How to use SD Mapper / Megaram 512K

By _EF_

Supporter (15)

_EF_'s picture

24-05-2019, 13:16

Dear All,
I have just bought SD Mapper / Megaram 512K card, inserted it.
I see `Slot 1: SDV1 - (26) PQI, Slot 2: Vazio` on the screen, after that it goes to Basic.
Please help me to understand, what files should I have put on SD card to play games.
The only one command that i remember from MSX Basic was `files`, but it shows nothing Smile
My SD card was formatted under Win10 with `FAT` option, I placed there several *.rom and *.dsk files. But how to play games? Sad

Also I'm a little bit confused about 2 switches on top of the card and how they affect Mapper/Megaram:
Off Off - Mapper/megaram desativada
Off On - Mapper/megaram desativada
On Off - Megaram ativada
On On - Mapper ativada
I am confused with such strange combinations - can't understand the meaning of each switch...

I wasn't able to find on Google any crash course of how to use SD Mapper, only info about some memory addresses, etc.

Any help appreciated.

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By Pentarou

Master (209)

Pentarou's picture

25-05-2019, 10:56

You need to format the card on the MSX, and put DOS (Nextor) in it, then it will boot to DOS.
Afterwards you copy the games and a loader (sofarun) to use them.

Quote:

I wasn't able to find on Google any crash course of how to use SD Mapper

The search function here sucks, read this thread:
About the switches: the one on the left disables the 512K.
When the RAM is enabled, the switch on the right changes between Mapper or Megaram.

By _EF_

Supporter (15)

_EF_'s picture

25-05-2019, 19:38

Thank you so much!
Your instructions in the linked thread are the wisest text about SD card mapper.

By Grauw

Ascended (8395)

Grauw's picture

25-05-2019, 21:36

It would be good service if buyers of these carts were provided with a manual and a getting-started disk image.

By OeiOeiVogeltje

Paragon (1296)

OeiOeiVogeltje's picture

26-05-2019, 21:35

indeed

By OeiOeiVogeltje

Paragon (1296)

OeiOeiVogeltje's picture

26-05-2019, 21:35

indeed

By _EF_

Supporter (15)

_EF_'s picture

27-05-2019, 06:44

No matter how i tried, i 'm still unable to do call fdisk. Actually it shows me the first screen:

Nextor disk partitioning tool
-----------------------------------
1. SDMaper Driver
    v1.0.4 on slot 2-1
ESC. Exit

I select 1
Then it goes

Nextor disk partitioning tool
-----------------------------------
SDMapper Driver on slot 2-1

and nothing more...

Does anyone have working SD card image to share?

I tried everything - changing slots, switches positions, deleting SD partitions, formatting them FAT16, even FAT12 under linux, writing NEXTOR.SYS, COMMAND2.COM. Tried SD cards 512M, 2GB, 4GB - no luck Sad

Appreciate any help

By Pentarou

Master (209)

Pentarou's picture

27-05-2019, 15:00

Nextor won't let you format the device you booted from.
There are two solutions to this problem:

1) Boot from other media (other cartridge or floppy disk)
2) At boot keep key "1" pressed until the basic prompt

Then do to the call fdisk.

By _EF_

Supporter (15)

_EF_'s picture

27-05-2019, 19:14

Pentarou wrote:

2) At boot keep key "1" pressed until the basic prompt
Then do to the call fdisk.

Thank you so very much! You saved my life again!