/M disk, if yes it boots it, if no it switches
to the 8502.
IIRC it has to do with the ability to auto-boot CP/M.
On 17 Oct 2018 21:05:34 GMT, Etienne von Wettingfeld wrote:one.
On 2018-10-06, Andreas Kohlbach <ank@[...]> wrote:
On Sat, 06 Oct 2018 19:32:53 +1000, Lucifer wrote:
They both think it has a C80 CPU and can use dool monitors.
No way that guy could design a computer.
Z80? It indeed has. And has a built-in monitor.
The C128 indeed has a Z80, for CP/M mode. In fact, the computer boots using the Z80.
Are you sure?
It has an Assembler monitor, but I think Lucifer means two screens at once.
It actually can, one using the 40 collumn mode and one the 80 character
But not at the same time AFAIK. When you switch the mode the content what
was displayed in the mode before just froze on the other display.
--
Andreas
My random thoughts and comments
https://news-commentaries.blogspot.com/
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