DEC Professional 380, TMS and EBO questions

Paul Koning paulkoning at
Tue Apr 12 08:32:43 CDT 2016

> On Apr 12, 2016, at 2:28 AM, Pontus Pihlgren <pontus at Update.UU.SE> wrote:
> On Tue, Apr 12, 2016 at 07:23:22AM +0200, Camiel Vanderhoeven wrote:
>> On Mon, Apr 11, 2016 at 10:42 PM, Pontus Pihlgren <pontus at> wrote:
>>> 1. Without the Extended Bitmap Option (EBO) is it posdible to display color?
>>> Perhaps at the lower resolutions?
>> No, the green and red video signals are generated by circuitry on the
>> EBO. Without the EBO there's only one video signal generated.
> I suspected that. What about shades of grey?

No.  You can find all this in the Pro300 series technical manual, on Bitsavers.  The base video module is one plane, so black/white only.  The EBO module adds two more planes.


More information about the cctalk mailing list