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V9990 help needed - picture size mapping to VGA

by Eugeny_Brychkov on 10-02-2023, 09:56
Score: 194.01 %, 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: 188.42 %, 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 ...

CTRL-STOP is not caught (batch file)

by Eugeny_Brychkov on 13-07-2022, 23:58
Score: 185.88 %, 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 <- ...

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

by Eugeny_Brychkov on 03-10-2021, 20:47
Score: 177.43 %, 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: 170.8 %, 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: 167.74 %, 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: 166.13 %, Type: Forum topic , Comments: 1 comment
checking F6C6 allowing minimum of 0a0h bytes free for the remaining stack (took this value from the BASIC ...

SCC quality output problem in MG2 (and probably other software)

by Eugeny_Brychkov on 24-06-2020, 09:42
Score: 165.58 %, Type: Forum topic , Comments: 19 comments
< 9, the waveform gets stuck; When setting the on/off bit to 0, waveform goes 0. These ... is disabled) instead of immediately putting channel output wave value to 0. Test confirmed - wave goes to 0 when channel is disabled, and it is weird - I would logically expect that wave would be always 0 only ...

Default state of the GR8NET's built-in PSG

by Eugeny_Brychkov on 08-06-2020, 10:08
Score: 165.13 %, Type: Forum topic , Comments: 8 comments
By default, on power up, GR8NET's PSG is enabled at port A0 (standard MSX PSG port). I have ... for initialization at all (e.g. slot 1=game cartridge and slot 2=GR8NET) the PSG stays at port 0x10 not interfering ... time stereo GR8NET, at the power up, will still initialize its built-in PSG at port A0 mirroring ...

Making proper external mapper for Turbo-R

by Eugeny_Brychkov on 20-03-2020, 10:54
Score: 163.45 %, Type: Forum topic , Comments: 5 comments
that they insert 1 or 2 wait states for VDP access; GR8NET is able to detect this (0, 1, 2 or bigger). ...
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