20c38e5cd0
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!
139 lines
3.4 KiB
Forth
139 lines
3.4 KiB
Forth
( ----- 600 )
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TRS-80 Recipe
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Support code for the TRS-80 recipe. Contains drivers for the
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keyboard, video and floppy. At the moment, they are thin layer
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over the drivers provided by TRSDOS' SVC.
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Load with "602 LOAD".
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There is also the RECV program at B612.
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( ----- 602 )
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1 8 LOADR+
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( ----- 603 )
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CODE (key)
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A 0x01 LDri, ( @KEY )
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0x28 RST,
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PUSHA,
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;CODE
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CODE (emit) EXX, ( protect BC )
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BC POP, ( c == @DSP arg ) chkPS,
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A 0x02 LDri, ( @DSP )
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0x28 RST,
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EXX, ( unprotect BC ) ;CODE
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CODE AT-XY EXX, ( protect BC )
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DE POP, H E LDrr, ( Y )
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DE POP, L E LDrr, ( X ) chkPS,
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A 0x0f LDri, ( @VDCTL ) B 3 LDri, ( setcur )
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0x28 RST,
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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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0x28 RST,
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CODE @DCSTAT ( drv -- f ) EXX, ( protect BC )
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BC POP,
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chkPS,
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A 0x28 LDri, ( @DCSTAT )
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0x28 RST,
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PUSHZ,
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EXX, ( unprotect BC ) ;CODE
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( ----- 605 )
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CODE @RDSEC ( drv cylsec addr -- f ) EXX, ( protect BC )
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HL POP,
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DE POP,
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BC POP,
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chkPS,
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A 0x31 LDri, ( @RDSEC )
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0x28 RST,
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PUSHZ,
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EXX, ( unprotect BC ) ;CODE
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( ----- 606 )
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CODE @WRSEC ( drv cylsec addr -- f ) EXX, ( protect BC )
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HL POP,
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DE POP,
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BC POP,
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chkPS,
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A 0x35 LDri, ( @WRSEC )
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0x28 RST,
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PUSHZ,
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EXX, ( unprotect BC ) ;CODE
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CODE @GET ( a -- c f )
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DE POP,
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chkPS,
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A 0x03 LDri, ( @GET )
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0x28 RST,
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PUSHA, PUSHZ,
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;CODE
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( ----- 607 )
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CODE @PUT ( c a -- f ) EXX, ( protect BC )
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DE POP,
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BC POP,
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chkPS,
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A 0x04 LDri, ( @PUT )
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0x28 RST,
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PUSHZ,
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EXX, ( unprotect BC ) ;CODE
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( ----- 609 )
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: _err LIT" FDerr" ERR ;
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: _cylsec ( sec -- cs, return sector/cylinder for given secid )
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( 4 256b sectors per block, 10 sec per cyl, 40 cyl max )
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10 /MOD ( sec cyl )
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DUP 39 > IF _err THEN
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8 LSHIFT + ( cylsec )
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;
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: FD@! ( wref blk -- )
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1 @DCSTAT NOT IF _err THEN
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2 LSHIFT ( 4 * -- wr sec )
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4 0 DO ( wr sec )
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DUP I + _cylsec ( wr sec cs )
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I 8 LSHIFT BLK( + ( wr sec cs addr )
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1 ROT ROT ( wr sec drv cs addr )
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4 PICK EXECUTE NOT IF _err THEN
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LOOP 2DROP ;
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( ----- 610 )
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: FD@ ['] @RDSEC SWAP FD@! ;
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: FD! ['] @WRSEC SWAP FD@! ;
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: FD$ ['] FD@ BLK@* ! ['] FD! BLK!* ! ;
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: _err LIT" *CLerr" ERR ;
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: *CL< 0 BEGIN DROP 0x0238 @GET UNTIL ;
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: *CL> 0x0238 @PUT NOT IF _err THEN ;
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( ----- 612 )
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( We process the 0x20 exception by pre-putting a mask in the
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(HL) we're going to write to. If it wasn't a 0x20, we put a
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0xff mask. If it was a 0x20, we put a 0x7f mask. )
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: @GET,
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A 0x03 LDri, ( @GET )
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DE COM_DRV_ADDR LDdi,
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0x28 RST, JRNZ, L2 FWR ( maybeerror )
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A ORr,
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CZ RETc, ( Sending a straight NULL ends the comm. ) ;
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: @PUT, ( @PUT that char back )
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C A LDrr,
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A 0x04 LDri, ( @PUT )
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0x28 RST, JRNZ, L3 FWR ( error )
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A C LDrr, ;
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H@ ORG !
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HL DEST_ADDR LDdi, ( cont. )
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( ----- 613 )
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BEGIN,
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A 0xff LDri, (HL) A LDrr, ( default mask )
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L1 BSET ( loop2 ) @GET, @PUT,
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0x20 CPi, JRZ, L4 FWR ( escapechar )
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( not an escape char, just apply the mask and write )
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(HL) ANDr, (HL) A LDrr,
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HL INCd,
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JR, AGAIN,
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L4 FSET ( escapechar, adjust by setting (hl) to 0x7f )
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7 (HL) RES, JR, L1 BWR ( loop2 )
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L2 FSET ( maybeerror, was it an error? )
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A ORr, JRZ, L1 BWR ( loop2, not an error )
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L3 FSET ( error )
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C A LDrr, ( error code from @GET/@PUT )
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A 0x1a LDri, ( @ERROR ) 0x28 RST, RET,
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