A dream or a hype ?

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By Haohmaru

Paladin (774)

Haohmaru의 아바타

31-07-2005, 15:06

Well, that was the point of my previous post - it's not making things any easier.

By Sama

Ambassador (2068)

Sama의 아바타

31-07-2005, 15:34

Nishi already spoke about standardizing certain OCM extenstions by acknowledging them as 'certified by MSX Assocation' (or something like that) during his lecture at MSX World 2005. The necessary VHDL to upgrade the OCM with the user-made VHDL extensions will become downloadable as well. However, as such VHDL can be written only after the OCM has been produced, details can only be thought about when the first VHDL appears.

By wolf_

Ambassador_ (9971)

wolf_의 아바타

31-07-2005, 16:16

Are you as a developer free to release/spread/propagandise extensions yourself, or do you *need* an MSXA certification? Because if this thing gets popular I could forsee that the 'scene' creates a better core than MSXA with better and way different extentions.. I dunno if MSXA likes that (for sake of conserving the MSX-'standard') ^_^

By snout

Ascended (15187)

snout의 아바타

31-07-2005, 16:18

Of course you don't -need- MSXA Certification. You don't need certification for releasing MSX software or hardware either, do you? Wink

By anonymous

incognito ergo sum (116)

anonymous의 아바타

31-07-2005, 17:01

Of course you don't -need- MSXA Certification. You don't need certification for releasing MSX software or hardware either, do you? Wink

That's right, but what about the fact that the extensions made by people need to be applied to MSXA VHDL code ? Do we have the right to modify and distribute the full VHDL code made by MSXA with our modifications or just a patch to the original code? That's why is so important to know which conditions apply to the VHDL code that comes with OCM...

btw, nice FAQ page. :-)

By anonymous

incognito ergo sum (116)

anonymous의 아바타

31-07-2005, 17:03

forgive me if I'm asking a stupid question, but I read somewhere that the FPGA runs at 21 mhz. You're saying that is possible to code a 100 mhz z80 with it. Can you explain that to me, I believe I need to learn more about processors in order to be able to see the advantages of OCM. :-)

By Latok

msx guru (3870)

Latok의 아바타

31-07-2005, 18:14

Well, the R800 runs on 7,14mhz, but it can be compared to a 28mhz z80....Probably, similar mathematics can be done to create a 100mhz z80 with a 21mhz fpga?

By Sonic_aka_T

Enlighted (4130)

Sonic_aka_T의 아바타

31-07-2005, 18:36

I doubt you can create a 100MHz Z80 on a 21MHz FPGA. I don't think we need a 100MHz Z80 though, we need a 100MHz VDP! Tongue

By Leo

Paragon (1236)

Leo의 아바타

01-08-2005, 21:01

On original Z80 few instructions executes in one cycle , actually a lot of them executes in 4 and more.
So if you make a Z80 with one instruction per cycle , its runs 4x faster at the same frequency.
R800 processors does this for a lot of Z80 instructions.

By MicroTech

Champion (385)

MicroTech의 아바타

03-08-2005, 13:09

I've just received MSX Mag 3: on page 114 there is an image of a portable PC running Quartus II and connected to a 1CM through a flat cable.
This is connected to PC parallel port (it is not visible but a window indicates ByteBlasterII (LPT1))
and to the 10 pins/FPGA connector of 1CM.

I imagine that this is the download cable:
It is not very complex and probably we could build it by ourselves...

I'm not very expert of hardware and FPGAs so I could be wrong but there is something
not very clear to me:

1) here:

says that:
"The One Chip MSX will come with an adapted version of MSX-DOS on SD card"

so should the package contain also an SD card?

2) here:

says that:
"The One Chip MSX will be delivered with the VHDL code that is used to achieve MSX1 compatibility"

I imagine that VHDL source code could take at least 1MByte, is it contained on SD-card? or perhaps on a CD-ROM?

3) I imagine that, at boot, FPGA will be loaded with a default contained in a serial EEPROM
(MSX Mag 3, page 108, item E)
Probably both MSXDOS-tool and FPGA cable will load this EEPROM with a different VHDL so at next boot the new configuration becames active.
If the new configuration hangs the machine or SD-card cannot be read anymore then cable is
necessary to rewrite EEPROM with original (MSX1) default.

Is this correct?


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