HW shortage ?

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By flyguille

Prophet (3028)

Аватар пользователя flyguille

15-08-2010, 22:04

or you can to do it optional, just inserting/removing a jumper, to disable that all feature, and use it as a plain slot expander.

by example, if the onboard memmapped is 512K, maybe the user has a 1MB memmaped, or 4MB memmaped. But for to use it, needs to disable the onboard memmaped.

By marlon-B

Expert (88)

Аватар пользователя marlon-B

15-08-2010, 22:15

or you can to do it optional, just inserting/removing a jumper, to disable that all feature, and use it as a plain slot expander.

by example, if the onboard memmapped is 512K, maybe the user has a 1MB memmaped, or 4MB memmaped. But for to use it, needs to disable the onboard memmaped.

just curious... but is there alot of software which uses 4MB of memory in a MSX? or more than 512k for that matter?

By flyguille

Prophet (3028)

Аватар пользователя flyguille

15-08-2010, 22:39

maybe right now, no, but we will see

By Yukio

Paragon (1540)

Аватар пользователя Yukio

15-08-2010, 22:44

The SRAM as Memory Mapper or megaROM is a nice tendency of newer hardware.
Hardware switch is a good choice.

As for the uses of Memory Mapper software, only video animation programs or loaders for megaROM games would use more than 512KB RAM ... It seems that the MSX would need a little more memory than the game itself, because of it the Memory Mapper to load games would be bigger.

GEM also uses a Memory Mapper to load megaROM games from GameBoy, but people would need a faster access RAM and even with this the external memory would be slower than the inner memory of a MSX Turbo R.

Maybe some newer game software or demonstration programs would benefit from more memory too.

By marlon-B

Expert (88)

Аватар пользователя marlon-B

15-08-2010, 22:46

different question:

I need to assign some (unused) IO ports for the different embedded hardware.

So read some documents that were floating around.

Am I right when I say that the range &H50 -> &h5F is still unused by any hardware ?

By edoz

Prophet (2391)

Аватар пользователя edoz

16-08-2010, 16:01

Slotexpander incl. ram or other extras will be nice i think. If the prise is not to high i realy want this Wink Wink

By Bastiaan

Champion (333)

Аватар пользователя Bastiaan

16-08-2010, 16:21

The nicely integrated function will compensate the loss of 1 slot for me (or add 1 I/O slot like on the Sunrise slot-expander?). A jumper option sounds like an easy improvement (1 for RAM, 1 for SD, etc.).
Is the SD compatible with the one from Erikie/ sinfox /sharksym?

http://members.quicknet.nl/evanson/Page/MMC/start.html
http://translate.google.com/translate?js=n&prev=_t&hl=nl&ie=UTF-8&u=http%3A%2F%2Fsharksym.egloos.com%2F4422743&sl=ko&tl=en&history_state0=ko|en|

Any pics of your project?

By marlon-B

Expert (88)

Аватар пользователя marlon-B

16-08-2010, 18:07

The nicely integrated function will compensate the loss of 1 slot for me (or add 1 I/O slot like on the Sunrise slot-expander?). A jumper option sounds like an easy improvement (1 for RAM, 1 for SD, etc.).
Is the SD compatible with the one from Erikie/ sinfox /sharksym?

http://members.quicknet.nl/evanson/Page/MMC/start.html
http://translate.google.com/translate?js=n&prev=_t&hl=nl&ie=UTF-8&u=http%3A%2F%2Fsharksym.egloos.com%2F4422743&sl=ko&tl=en&history_state0=ko|en|

Sorry will not be compatible with that design.
I have a complete different approach. The communication with the SD-card will be handled by a separate controller.
Which will fill a buffer with the requested data or write from this buffer. This buffer will be memory mapped(that's also why a slot had to be sacrificed). So the speed will be determined by how fast the MSX can do LDIR's.
Also this approach allows support for cards up to 16GB(or more).

I will release a modified dos2.4 version to boot from it. I already have the source-code.
A driver will also be available for dos and basic to read and write from it.

Any pics of your project?
As soon as the first full embedded design is completed I will post some pics.
Right now I only have a standard slot-expander prototype.

By marlon-B

Expert (88)

Аватар пользователя marlon-B

16-08-2010, 18:14

Slotexpander incl. ram or other extras will be nice i think. If the prise is not to high i realy want this Wink Wink

I'll keep it as low as I can.

it's a fun project for me.

And would be nice if people would use my hardware for the next 25 years of the never ending story of MSX.

so dont worry about high pricing.

By Bastiaan

Champion (333)

Аватар пользователя Bastiaan

16-08-2010, 21:13

any chance of adding (emulated or new-old-stock) SCC sound into the design? (would save me another slot) LOL!Running Naked in a Field of Flowers

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