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https://github.com/hsoft/collapseos.git
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e6bac985fa
Finally got rid of the XPACKed core and managed to cross-compile all core words, which greatly simplifies the bootstrapping process.
74 lines
1.7 KiB
Forth
74 lines
1.7 KiB
Forth
0x8000 CONSTANT RAMSTART
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0xb000 CONSTANT RS_ADDR
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0xbffa CONSTANT PS_ADDR
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RAMSTART 0x70 + CONSTANT LCD_MEM
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RAMSTART 0x72 + CONSTANT KBD_MEM
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0x01 CONSTANT KBD_PORT
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212 LOAD ( z80 assembler )
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: ZFILL, ( u ) 0 DO 0 A, LOOP ;
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262 LOAD ( xcomp )
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522 LOAD ( font compiler )
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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 JPnn, 0x15 ZFILL, ( 0x18 )
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0x5a JPnn, ( reboot ) 0x1d ZFILL, ( 0x38 )
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( handleInterrupt )
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DI,
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AF PUSHqq,
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( did we push the ON button? )
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0x04 ( PORT_INT_TRIG ) INAn,
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0 ( INT_TRIG_ON ) A BITbr,
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IFNZ,
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( yes? acknowledge and boot )
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0x03 ( PORT_INT_MASK ) INAn,
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0x00 ( INT_MASK_ON ) A RESbr, ( ack interrupt )
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0x03 ( PORT_INT_MASK ) OUTnA,
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AF POPqq,
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EI,
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0x100 JPnn,
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THEN,
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AF POPqq,
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EI,
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RETI,
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0x03 ZFILL, ( 0x53 )
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0x5a JPnn, ( 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 ) INAn,
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0x00 ( INT_MASK_ON ) A SETbr,
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0x03 ( PORT_INT_MASK ) OUTnA,
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A 0x80 LDrn,
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0x07 ( PORT_BANKB ) OUTnA,
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EI,
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( LCD off )
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A 0x02 ( LCD_CMD_DISABLE ) LDrn,
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0x10 ( LCD_PORT_CMD ) OUTnA,
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HALT,
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0x95 ZFILL, ( 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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282 LOAD ( boot.z80 )
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393 LOAD ( xcomp core low )
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CREATE ~FNT CPFNT3x5
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555 560 LOADR ( LCD low )
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566 570 LOADR ( KBD low )
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420 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$ (ok) RDLN$ ; _ "
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ORG @ 0x100 - 256 /MOD 2 PC! 2 PC!
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H@ 256 /MOD 2 PC! 2 PC!
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