RE: Success - first hires graphics ;)

From: Baltissen, GJPAA (Ruud) <>
Date: Thu, 7 Sep 2017 06:26:54 +0000
Message-ID: <>
Hallo Christian,

> I thought the screen memory starts at 0008 too, because of the clear screen subroutine.
> But the first pixels on screen start at 0010.

I just wonder, pure curiosity, why the pixels start at 0010 and not 0000. Is it a 6845 thing?

Another question:  how were you able to mix graphics and text? I thought it was either this or that here. I know it is possible on the C64 using a program but you didn't mention it. 

The hardware looks quite simple so if the schematic is known, I'm going to build my self one. But I am thinking of one change: I will look if I can free up a memory range of at least 256 bytes somewhere, maybe even using the $Axxx range. Not having to change a register for every byte will speed up building a graphical image. Looking at Christian's blog it could save at least 25% of time.

Met vriendelijke groet / With kind regards, Ruud Baltissen

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