NEW MSX by TECNOBYTES

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By mars2000you

Enlighted (5036)

mars2000you's picture

22-01-2014, 23:32

VDP9918, 9938 and 9958 are retro-compatible, it's not the case of VDP9990 that has no any support for some MSX1 screens.

That's why I say it's not fully MSX compatible.

The additionnal screens supported by VDP9990 give a higher quality than screen 12, they can be compared to high quality PC graphical modes.

That's why I say it's 'exotic'.

Don't compare with other extensions .... MoonSound and other things you've indicated are fully compatible with the MSX system (at least MSX2 in some cases). Not the case of VDP9990 as you can't replace old VDP by this VDP while keeping the full compatibility.

For the rest, of course, emulation is not 100% perfect and there's still something to improve, but adding support for exotic things such as VDP9990 and LaserDisc is outside the intentions of the blueMSX team. You have openMSX for that and soon pseudoMSX (ask to BiFi, I don't know when it will be released). For your info, pseudoMSX, although based on openMSX, will come with improvements and an interface.

By luppie

Paladin (782)

luppie's picture

22-01-2014, 23:27

???
oO

By mars2000you

Enlighted (5036)

mars2000you's picture

22-01-2014, 23:29

luppie : it's an answer to Dreamerm42.

By Maggoo

Paragon (1161)

Maggoo's picture

23-01-2014, 02:08

This is getting a bit off Topic... but Mars your explanation is completely bogus. V9990 is another extension just like the Moonsound (BTW, both DO work on MSX2, even MSX 1). Try replacing the old PSG by an OPL4, it won't be compatible either.

I do understand the complexity to emulate the V9990 and the lack of motivation to implement it considering the limited number of software available. And I'm not criticizing BlueMSX, I really enjoy it and use it on a daily base, I'm not even asking for it to support the V9990. I just don't agree with the argument that it does not compare with other MSX extensions.

By msx fan finland

Champion (464)

msx fan finland's picture

23-01-2014, 05:36

hi. This is great. tell to me how to buy this new msx ?
Give to me more instructions too, when this can be bought?
Im very interested about all msx.

Im going to follow this project.
Mika

By msxegor

Master (184)

msxegor's picture

23-01-2014, 09:50

I don't think there are many programs using that. At least unique and useful ones. In fact I know only one.
Z280 is long gone, Z380 not that long, but also gone.
eZ80 is incompatible with MSX due to internal peripherials mapped in higher half of i/o port map where all standard MSX peripherials belong
A while ago there was an interesting Z80-copmatible Kawasaki CPU with 33 MHz clock and reduced cycles per command, but that is also gone I believe.
So we have in fact the following alternative:
- Fast Z80: full code and clock compatability, at 3,58 gives accurate timing. Max speed i believe is 21 MHz
- Z180: up tp 33MHz clock, faster operation, built-in DMA - but not cycle accurate even at 3,58 and missing 'undocumented codes'
- Soft core on a modern FPGA - clocks up to 60 MHz (maybe higher), code set may be extended, clock timing may be 100% when required and set to eg 1 clock per command for fast mode. The only disadvantage i see - low voltage signals.

By luppie

Paladin (782)

luppie's picture

23-01-2014, 10:48

mars2000you wrote:

luppie : it's an answer to Dreamerm42.

Mine was also an aswer to Dreamerm42.
I can understand a lot of 'stone coal english', but this was to much or I was to drunk Running Naked in a Field of Flowers

By AxelStone

Prophet (2450)

AxelStone's picture

23-01-2014, 11:35

msxegor wrote:

I don't think there are many programs using that. At least unique and useful ones. In fact I know only one.
Z280 is long gone, Z380 not that long, but also gone.
eZ80 is incompatible with MSX due to internal peripherials mapped in higher half of i/o port map where all standard MSX peripherials belong
A while ago there was an interesting Z80-copmatible Kawasaki CPU with 33 MHz clock and reduced cycles per command, but that is also gone I believe.
So we have in fact the following alternative:
- Fast Z80: full code and clock compatability, at 3,58 gives accurate timing. Max speed i believe is 21 MHz
- Z180: up tp 33MHz clock, faster operation, built-in DMA - but not cycle accurate even at 3,58 and missing 'undocumented codes'
- Soft core on a modern FPGA - clocks up to 60 MHz (maybe higher), code set may be extended, clock timing may be 100% when required and set to eg 1 clock per command for fast mode. The only disadvantage i see - low voltage signals.

Perhaps fast Z80 is the best option to get a fully compatible MSX.

By o.geerdink

Champion (489)

o.geerdink's picture

23-01-2014, 11:45

By Dreamerm42

Hero (617)

Dreamerm42's picture

23-01-2014, 12:19

The tecnobytes is good idea... Smile

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