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Update VT100 AVO documentation a bit (n/w)

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Lord-Nightmare 2015-05-01 14:04:24 -04:00
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src/mess/drivers/vt100.c
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@ -562,9 +562,11 @@ MACHINE_CONFIG_END
* The optional AVO character set roms (see below) have: pin 18: /CS2*; pin 20: /CS1; pin 21: CS3 hence they match a normal 2716
*(this is marked on the image as if it was CS2 but the input is tied to gnd meaning it must be /CS2)
* The AVO itself can hold up to four character set roms on it (see http://www.bitsavers.org/pdf/dec/terminal/vt100/MP00633_VT100_Mar80.pdf
* The AVO itself can hold up to four roms on it (see http://www.bitsavers.org/pdf/dec/terminal/vt100/MP00633_VT100_Mar80.pdf
and http://vt100.net/dec/ek-vt1ac-ug-002.pdf )
at least sixteen of these AVO roms were made, and are used as such:
and these roms can depending on jumpers be mapped at 0x8000, OR overlay the main code roms at 0x0000-0x1fff!
They may even allow banking between the main code roms and the overlay roms, I haven't traced the schematic.
At least sixteen of these AVO roms were made, and are used as such:
(based on EK-VT100-TM-003_VT100_Technical_Manual_Jul82.pdf)
* No roms - normal vt100 system with AVO installed
* 23-069E2 (location e21) - meant for vt100-wa and -wb 'LA120' 'word processing' systems (the mapping of the rom for this system is different than for the ones below)