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1993-04-08
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57 lines
Mode Resolution Frame VIDC Version Date Author
rate speed
---- -------- ----- ----- ---- -------- ------
Mode32 - 800x600 8bpp 2.5e 13/05/91
Mode32a - 800x600 8bpp 1.00 22/10/92 David Bilsby
Mode67 - 960x384 4bpp 78Hz 36MHz 0.18 27/02/89 Jonathan Roach
Mode110 - 1120x448 4bpp 55Hz 1.00 24/03/92 George Taylor
Mode118 - 1024x464 4bpp 60Hz 1.00 24/06/92 George Taylor
Mode120 - 896x344 1bpp 90Hz 36MHz 1.02 02/07/92 Paul Dellar
121 - 896x344 2bpp
122 - 896x344 4bpp
Mode124 - 1024x768 4bpp 36Hz 1.00 25/04/92 Matthias Sattler
Mode125 - 1024x640 4bpp 57Hz 50MHz 1.00 11/09/92 Matthias Sattler
Mode126 - 1280x512 4bpp 60Hz 50MHz 1.00 11/09/92 Matthias Sattler
Notes
-----
A VIDC enhancer is required for at least those modes shown as having a VIDC
speed of 36MHz.
From: Owen Smith (/G=Owen/S=Smith/O=SJ-Research/ADMD=INTERSPAN/C=GB/@mhs-relay.ac.uk)
Mode67 is a 78Hz frame rate 36Mhz mode, 16 colours oblong pixels. It works
well with the Eizo 9060 and other multisyncs as a day to day programming
mode - reasonable screen area and no trace of flicker whatsoever. It really
kills 8MHz memory ARM2 systems though - takes half the memory bandwidth.
The Mode120 module provides modes 120, 121 and 122. These are exactly the
same as modes 37, 38 and 39 except that they run the VIDC at 36 rather than
24 MHz. This give a frame rate of 90Hz rather than the usual 60Hz. 60Hz might
sound high enough, but mode 122 looks a lot better on an Acorn Multisync than
mode 39 does - maybe the phosphor has a fairly low persistence.
From: Matthias Sattler (m_sattle@tangram.informatik.uni-kl.de)
Mode 124 can be used on A540 and A5000 but it will only have 36Hz picture
frequency. If clock your VIDC with 50 Mhz it will have 50Hz then (I tried
this and it worked fine except that 50Hz is still too flickery for me). If
you choose 60Mhz for your VIDC it will have 60Hz but my VIDC didn't do this
(as I wrote in my previous article).
From: George Taylor (gst@dcs.ed.ac.uk)
Mode110 runs at about 55Hz and I notice it flickers a bit, also it causes
my monitor to produce a slight high pitch (very high) whine when in use.
This whine can be stopped by slightly reducing the horizontal screen width.
Mode118 runs at 60Hz has more vertical height than 110 but slightly less
width. (this mode also takes slightly more RAM bandwidth than 110 but the
difference is fairly small).
From: bilsby@hermes.mod.uk (David Bilsby)
The Mode32a file is a mode 32 module which I did on my A5000 and NEC II
monitor. If anyone has any huge complaints about the alignment it has on
your monitor I may consider producing several versions with various offsets.