nitrofurano Posted May 24, 2014 Share Posted May 24, 2014 hi everyone! i updated http://nitrofurano.altervista.org/retrocoding/colecovision/ the examples i have there is those .asm from Daniel Bienvenu, and i kept it almost pristine, meaning only with some small adaptations for making them compilable from Boriel's ZX-Basic Compiler and since there are no working Basic examples yet, and i want to start something, i'm needing some technical information - since, for now, i want to avoid using Bios, and i want to have working what i have from the sg1000 side, what are exactly the i/o ports used on ColecoVision? for example, sg1000 uses the ports $bf (address, vdp register) and $be (data) for tms9918 display and btw, should we always set the stack point to the address $7FFF at the code start? (since Boriel's ZX-Basic Compiler uses stack a lot on the functions and routines) thanks! Quote Link to comment Share on other sites More sharing options...
nitrofurano Posted May 24, 2014 Author Share Posted May 24, 2014 btw, i guess that the ports $bf and $be from sg1000 are $a1 and $a0 on colecovision? Quote Link to comment Share on other sites More sharing options...
+nanochess Posted May 24, 2014 Share Posted May 24, 2014 The video ports in Colecovision are $be for data and $bf for address (there others you can use, but use these for sake of standard) The PSG standard port in Colecovision is $ff (write only), also it's a SN76489 like the SG-1000 All this information is available in http://theadamresource.com/manuals/technical/ColecoVision%20Coding%20Guide.pdf Quote Link to comment Share on other sites More sharing options...
nitrofurano Posted May 24, 2014 Author Share Posted May 24, 2014 thanks! 1 Quote Link to comment Share on other sites More sharing options...
nitrofurano Posted May 24, 2014 Author Share Posted May 24, 2014 here is my first working example using Boriel’s ZX-Basic Compiler (not yet with halt for waitvbl, i'll try to implement it soon! ) - still very simple when compared with what i have available at nitrofurano.altervista.org/retrocoding/msx , but i think it can provide some idea of what can be possible to do example01z1c3_firsttest.zip Quote Link to comment Share on other sites More sharing options...
nitrofurano Posted May 24, 2014 Author Share Posted May 24, 2014 this one has a bug that i can't figure out what is happening - it is suppose to poke all the 16kb display area with random values, but it isn't... :S (about the .asm debug file generated by the cross compiler, it only counts after "defw $aa55" - the bash script crops out those 16 bytes before that) example01z1c5_vpoke_notworking.zip Quote Link to comment Share on other sites More sharing options...
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