*Finally* do it yourself MSX (GR8BIT) released

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Par Eugeny_Brychkov

Paragon (1226)

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18-08-2011, 09:29

Guys, if you get the license for GR8BIT, you'll have all the information you wish about its design and how it works.
@PingPong: it is access time sharing between CPU and VDP.

Par PingPong

Prophet (3997)

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18-08-2011, 11:35

@PingPong: it is access time sharing between CPU and VDP.
@eugeny: and this time sharing can cope with a full 20mhz z80 without wait states?

Par Eugeny_Brychkov

Paragon (1226)

Portrait de Eugeny_Brychkov

18-08-2011, 13:49

@PingPong: it is access time sharing between CPU and VDP.
@eugeny: and this time sharing can cope with a full 20mhz z80 without wait states?

What do you want to hear from me? It will work with Z80 at 20MHz.
How fast it is depends on the application. If you will have ideas how to improve existing DVMA, and I see you will have Smile , I will be more than happy to review and ceritfy that for GR8BIT.

Par PingPong

Prophet (3997)

Portrait de PingPong

18-08-2011, 16:45

@PingPong: it is access time sharing between CPU and VDP.
@eugeny: and this time sharing can cope with a full 20mhz z80 without wait states?

What do you want to hear from me? It will work with Z80 at 20MHz.
How fast it is depends on the application. If you will have ideas how to improve existing DVMA, and I see you will have Smile , I will be more than happy to review and ceritfy that for GR8BIT.

@eugeny:
don't misunderstand me, please Big smile , i'm sure it will work....
my question is only, if a z80 is running at 20mhz, a single T-State is only 50ns.
i'm only guessing how your time sharing scheme 'allocate' time slots, and if it's wait-state free with the z80@20mhz (speaking about DVMA of course)

And a little OT question:
i'm interested to acquire a personal licence (end-user), but on the site i've not found pricing. what about?

Par Eugeny_Brychkov

Paragon (1226)

Portrait de Eugeny_Brychkov

18-08-2011, 19:56

@PingPong: it is access time sharing between CPU and VDP.
@eugeny: and this time sharing can cope with a full 20mhz z80 without wait states?

What do you want to hear from me? It will work with Z80 at 20MHz.
How fast it is depends on the application. If you will have ideas how to improve existing DVMA, and I see you will have Smile , I will be more than happy to review and ceritfy that for GR8BIT.

@eugeny:
don't misunderstand me, please Big smile , i'm sure it will work....
my question is only, if a z80 is running at 20mhz, a single T-State is only 50ns.
i'm only guessing how your time sharing scheme 'allocate' time slots, and if it's wait-state free with the z80@20mhz (speaking about DVMA of course)

And a little OT question:
i'm interested to acquire a personal licence (end-user), but on the site i've not found pricing. what about?
Ok, I see - thank you for clarification. There could be several designs of DVMA. I use the one which will work at any CPU speed, and it uses wait states while synchronizing with VDP. It is not quick, but it is reliable - both for reads and writes.
That's not OT. Did you try to contact me by email for this information, didn't you? :)

Par OeiOeiVogeltje

Paragon (1421)

Portrait de OeiOeiVogeltje

18-08-2011, 20:00

yeah
pricing?

Par Eugeny_Brychkov

Paragon (1226)

Portrait de Eugeny_Brychkov

19-08-2011, 08:58

yeah
pricing?

Send me email. You can talk about pricing afterwards with each other to find out that I have consistent GPL, but I do not want my pricing to be available to the internet so far.

Par Eugeny_Brychkov

Paragon (1226)

Portrait de Eugeny_Brychkov

28-11-2011, 21:52

PS/2 keyboard microcontroller code and executable is developed and released.

Storage subsystem microcontroller and Z80 code and executable are developed and released (1.44M diskettes - standard [1 sector per cluster, 9 FAT sectors] and compatible [4 sectors per cluster, 3 FAT sectors]). So now you can boot GR8BIT and work in DOS/DISK BASIC using supplied controller.

Visit my website for updated information on pricing and licensing.

For those who are still curious and/or hesitant about licensing - I supply MSX license from Mr. Nishi with GR8BIT platform.

Par Varaktori

Resident (60)

Portrait de Varaktori

12-12-2013, 20:09

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