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annotate fib.s68 @ 478:2e4a4188cfb0

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Fix DMA fill so that it does not cause observable changes to the FIFO. Get DMA copy mostly correct from an observable ffect perspective. DMA copy probably does not reflect internal implementation still given that evidence seems to suggest no FIFO usage at all.
author Mike Pavone <pavone@retrodev.com>
date Tue, 17 Sep 2013 00:11:45 -0700
parents f664eeb55cb4
children 2455662378ed f7fe240a7da6
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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19
4717146a7606 Initial support for M68k reset vector, rather than starting at an arbitrary address
Mike Pavone <pavone@retrodev.com>
parents: 1
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1 dc.l $0, start
4717146a7606 Initial support for M68k reset vector, rather than starting at an arbitrary address
Mike Pavone <pavone@retrodev.com>
parents: 1
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2 start:
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f664eeb55cb4 Mostly broken VDP core and savestate viewer
Mike Pavone <pavone@retrodev.com>
parents: 19
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3 moveq #36, d0
0
2432d177e1ac Initial work on M68K instruction decoding
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parents:
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4 bsr fib
2432d177e1ac Initial work on M68K instruction decoding
Mike Pavone <pavone@retrodev.com>
parents:
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5 illegal
2432d177e1ac Initial work on M68K instruction decoding
Mike Pavone <pavone@retrodev.com>
parents:
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6 fib:
1
5a2c1da6dd0f Make sure all operations are long-word length on fib example.
Mike Pavone <pavone@retrodev.com>
parents: 0
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7 cmp.l #2, d0
0
2432d177e1ac Initial work on M68K instruction decoding
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parents:
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8 blt base
1
5a2c1da6dd0f Make sure all operations are long-word length on fib example.
Mike Pavone <pavone@retrodev.com>
parents: 0
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9 subq.l #1, d0
0
2432d177e1ac Initial work on M68K instruction decoding
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10 move.l d0, -(a7)
2432d177e1ac Initial work on M68K instruction decoding
Mike Pavone <pavone@retrodev.com>
parents:
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11 bsr fib
2432d177e1ac Initial work on M68K instruction decoding
Mike Pavone <pavone@retrodev.com>
parents:
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12 move.l (a7), d1
2432d177e1ac Initial work on M68K instruction decoding
Mike Pavone <pavone@retrodev.com>
parents:
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13 exg d0, d1
2432d177e1ac Initial work on M68K instruction decoding
Mike Pavone <pavone@retrodev.com>
parents:
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14 move.l d1, (a7)
1
5a2c1da6dd0f Make sure all operations are long-word length on fib example.
Mike Pavone <pavone@retrodev.com>
parents: 0
diff changeset
15 subq.l #1, d0
0
2432d177e1ac Initial work on M68K instruction decoding
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parents:
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16 bsr fib
2432d177e1ac Initial work on M68K instruction decoding
Mike Pavone <pavone@retrodev.com>
parents:
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17 move.l (a7)+, d1
2432d177e1ac Initial work on M68K instruction decoding
Mike Pavone <pavone@retrodev.com>
parents:
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18 add.l d1, d0
2432d177e1ac Initial work on M68K instruction decoding
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parents:
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19 rts
2432d177e1ac Initial work on M68K instruction decoding
Mike Pavone <pavone@retrodev.com>
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20 base:
2432d177e1ac Initial work on M68K instruction decoding
Mike Pavone <pavone@retrodev.com>
parents:
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21 moveq #1, d0
2432d177e1ac Initial work on M68K instruction decoding
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parents:
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22 rts