Added simple File/load example
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Andrew Alderwick
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( simple Dev/File reading example )
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( devices )
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|00 @System [ &vector $2 &pad $6 &r $2 &g $2 &b $2 ]
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|20 @Screen [ &vector $2 &width $2 &height $2 &pad $2 &x $2 &y $2 &addr $2 &color $1 ]
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|a0 @File [ &vector $2 &success $2 &offset $2 &pad $2 &name $2 &length $2 &load $2 &save $2 ]
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( variables )
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|0000
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( program )
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|0100 @reset ( -> )
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( load contents from file )
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#1000 .File/length DEO2
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;filename .File/name DEO2
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;contents .File/load DEO2
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.File/success DEI2 ORA ,&success JCN
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( failed to read: bright yellow background )
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#f0f7 .System/r DEO2
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#f0f7 .System/g DEO2
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#00f7 .System/b DEO2
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BRK
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&success
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( read successful: dark blue background, show contents )
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#00f7 .System/r DEO2
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#00f7 .System/g DEO2
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#40f7 .System/b DEO2
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;contents DUP2 .File/success DEI2 ADD2 SWP2 ;draw JSR2
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BRK
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@draw ( end-ptr* ptr* -- )
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EQU2k ,&end JCN
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LDAk
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DUP #0a EQU ,&linefeed JCN
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#00 #0005 SFT2 ;font ADD2
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.Screen/addr DEO2
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#29 .Screen/color DEO
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.Screen/x DEI2 #0008 ADD2 .Screen/x DEO2
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&next
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#0001 ADD2
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,draw JMP
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&linefeed
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POP
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#0000 .Screen/x DEO2
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.Screen/y DEI2 #0008 ADD2 .Screen/y DEO2
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,&next JMP
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&end
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POP2 POP2
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JMP2r
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@get-x-advance ( font-char-addr* -- advance* )
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( Save two 00 bytes for later use )
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#0000 SWP2
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( First, load the eight bytes that make up the character )
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LDA2k SWP2 #0002 ADD2
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LDA2k SWP2 #0002 ADD2
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LDA2k SWP2 #0002 ADD2
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LDA2
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( OR all the bytes together, so we know which columns contain filled pixels )
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ORA2 ORA2 ORA2 ORA
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( Find the lowest set bit (using one of the 00 bytes at the top, but not consuming it) )
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SUBk AND
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( Convert the nine possible values (00-80) into an offset into the magic table (00-08). )
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( They get jumbled up with these two operations, but each possible value remains unique )
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#a3 MUL #16 DIV
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( Load the byte from the magic table, return a short (consuming/returning the 00 bytes at the top) )
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;&magic ADD2 LDA
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JMP2r
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( The magic table performs the last bit of arithmetic we want:
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* the advance in x should be one more than the number of columns with filled pixels,
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* with a maximum of 8, and
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* a minimum of 3. )
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&magic
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03 ( lowest set bit is 00, 0 columns wide )
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06 ( lowest set bit is 08, 5 columns wide )
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05 ( lowest set bit is 10, 4 columns wide )
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08 ( lowest set bit is 02, 7 columns wide )
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04 ( lowest set bit is 20, 3 columns wide )
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03 ( lowest set bit is 80, 1 column wide )
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07 ( lowest set bit is 04, 6 columns wide )
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08 ( lowest set bit is 01, 8 columns wide )
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03 ( lowest set bit is 40, 2 columns wide )
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@font ( spectrum-zx font )
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[
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0000 0000 0000 0000 0000 2400 7e3c 0000 0000 2400 3c42 0000 0000 6c7c 7c38 1000
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0010 387c 7c38 1000 0038 387c 6c10 3800 0010 387c 7c10 3800 0000 0018 1800 0000
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007e 4242 4242 7e00 0000 1824 2418 0000 0018 2442 4224 1800 001e 063a 4a48 3000
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0038 446c 107c 1000 000c 0808 0838 3800 003e 2222 2266 6600 0000 0822 0022 0800
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0000 1018 1c18 1000 0000 0818 3818 0800 0008 1c00 001c 0800 0028 2828 2800 2800
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003e 4a4a 3a0a 0a00 000c 3046 620c 3000 0000 0000 0000 ffff 0010 3800 3810 0038
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0008 1c2a 0808 0800 0008 0808 2a1c 0800 0000 0804 7e04 0800 0000 1020 7e20 1000
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0000 4040 7e00 0000 0000 0024 6624 0000 0000 1038 7c00 0000 0000 007c 3810 0000
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0000 0000 0000 0000 0008 0808 0800 0800 0014 1400 0000 0000 0024 7e24 247e 2400
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0008 1e28 1c0a 3c08 0042 0408 1020 4200 0030 4832 4c44 3a00 0008 1000 0000 0000
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0004 0808 0808 0400 0010 0808 0808 1000 0000 1408 3e08 1400 0000 0808 3e08 0800
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0000 0000 0008 0810 0000 0000 3c00 0000 0000 0000 0000 0800 0000 0204 0810 2000
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003c 464a 5262 3c00 0018 2808 0808 3e00 003c 4202 3c40 7e00 003c 421c 0242 3c00
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0008 1828 487e 0800 007e 407c 0242 3c00 003c 407c 4242 3c00 007e 0204 0810 1000
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003c 423c 4242 3c00 003c 4242 3e02 3c00 0000 0008 0000 0800 0000 0800 0008 0810
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0000 0810 2010 0800 0000 003e 003e 0000 0000 1008 0408 1000 003c 4202 0c00 0800
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003c 425a 5442 3c00 0018 2442 7e42 4200 007c 427c 4242 7c00 003c 4240 4042 3c00
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0078 4442 4244 7800 007e 407c 4040 7e00 003e 4040 7c40 4000 003c 4240 4e42 3c00
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0042 427e 4242 4200 003e 0808 0808 3e00 0002 0202 4242 3c00 0044 4870 4844 4200
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0040 4040 4040 7e00 0042 665a 4242 4200 0042 6252 4a46 4200 003c 4242 4242 3c00
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007c 4242 7c40 4000 003c 4242 524a 3c00 007c 4242 7c44 4200 003c 403c 0242 3c00
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00fe 1010 1010 1000 0042 4242 4242 3c00 0042 4242 4224 1800 0042 4242 5a66 4200
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0042 2418 1824 4200 0082 4428 1010 1000 007e 0408 1020 7e00 000c 0808 0808 0c00
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0040 2010 0804 0200 0018 0808 0808 1800 0008 1422 0000 0000 0000 0000 0000 7e00
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0008 0400 0000 0000 0000 1c02 1e22 1e00 0020 203c 2222 3c00 0000 1e20 2020 1e00
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0002 021e 2222 1e00 0000 1c22 3c20 1e00 000c 101c 1010 1000 0000 1c22 221e 021c
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0020 202c 3222 2200 0008 0018 0808 0400 0008 0008 0808 4830 0020 2428 3028 2400
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0010 1010 1010 0c00 0000 6854 5454 5400 0000 5864 4444 4400 0000 3844 4444 3800
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0000 7844 4478 4040 0000 3c44 443c 0406 0000 2c30 2020 2000 0000 3840 3804 7800
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0010 103c 1010 0c00 0000 4444 4444 3800 0000 4444 2828 1000 0000 4454 5454 2800
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0000 4428 1028 4400 0000 4444 443c 0438 0000 7c08 1020 7c00 000c 0810 1008 0c00
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0008 0808 0808 0800 0030 1008 0810 3000 0000 0032 4c00 0000 3c42 99a1 a199 423c
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]
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@filename "hello.txt 00
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@contents
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