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V9990 and VGA tradeoffs

by Eugeny_Brychkov on 21-02-2023, 18:19
Score: 189.35 %, Type: Forum topic , Comments: 2 comments
Would you be comfortable having VGA output, but missing interlaced and 424-line modes, and PAL 50 Hz mode? In other words - having progressive scan @ 60 Hz only? Can you elaborate a bit more? Can you elaborate a bit more? Are you perhaps ...

Is there any software built for V9990 for 50 Hz and interlaced modes?

by Eugeny_Brychkov on 11-02-2023, 21:00
Score: 188.69 %, Type: Forum topic , Comments: 3 comments
I read LCD flickers at 50 Hz. Interlaced modes are not supported, progressive scan modes only. Is there any sense making software for these modes? Or, slightly different, but related question - is support for 50 Hz mode and interlaced scan vital and ...

V9990 help needed - picture size mapping to VGA

by Eugeny_Brychkov on 10-02-2023, 09:56
Score: 188.39 %, Type: Forum topic , Comments: 0 comments
I am analyzing the V9990 datasheet . It has some very valuable information, some is missing, some must be guessed. At present I am trying to figure out how to map V9990 modes into the VGA timing. The most data intensive at RGB555 modes are ...

MSX keyboard layout - simultaneous key press

by Eugeny_Brychkov on 25-09-2022, 12:40
Score: 182.81 %, Type: Forum topic , Comments: 7 comments
https://en.wikipedia.org/wiki/Rollover_(key) I can't see the picture, by the way. pgimeno wrote: I think it is pgimeno ... in the Hardware forum more than here? One that often trips me up, One that often trips me up, if I type ...

CTRL-STOP is not caught (batch file)

by Eugeny_Brychkov on 13-07-2022, 23:58
Score: 180.27 %, Type: Forum topic , Comments: 3 comments
in particular: in a,(0aah) ... out (0aah),a *** in a,(0aah) dec a out (0aah),a To my understanding DEC A ... Update: for DOS1 writing 0ffh into 0f336h (input available) and 03h (break character) into the 0 ... "terminate batch file?". DOS2 seems not using these locations at all. Way to go: DOS1: 0f336 <- ...

News did not appear

by Eugeny_Brychkov on 26-06-2022, 08:04
Score: 179.79 %, Type: Forum topic , Comments: 7 comments
I submitted news several (5?) days ago. News do not appear. What is the time required for news to be moderated and posted onto the site? Is feedback from the team provided? Eugeny, to be honest I do not Eugeny, to be honest I do not know. ...

What is the right way to search for FM-Pak and its RAM?

by Eugeny_Brychkov on 03-10-2021, 20:47
Score: 171.81 %, Type: Forum topic , Comments: 42 comments
that "psycho.prg" writes 0 to $5ffe and $5fff. These actions corrupt GR8NET registers. While contents of $5fff can ... World does not work with GR8NET. My investigation shows that "psycho.prg" writes 0 to $5ffe ... the ROM is disabled when writing a value between 7FF0h and 7FFFh. gdx wrote: In fact, what I ...

YRW-801 analysis

by Eugeny_Brychkov on 09-02-2021, 16:34
Score: 165.18 %, Type: Forum topic , Comments: 4 comments
I am analysing the contents of the OPL4 ROM, and it seems I am missing something. There're instruments overlapping each other (316 to 330 overlap other instruments), and I calculated 626 kB of unused space (out of 2 MB), not related to any ...

Reset signal duration

by Eugeny_Brychkov on 03-10-2020, 08:07
Score: 162.13 %, Type: Forum topic , Comments: 5 comments
There must be a legitimate source detailing specification of the system reset timing. I am sure I have seen it somewhere, but can not find it (searched in MSX tech data book and in the net). Please help. Thank you! Reset timing: page 35 of ...

How to intercept hardware error handling under DOS2 in BASIC calling F37D

by Eugeny_Brychkov on 01-08-2020, 22:00
Score: 160.52 %, Type: Forum topic , Comments: 1 comment
checking F6C6 allowing minimum of 0a0h bytes free for the remaining stack (took this value from the BASIC ...
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