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| From: Zarko Zivanov
Date: 2000-07-04
Subject: Re: HW Q
|
I can answer you on some questions about C64:
> 1: what power supply does a c64 or plus/4 need?
C64 needs 9V AC and 5V DC power supply.
> 2: are there (I suppose yes (sound IC..)) some timer/
> counter circuits?
Two CIA (<something> interface adapter) chips.
> 3: if yes, how many channels does it have? I need
> two (3 is better) counters w/ external trigger signal
> possibility, and at least one programmable timer channel.
> what is the minimal time interval of the timer, and how
> many bits do they (timer/counter) count on?
Each CIA has 2 timers (16bit, as I remember), and one CIA can be triggered with external signal (or maybe both).
I'm not sure about minimal time interval, but i wouldn't be too optimistic about this.
> What are the details?
Try these sites and files:
http://www.hut.fi/Misc/cbm/docs/
http://www.funet.fi/pub/cbm/documents/index.html http://www.funet.fi/pub/cbm/documents/chipdata/6526.zip http://www.funet.fi/pub/cbm/documents/chipdata/6526cia.zip I don't remember all the details, but I hope you can find something there.
> 4: are these trigger/clk lines available from the
> expansion slot or via user port? are they standard
> TTL level?
They are available on some port, but I don't remember which.
Signals are standard TTL.
> 5: can I program the timer/counter to generate
> interrupts, and can these interrupts be vectored ones?
Yes, yes.
I have a lot of documentation on C64 in electronic form, and if you want I can e-mail it to you, but only after one or two weeks from now (I have exams at faculty, and I must find it first; it is on a CD, but i don't know which and what is the name of a file).
Best regards,
Zarko mailto:zzarko@uns.ns.ac.yu
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