(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)
|
MODE 99 is high-resolution screen MODE supported by the VideoNuLA
hardware, selectable with the VideoNuLA ROM.
The MODE 99 code adapts the MODE 3 screen, adding extra colour bits to provide a
5-colour version of MODE 3, 80 × 25 characters in 5 colours.
'MODE 99 (&60+3)'
| Type
|
Bitmapped
|
| Resolution
|
Text
|
40 × 32 characters
|
| Graphics
|
|
| Character size
|
6 × 8 pixels
|
| Pixel aspect
|
1:1 (square)
|
| Bits per pixel
|
4
|
| Default palette
|
Logical colour
|
Actual colour
|
| 0
|
0 (black)
|
| 1
|
1 (red)
|
| 2
|
2 (green)
|
| 3
|
3 (yellow)
|
| 4
|
7 (white)
|
| Memory
|
allocated
|
16384 bytes
|
| on screen
|
16000 bytes
|
| Address range
|
Model B etc.
|
&3000..&7FFF
|
| Configuration
|
Video ULA control register
|
|
| Video ULA palette register file
|
|
| CRTC register file
|
|
|
|
References
Jgharston (talk) 21:18, 17 February 2020 (CET)
