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Robotrontechnik-Forum » Technische Diskussionen » LLC1 » Themenansicht

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000
19.04.2009, 20:32 Uhr
Micko

Hello all,

First sorry for writing in English, but I think it is better then to use some bad online translation tool in this case.

I am currently working on emulation of few DDR machines, and one of them is LLC1, if anyone have schematics of it or some more technical detail it would be great.

Things I know so far are :

monitor is located 0x0000 - 0x07fff
basic rom is located 0x0800 - 0x13ff
RAM 0x1400 - 0x1bff
video ram 0x1c00 - 0x1fff

video output is 64 x 16 chars.

on ports 0xec - 0xef Z80PIO is located
on ports 0xf8 - 0xfb Z80CTC is located

after initial boot, monitor is waiting for some interrupt in infinite loop, assume it is generated by CTC but not sure, so that is why I need schematics, or if someone have scan of Funkamateur (january 1985), that would be great.

Thanks,
Micko

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001
19.04.2009, 22:18 Uhr
jmueller

Hi Micko,

> I am currently working on emulation of few DDR machines...
Not bad, but why do you do it? What is your motivation?

> ...and one of them is LLC1
Why LLC1? This machine was replaced by the LLC2 very soon,
a much improved computer,
so the LLC1 was not often build.

> Things I know so far are...
> ...
You think right.
Here you can download the original functional description (67 MByte):
http://www.jens-mueller.org/tmp/llc1.pdf
Sorry for the bad scan!
There is no better one available. :-(

The LLC1 has a 7 segment LED display and a charcater screen output (64x16).
Also there is a hexadecimal keyboard and an alphanumeric keyboard.
The monitor program works with the 7 segment display and the hex keyboard.
But some output (f.e. register contents on reaching a breakpoint)
is done on the screen.
Pressing a hex key is firing an interrupt via ctc, that's right.

The tiny basic works with character screen output and the alphanumeric keyboard only.

It is not easy to write a LLC1 emulator because the very rar information.
Also I don't know anyone who has a working LLC1 on his own.
But I had already implemented a LLC1 emulation in my multi emulator JKCEMU,
that is working well.
But still I have not published this version of my emulator.
Maybe in 2 or 3 weeks it will happen.

If you have more questions, don't hesitate to ask here.
Good luck!

Jens

Dieser Beitrag wurde am 19.04.2009 um 22:31 Uhr von jmueller editiert.

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002
19.04.2009, 22:34 Uhr
Micko

Hi Jens,

Thanks for your answer.
My motivation is to add some old and forgoten machines in MESS project and help preserve software for them.

Things that I have done so far can be found at : http://micko-wip.blogspot.com/

Before you have sent answer I have tried to hack boot procedure and start basic right away, on my blog you can see screen of it.

Thanks again,
Micko

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