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annotate sf2_vram_map.txt @ 1503:a763523dadf4 segacd

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Added code for initializing a combined Genesis + Sega CD system when a Sega CD ISO is loaded
author Michael Pavone <pavone@retrodev.com>
date Wed, 13 Dec 2017 09:44:41 -0800
parents b231162c8fdd
children
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b231162c8fdd Add some logic analyzer captures, a Python script for analyzing said captures and a higher level analysis of the output
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1 0000: single color blocks
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2 0200: Random symbols????
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3 0400-0C00: Font
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4 0C00-0E??: Score font
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5 0E??: Player name displays
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7 2000-3000: floor (mostly, some garbage around 2800 and 2A00)
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8 3000-6C00: background
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9 6C00-8000: not graphics
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10 8000-~8A00: bat/bird sprites, special attack text
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11 8A00-9000: ?????
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12 9000-9200: More special attack text
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13 9200-9600: another font
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14 9800-AA00: special attack effects?
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15 AC00-B000: ????
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16 B000-B500: character sprite
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17 ????
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18 C000-C500: chracter sprite
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19 D000-DA00: window name table
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20 DA00-DC00: Sprite attribute table
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21 DC00-E000: horizontal scroll data
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22 E000-????: plane A&B name table
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23 C500-FFFF: not graphics
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25 VDP Registers:
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26 Mode
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27 00 - 14
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28 01 - 64
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29 Scroll A Name Table Address: E000
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30 02 - 38
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31 Window Name Table Address: D000
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32 03 - 34
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33 Scroll B Name Table Address: E000
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34 04 - 07
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35 Sprite Attribute Table Address: DA00
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36 05 - 6D
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37 06 - 00
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38 Backdrop color - 0
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39 07 - 00
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40 08 - 00
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41 09 - 00
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42 HINT Counter
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43 0A - AF
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44 Mode - Full screen vertical scroll, line horizontal scroll, external ints disabled, 32 cell display, no interlacing
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45 0B - 03
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46 0C - 00
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47 H Scroll Data Address: DC00
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48 0D - 37
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49 0E - 00
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50 Auto increment
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51 0F - 02
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52 Scroll Size
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53 10 - 11
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54 Window H Pos
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55 11 - 00
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56 Window V Pos
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57 12 - 05
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58 DMA transfer length
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59 13 - 00
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60 14 - 00
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61 DMA source address and mode
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62 15 - DB
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63 16 - CF
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64 17 - 7F