DP8350 (and DP8367)

[Tony Duell]

> 
> see the thread from 2003
> http://groups.yahoo.com/group/cosmacelf/message/1057
> 
> looks like this was a custom for HP

Well, I am not convinced it is totally custom, in that it has the DP8367 
number as well as the HP1820-xxxx number (nost totally custom chips only 
have the latter). I can well beleive it's a custom version of a standard 
CRT controlelr, perhaps for a different screen format or something.

Anyway, I did a little more poking isnide my HP120 today. I believe the 
DP8367 is closely related to the DP8350. Some of the pinouts machine up 
(and not just bovious ones [1]). The internal registers seem to be loaded 
in the same way _from the address lines_. It is connected to am 80 yte 
shift register chip (I forget the number, MM5035??). 

[1] For example, according to the HP125 boardswapper manual on 
hpmuseum.net, one of the output ports on the terminal processor (a Z80A) 
controls the 6 self-test LEDs and a line to the video controller to 
select 50Hz or 60Hz vertical frequency. I can find this output port (an 8 
it latch) on the the the terminal PCB, the bit that would set vertical 
freuqencty is linked to a pin on the video controller chip, indeed on the 
DP8350, that pibn does select vertical frequency)

Now, I can find _references_ to the DP8350 data sheet, but not the 
complete data sheet. Does anyone have that one?

-tony