CT1024, was VCF 3.0 ANNOUNCEMENT:

From: Dave Dameron <ddameron_at_earthlink.net>
Date: Sun May 23 10:24:40 1999

At 10:29 PM 5/22/99 -0400, Allison wrote:
><So I would be penalized for getting my SWTPC CT-1024 video terminal to wor
><and enter it? First I changed the number of characters/ line from 32 to 64
>
>Common mod, mine has it too.

Mine wasn't the most neat, ic's soldered on top of others, etc.
>
><Then I added a cassette "bit bopper" to it. I found the 60Hz line sync
>
>BIT boffer, Kilobaud. common enough and aimed at CT1024.

I built the Bit Boffer from the March 1976 Byte. It was my second cassette
interface. The first was just a keyed tone, at about 110 baud. The third
was a Processor Tech CUTS. Missed the Kilobaud issues, but the same circuit
may still be in the back of Don Lancaster's CMOS cookbook. The UART from
the bit boffer got recycled into a serial interface for it, at 1200 baud.
>
>The 60hz sync was a component problem and once the offending pot and cap
>were replaced I found it to be very stable.
>
Were these the timing components for the 555 running at 15,840kHz? Pot. =
R38 and timing cap C16= 1nF? Were they out of tolerance for this frequency
or something else? My display was stable without 60Hz "sync" input and
moved around at about 1Hz with the input.

>likely forgot how to turn it on. ;)
>
Wish it were something so simple :).
-Dave
Received on Sun May 23 1999 - 10:24:40 BST