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7.3728MHz / 115200 baud
3.6864MHz / 57600 baud
1.2288MHz / 19200 baud
614.4KHz / 9600 baud
307.2KHz / 4800 baud
153.6KHz / 2400 baud
76.8KHz / 1200 baud
There is also a "slow clock" using a simple 555 circuit that gives a clock rate that can be varied between about 4.6kHz and around 1.25Hz (not a typo: Hz - not kHz) and a push button for single stepping.--
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The terminal is 80's vintage and until about 3 years ago it was the main HMI interface on operational production equipment (a coil steel cut-to-length line). I maintained the machine and salvaged the terminal and documentation when the machine was decommissioned.
I bought my RC2014 specifically to get it operational again.
There is almost no information about the VP3301 on line. I have included a crappy .pdf scan of
the user manual in my Github repository for this project. I've seen them on ebay now and then at stupid prices.
The terminal
features an early membrane keyboard, 8 bit sound and a composite video output in
NTSC format. Interfacing is RS232 or 4-20mA. Maximum baud rate is 19200 and it needs hardware flow control for anything over 1200 baud, so I had to do some additional hacking to the Serial IO board to break out the CTS signal on the ACIA through the MAX232. This will be included in the write up.
Unfortunately, its hardwired 7 data bits, not 8. I've got around this by setting the parity bit to space (7S1) which seems to pad it out enough to do the trick for plain text with the RC2014 (8N1) but I suspect will limit or prevent the use of control characters. I've not tried yet.