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Re:Inside an Official GameBoy Dev Cartridge by tsomctl on Wednesday June 17, 2015 @07:52PM (#9735989)
So how did Nintendo intend you to program this? I believe their official sdk ran on DOS, so was there a ISA card that let you program this?
Re:Inside an Official GameBoy Dev Cartridge by interwho on Wednesday June 17, 2015 @08:34PM (#9736118)
From the site of the company that makes most of Nintendo's dev equipment, there was a gang writer that the cartridge plugged into.

https://intsys.co.jp/english/tools/index.html

Re:Inside an Official GameBoy Dev Cartridge by bananaboy on Wednesday June 17, 2015 @08:36PM (#9736120)
There was a cartridge programmer that you plugged the cart into.