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CRTC

212 bytes removed, 11 November
/* Border conflict */
If R6=0 and VCC=0, we expect VBORDER to activate as VCC=R6 and we also expect VBORDER to deactivate as VCC=0. In this situation, all CRTCs activate VBORDER. On CRTC 1, even IBORDER is activated. But on CRTCs 0/2, the first raster line shows an alternation of bytes of VBORDER and displayable characters.
 
This behaviour exhibited by CRTCs 0/2 shows that, despite their 1MHz clock speed, they can change state at a rate equivalent to 2MHz chips by responding to both the rising and falling edges of each clock cycle.
To see the border bytes with your own eyes, type this BASIC line after reset:
Phi2x
8,999
edits
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