retrocanada76
Posts: 1
Joined: Sat Sep 15, 2018 7:53 pm

Bondwell 2 Fixes

Sat Sep 22, 2018 8:09 pm

Hello, I am new in this forum.

I found out some issues with Bondwell 2 (bw2 driver) and I have fixed it locally but I don't know how to submit or where to propose the changes.

If you run the bw2 driver it will not allow you to save anything (BDOS sector error) and the ramcard is not working. After studying the schematics and documentation from the service manual (http://www.thebattles.net/bondwell) I found out:

- The floppy drive protection bit (PPIC - 7 bit) is reversed. The floppy is protected when it's low.

-The ramcard rom is always be enabled by RAM2 low. There is no other enable/disable logic

-The rambanks on the ramcard are active when RAM5 is low and you have wrote at once to the port x30-x3f (slot signal) the bit 7 on flip flop (en) is VCC connected, ~slot will kick the flip-flop

After these changes the bw2 works beautifully and the ramcard boots and formats the 512KB ramdrive.

In the webpage above there is a custom bios / custom ramcard. I have added them and they work but must be set together but I don't know what is the stance on mess for custom roms. Also I don't know how to set a configurable rom for the ramcard. Should I create a new expansion called ramcard_custom ?

Thanks

Retrocanada

User avatar
Robert
Posts: 63
Joined: Thu Nov 06, 2014 12:44 pm
Location: Land of Oz
Contact: Website

Re: Bondwell 2 Fixes

Fri Sep 28, 2018 5:25 am

You create a Pull Request (PR) in the Github repo of MAME.

If it passes the once-over, someone will merge it into mainline.

If you're adding roms that are not easily located, you must provide them.

User avatar
Robert
Posts: 63
Joined: Thu Nov 06, 2014 12:44 pm
Location: Land of Oz
Contact: Website

Re: Bondwell 2 Fixes

Fri Oct 12, 2018 12:11 am

Looks like another case of lost useful code.

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