OCM: questions and answers

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By AuroraMSX

Paragon (1902)

AuroraMSX's picture

01-01-2008, 16:32

Guys,

Is there any way to save date / time in OCM or does it not emulate CMOS? I have to set time / date every time I boot up MSX-DOS2... Questionafaik, the clockchip (and/or its sram) is not emulated.

By timbr

Resident (43)

timbr's picture

02-01-2008, 09:23

The clock chip including the settings memory is emulated but looses it's data every time the power is switched off.

By coldbreeze

Expert (127)

coldbreeze's picture

02-01-2008, 23:37

That's what I feared Sad Thanks, guys!

By Prodatron

Paragon (1812)

Prodatron's picture

06-01-2008, 14:13

Is there an english documentation about the DIP switches available?

What I could understand so far is:
Dip1+2 = video output (00=?, 01=RGB 15KHz, 10=VGA 31KHz, 11=VGA 31KHz [?])
Dip3 = ??
Dip4 = Keyboard layout (0=Japanese, 1=English)
Dip5 = SD/MMC card (0=off, 1=on)
Dip6 = ?? (not used?)
Dip7 = ?? (not used?)
Dip8 = Wave sound (?)

Could someone complete/correct this list?

By Manuel

Ascended (18880)

Manuel's picture

06-01-2008, 14:30

Prodatron: http://msxbanzai.tni.nl/computers/1chipMSX.html

By the way: are you so busy that you can't make it to the Nijmegen fair on the 19th!??? ;(;(;(;(;(;(

By Prodatron

Paragon (1812)

Prodatron's picture

06-01-2008, 14:47

I registered about 20mins before Big smile
Thanx a lot for the link!
Btw, is it usual, that the Sunrise IDE interface doesn't work in the OCMs' 10MHz mode?

By Manuel

Ascended (18880)

Manuel's picture

06-01-2008, 15:05

Heh! Now I got it! Great! Smile

By Edwin

Paragon (1182)

Edwin's picture

06-01-2008, 15:24

I imagine that most external hardware will have problems with the high speed setting.

By AuroraMSX

Paragon (1902)

AuroraMSX's picture

07-01-2008, 19:25

The clock chip including the settings memory is emulated but looses it's data every time the power is switched off.That's a pretty piss poor emulation of the SRAM, then Tongue

By Alex

Master (205)

Alex's picture

07-01-2008, 23:27

The clock chip including the settings memory is emulated but looses it's data every time the power is switched off.That's a pretty piss poor emulation of the SRAM, then Tongue

The FPGA draws too much power to retain the data and keep the (emulated) real time clock running on a battery. To have this feature, a separate real time clock chip with some embedded SRAM should have been included in the hardware design (and a battery). Preferably the same RTC chip as was used in the earlier MSX2/2+/turboR models from the 80's and early 90's. Don't know why this was not done.

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