RE: Success - first hires graphics ;)

From: vossi <*vossi_at_ceffy.de*> Date: Wed, 6 Sep 2017 23:41:23 -0700 (MST) Message-ID: <1504766483671-0.post@n4.nabble.com> · vossi_at_ceffy.de

@Ruud:
I will read the 6545 datasheet to better understand why the screen starts at
$0000.
...also I take a look at the IBM CGA adapter - it uses the same 6545 with
640x200  pixels graphics mode.

Mix-mode:
It seems like the board disables the char-rom, if there is a SPACE character
and reads the bytes from the graphics RAM. If a character is in screen
memory the character has priority!
All character-rom pins are wirde to the socket except pin21. Here it seems
to disable  the rom. This is CS3 at the 2316 rom but I have an 2716 eprom
and this has here VPP. OK, vpp should be at +5V normally, is the eprom
disabled with GND at VPP???

--
Sent from: http://cbm-hackers.2304266.n4.nabble.com/

       Message was sent through the cbm-hackers mailing list