Video support

Sat Jan 10 1998, Andrew Savichev writes to All:

AS> Yes, and banal LDIR (not the entire screen, but its parts, and these are rotations
AS> around axes, compression/stretching, filling, etc.) Atmel AVR does

^^^^^^^^^
What a beast :)

AS> is much faster ;) The scheme will still have to be “broken”: firstly, you need

[.......]

AS> How
AS> really expand the colors, “remaining” in standard 6.5 K, I don’t
AS> guess

AS> Sincerely, Andrey S./CGS

AS> -+- ifmail v.2.10dev
AS> + Origin: Private Account (2:5020/400@fidonet)

$$$ With best wishes ... Alex

And at 6.5k we won’t “stay” - I used the standard screen for its intended
(almost) purpose, i.e. switching pixel color/attribute color; all
information about the color of the pixel lies in a separate RAM, information about the attribute is there
where it should be. To obtain 256, 8 standard Spectrum
screens (without attributes) are used with separate recording, but with simultaneous reading for
output on the screen (remember the PC, they almost also increase the number of colors
while maintaining compatibility), in general the information is not readable at the same time
(for 8 micros 573RU17 it is possible at the same time) because only two 62256 are used (
32k) and we had to use some tricks.

█▓▒░ ░▒▓█▓▒░ ░▒▓█▓▒░ ░▒▓█▓▒░ ░▒▓█▓▒░ ░▒▓█▓▒░ ░▒▓█▓▒░ ░▒▓█▓▒░ ░▒▓█▓▒░
█ Once upon a time, Sunday January 11 1998 19:43, Andrew Savichev
█ wrote for All:
...
[about AT90S8515]
...
AS> You will have to write the firmware yourself, but they are loaded into the
AS> internal 8K flash sequentially and you can upgrade your hardware
AS> at least every weekend ;) In general, from it on There are a lot of things you can do on the Spectrum
AS> - you pay once, but the thrill is multiple and the software for it is
AS> unlike Altera, it’s frivolous.
It’s a very interesting thing. I'll think about how it can be used. Judging by the characteristics, this coprocessor is more powerful than the Z80 and can provide strong acceleration.
Although, if you take ALTER, you can build a coprocessor at a higher
frequency. In Sprinter, the video controller has an internal frequency of 42MHz.
And the frequency is very important. Especially if you switch to SVGA monitors. There, according to my
calculations, the Sprinter video controller should operate at a frequency twice
higher, i.e. 84MHz.

░▒▓██ Best regards, Ivan. ██▓▒░

TR-DOS 5.04Ei

screen (without attributes) with separate recording, but with simultaneous reading for
output on the screen (remember the PC, on it they almost also increase the number of colors
while maintaining compatibility), in general, the information is not read simultaneously
(for 8 microphones 573RU17 can be done at the same time) because only two 62256 are used (
32k) and we had to use some tricks.

$$$ With best wishes ... Alex