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Re: Can the IIgs output colour on its composite monitor output?
- Subject: Re: Can the IIgs output colour on its composite monitor output?
- From: dempson@actrix.gen.nz (David Empson)
- Date: Tue, 19 Jun 2001 01:06:55 +1200
- Newsgroups: comp.sys.apple2
- Organization: Empsoft
- References: <nrFT6.111221$ff.834631@news-server.bigpond.net.au> <VRMT6.43715$DG1.7170463@news1.rdc1.mi.home.com> <PzNT6.113554$ff.847864@news-server.bigpond.net.au> <vqQT6.43951$DG1.7272617@news1.rdc1.mi.home.com> <N8RT6.113702$ff.849354@news-server.bigpond.net.au> <3b202ac5$1@news.uow.edu.au> <WA5U6.116029$ff.864351@news-server.bigpond.net.au> <3b26ac27$1@news.uow.edu.au> <nH9W6.132195$ff.992920@news-server.bigpond.net.au>
- User-agent: MacSOUP/2.4.2
- Xref: archiver1.google.com comp.sys.apple2:9190
ralmin <xbiber@bigpond.net.au> wrote:
> Well I can see the MC1377.
>
> My oscillators are:
>
> OC1 is 28.636360 MHz
> Y1 is 32.768 kHz
> Y2 is 3.686400 MHz
In case anyone was wondering what they are used for:
OC1 is the primary system oscillator, from which all the CPU and video
timing is derived. (Divide by 2 to get 14M, divide by 4 to get 7M,
divide by 8 to get NTSC colour subcarrier, divide by 10 to get "fast"
speed of about 2.8 MHz, divide by 28 to get the standard "slow" Apple II
1.0227 MHz.)
Y1 is used by the real time clock and parameter RAM chip.
Y2 is used by the Zilog SCC as its baud rate clock (divide by 16 to get
230400, then all the other baud rates are fractions of this).