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https://github.com/hsoft/collapseos.git
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80d1b59050
Splitting a word into MSB/LSB pairs happens often and is worth, I think, native words. Also, I'm going to need it in the upcoming commits.
77 lines
1.7 KiB
Forth
77 lines
1.7 KiB
Forth
0xbf00 CONSTANT RS_ADDR
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0xbffa CONSTANT PS_ADDR
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RS_ADDR 0x80 - CONSTANT SYSVARS
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0x8000 CONSTANT HERESTART
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SYSVARS 0x70 + CONSTANT LCD_MEM
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SYSVARS 0x72 + CONSTANT GRID_MEM
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SYSVARS 0x75 + CONSTANT KBD_MEM
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0x01 CONSTANT KBD_PORT
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5 LOAD ( z80 assembler )
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262 LOAD ( xcomp )
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522 LOAD ( font compiler )
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282 LOAD ( boot.z80.decl )
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270 LOAD ( xcomp overrides )
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( TI-84+ requires specific code at specific offsets which
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come in conflict with Collapse OS' stable ABI. We thus
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offset the binary by 0x100, which is our minimum possible
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increment and fill the TI stuff with the code below. )
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0x5a JP, 0x15 ALLOT0 ( 0x18 )
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0x5a JP, ( reboot ) 0x1d ALLOT0 ( 0x38 )
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( handleInterrupt )
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DI,
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AF PUSH,
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( did we push the ON button? )
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0x04 ( PORT_INT_TRIG ) INAi,
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0 ( INT_TRIG_ON ) A BIT,
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IFNZ,
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( yes? acknowledge and boot )
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0x03 ( PORT_INT_MASK ) INAi,
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0x00 ( INT_MASK_ON ) A RES, ( ack interrupt )
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0x03 ( PORT_INT_MASK ) OUTiA,
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AF POPqq,
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EI,
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0x100 JP,
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THEN,
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AF POP,
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EI,
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RETI,
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0x03 ALLOT0 ( 0x53 )
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0x5a JP, ( 0x56 ) 0xff A, 0xa5 A, 0xff A, ( 0x5a )
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( boot )
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DI,
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IM1,
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( enable the ON key interrupt )
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0x03 ( PORT_INT_MASK ) INAi,
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0x00 ( INT_MASK_ON ) A SET,
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0x03 ( PORT_INT_MASK ) OUTiA,
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A 0x80 LDri,
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0x07 ( PORT_BANKB ) OUTiA,
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EI,
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( LCD off )
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A 0x02 ( LCD_CMD_DISABLE ) LDri,
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0x10 ( LCD_PORT_CMD ) OUTiA,
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HALT,
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0x95 ALLOT0 ( 0x100 )
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( All set, carry on! )
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CURRENT @ XCURRENT !
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0x100 BIN( !
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283 335 LOADR ( boot.z80 )
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353 LOAD ( xcomp core low )
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CREATE ~FNT CPFNT3x5
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605 609 LOADR ( LCD low )
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402 403 LOADR ( Grid )
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616 620 LOADR ( KBD low )
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390 LOAD ( xcomp core high )
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(entry) _
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( Update LATEST )
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PC ORG @ 8 + !
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," LCD$ KBD$ GRID$ " EOT,
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ORG @ 0x100 - |M 2 PC! 2 PC!
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H@ |M 2 PC! 2 PC!
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