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trs80: implement Grid shim in video driver
Loading the grid subsystem on top of the TRS-80 driver, which is an interface to its ROM BIOS, would be counter-productive because the BIOS already has the concept of cursor. However, VE needs the Grid interface, so we implement a shim for it. Again, all this work (and the re-assembly that it entails) has been done from within Collapse OS on the TRS-80!
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@ -29,6 +29,8 @@ CODE AT-XY EXX, ( protect BC )
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EXX, ( unprotect BC ) ;CODE
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( ----- 604 )
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: LINES 24 ; : COLS 80 ;
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: XYMODE 0x70 RAM+ ;
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: CELL! COLS /MOD AT-XY (emit) ;
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CODE BYE
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HL 0 LDdi,
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A 0x16 LDri, ( @EXIT )
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