27 Feb
2010
27 Feb
'10
6:40 p.m.
Johnny Billquist wrote:
Another possibility is an I2S of some flavour. My model 70 and model 75
machines have a 512*512 displayed resolution, and 24 bit colour (or in
one case 30 bit colour). Agian you had multiple byteplanes which you
could combine in all sorts of ways.They had a fairly simple parallel host
interface, I have the Unibus card, there were others made to link to
HP2100, DG Nova,etc. And an iterface converter that linked to a DR(V)11-W
type of port.
Unlike the Grinell, I do have some documentation, including schematics.
Just as well, my 70/E has 6 byteplanes (it could have up to 12 with 2
more memory crates...). It conainst over 3000 4K DRAM chips (it's not
3072, it's even more than that) and about as many TTL devices...
-tony
It might be that the graphic system have a color
palette then, since
obviously, there are other colors than blue possible, but none others
are shown there.
Or else they have a 24 bit pixel depth, which would be very impressive.
Our grinell had more than one buffer, and you could do operations
between them too.