Serguei2 Posted July 16, 2020 Share Posted July 16, 2020 Does Thexder use screen mode 3? It looks low resolution to me for a Colecovision game. Quote Link to comment Share on other sites More sharing options...
opcode Posted July 16, 2020 Share Posted July 16, 2020 No, mode 2. You realize mode 3 is 64x48 right? Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
Serguei2 Posted July 16, 2020 Author Share Posted July 16, 2020 Thanks. Quote Link to comment Share on other sites More sharing options...
zyzzle Posted July 17, 2020 Share Posted July 17, 2020 Please give a super-quick list of the modes. I think they're 256x192, 64x48 and 40x24 (text mode). Is this correct? Quote Link to comment Share on other sites More sharing options...
opcode Posted July 17, 2020 Share Posted July 17, 2020 Just now, zyzzle said: Please give a super-quick list of the modes. I think they're 256x192, 64x48 and 40x24 (text mode). Is this correct? Well, TMS9918 is a tile based video. So even 256x192 is 32x24 tiles. You get two variations of that mode. One is 256 tiles max, two colors per tile, but each group of 8 tiles share the same 2 colors. The mode most used in games is a little more complex. 256 tiles per screen "third", so 3 sets of 256 tiles per screen. Also, each tile can use two colors per pixe row, and since a tile is 8x8 pixels, that means 8 pixel rows, or 16 colors per tile. Quote Link to comment Share on other sites More sharing options...
zyzzle Posted July 17, 2020 Share Posted July 17, 2020 Ah.. OK a little more complicated than I thought. I erroneously thought there was only one tiled mode, one text mode, and one 1:1 bitmapped mode. But, thinking about it a 256x192, some of the title screens and art on CV sure had me fooled. Quote Link to comment Share on other sites More sharing options...
Serguei2 Posted July 17, 2020 Author Share Posted July 17, 2020 9 minutes ago, zyzzle said: Ah.. OK a little more complicated than I thought. I erroneously thought there was only one tiled mode, one text mode, and one 1:1 bitmapped mode. But, thinking about it a 256x192, some of the title screens and art on CV sure had me fooled. I thought Thexder uses 128x192 somehow. Quote Link to comment Share on other sites More sharing options...
youki Posted July 17, 2020 Share Posted July 17, 2020 (edited) 6 hours ago, Serguei2 said: I thought Thexder uses 128x192 somehow. It uses Mode 2 , 256x192 , but It is possible the tile patterns are designed in a way it looks like 128x192 to ease the horizontal scrolling. I did not run Thexter recently but i guess it scroll horizontally per step of 4 pixels each time? if not, it could be it was planed at the beginning but not implemented. that would explain the 128x192 aspect. Edited July 17, 2020 by youki Quote Link to comment Share on other sites More sharing options...
Serguei2 Posted July 17, 2020 Author Share Posted July 17, 2020 6 hours ago, youki said: It uses Mode 2 , 256x192 , but It is possible the tile patterns are designed in a way it looks like 128x192 to ease the horizontal scrolling. I did not run Thexter recently but i guess it scroll horizontally per step of 4 pixels each time? if not, it could be it was planed at the beginning but not implemented. that would explain the 128x192 aspect. Does SGM support smoother scrolling? Or programming tricks? Quote Link to comment Share on other sites More sharing options...
youki Posted July 17, 2020 Share Posted July 17, 2020 the SGM add nothing to the colecovision except more RAM and a new sound chip. For smooth scrolling it is just porgramming tricks. However having more RAM can ease the programming of these tricks. Quote Link to comment Share on other sites More sharing options...
artrag Posted July 18, 2020 Share Posted July 18, 2020 (edited) It scrolls at 8 pixels steps One tile at time All tiles are 8x8 in mode 2, i.e. two colors per line out of 15 Edited July 18, 2020 by artrag Quote Link to comment Share on other sites More sharing options...
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