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Screen Modes (Rev #11)

Programmer's Reference Manuals

» Screen Modes

Screen Modes

Mode	Col x Row	Resolution	Colours	Memory	0	1	2	3	4	5	8
					Monitor Type
0	80 × 32	640 × 256	2	20K	*	*	-	*	*	-	-
1	40 × 32	320 × 256	4	20K	*	*	-	*	*	-	-
2	20 × 32	160 × 256	16	40K	*	*	-	*	*	-	-
3	80 × 25	Text only	2	40K	*	*	-	*	*	-	-
4	40 × 32	320 × 256	2	20K	*	*	-	*	*	-	-
5	20 × 32	160 × 256	4	20K	*	*	-	*	*	-	-
6	40 × 25	Text only	2	20K	*	*	-	*	*	-	-
7	40 × 25	Teletext	16	Varies¹	*	*	-	*	*	-	-
8	80 × 32	640 × 256	4	40K	*	*	-	*	*	-	-
9	40 × 32	320 × 256	16	40K	*	*	-	*	*	-	-
10	20 × 32	160 × 256	256	80K	*	*	-	*	*	-	-
11	80 × 25	640 × 250	4	40K	*	*	-	*	*	-	-
12	80 × 32	640 × 256	16	80K	*	*	-	*	*	-	-
13	40 × 32	320 × 256	256	80K	*	*	-	*	*	-	-
14	80 × 25	640 × 250	16	80K	*	*	-	*	*	-	-
15	80 × 32	640 × 256	256	160K	*	*	-	*	*	-	-
16	132 × 32	1056 × 256	16	132K	*	*	-	-	-	-	-
17	132 × 25	1056 × 250	16	132K	*	*	-	-	-	-	-
18	80 × 64	640 × 512	2	40K	-	*	-	-	-	-	-
19	80 × 64	640 × 512	4	80K	-	*	-	-	-	-	-
20	80 × 64	640 × 512	16	160K	-	*	-	-	-	-	-
21	80 × 64	640 × 512	256	320K	-	*	-	-	-	-	-
22	96 × 36	768 × 288	16	108K	*	*	-	-	-	-	-
23	144 × 56	1152 × 896	2	126K	-	-	*	-	-	-	-
24	132 × 25	1056 × 256	256	264K	*	*	-	-	-	-	-
25	80 × 60	640 × 480	2	37.5K	-	*	-	*	*	*	-
26	80 × 60	640 × 480	4	75K	-	*	-	*	*	*	-
27	80 × 60	640 × 480	16	150K	-	*	-	*	*	*	-
28	80 × 60	640 × 480	256	300K	-	*	-	*	*	*	-
29	100 × 75	800 × 600	2	58.6K	-	*	-	-	*	-	-
30	100 × 75	800 × 600	4	117.2K	-	*	-	-	*	-	-
31	100 × 75	800 × 600	16	234.4K	-	*	-	-	*	-	-
32	100 × 75	800 × 600	256	468.8K	-	*	-	-	*	-	-
33	96 × 36	768 × 288	2	27K	*	*	-	-	-	-	-
34	96 × 36	768 × 288	4	54K	*	*	-	-	-	-	-
35	96 × 36	768 × 288	16	108K	*	*	-	-	-	-	-
36	96 × 36	768 × 288	256	216K	*	*	-	-	-	-	-
37	112 × 44	896 × 352	2	38.5K	-	*	-	-	-	-	-
38	112 × 44	896 × 352	4	77K	-	*	-	-	-	-	-
39	112 × 44	896 × 352	16	154K	-	*	-	-	-	-	-
40	112 × 44	896 × 352	256	308K	-	*	-	-	-	-	-
41	80 × 44	640 × 352	2	27.5K	-	*	-	*	*	-	-
42	80 × 44	640 × 352	4	55K	-	*	-	*	*	-	-
43	80 × 44	640 × 352	16	110K	-	*	-	*	*	-	-
44	80 × 25	640 × 200	2	15.7K	-	*	-	*	*	-	*
45	80 × 25	640 × 200	4	31.3K	-	*	-	*	*	-	*
46	80 × 25	640 × 200	16	62.5K	-	*	-	*	*	-	*
47	45 × 60	360 × 480	256	168.75K	-	*	-	*	*	-	-
48	40 × 60	320 × 480	16	75K	-	*	-	*	*	-	-
49	40 × 60	320 × 480	256	150K	-	*	-	*	*	-	-
50	40 × 30	320 × 240	2	9.4K	*	*	-	*	*	*	-
51	40 × 30	320 × 240	4	18.8K	*	*	-	*	*	*	-
52	40 × 30	320 × 240	16	37.5K	*	*	-	*	*	*	-
53	40 × 30	320 × 240	256	75K	*	*	-	*	*	*	-

Mode numbers are categorised as below:

Mode	Use
0 – 63	Screen Modes provided natively by RISC OS
64 – 95	Third party applications (allocated centrally)
96 – 127	User defined modes

Notes

¹ Mode 7

The BBC Micro series of computers contained a dedicated teletext display chip which would generate the pixel data for a mode 7 screen. This meant that mode 7 only required enough memory necessary to store the character map (1KB of RAM).

Under RISC OS the teletext chip was replaced with a software emulation which performs on-demand conversion of the character map to a standard pixel-oriented framebuffer. The amount of memory required for this framebuffer will vary depending on the OS version and the video hardware capabilities; typically somewhere between 80KB and 640KB.

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