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1 ttl DEFs from VDGint
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2
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3 **********************
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4 * Defs from VDGint
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5 * all offsets from 'U' (address of device memory area)
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6 * (see p. 6-9, technical reference: U=start of driver data memory
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7 *
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8 * EDITION HISTORY:
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9
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10 * Date Changes Made
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11 * -------- ------------------------------
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12 * 91/05/07 Wrote original from VDGint source
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13
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14
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15 * NOTE: There is LOTS of stuff which is only used once, and some which
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16 * is not needed. Here's a list of the un-needed, and un-used (other than
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17 * once)
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18 *
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19 * It would probably be benificial to patch VDGint to fix these problems,
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20 * unless anyone else has ideas as to why VDGint is doing things this way.
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21 *
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22 * Un-needed
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23 * VD.EPlt1 - (2) set to VD.NChar, and then read only
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24 * VD.EPlt2 - (2) set to same as VD.EPlt1, and then unused
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25 * VD.Chr1 - (1) set to same as VD.CChar, and then unused
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26 * VD.PlFlg - (1) initialized to $08, and unused
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27 *
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28 * Un-used
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29 *
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30 * $1D - (1) end of SCF memory requirements
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31 * VD.Strt1 - (2) CLRed, and then read (LDD) - left as $0000
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32 * $24-$2B - (8)
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33 * $33-$34 - (2)
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34 * $7E-$FF - (130)
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35 *
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36 * total of 22 (150 in whole page) bytes unneeded or unused.
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37
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38 page
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39 VD.Start equ $1E start of VD.XXXX data: number of VDG screens in use
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40 VD.Strt1 equ $1F (2) and another start
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41 VD.Caps equ $21 caps lock info: $00=lower $FF=upper
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42 VD.DFlag equ $23 0=current screen is valid, $01-$FF = update video
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43 * $24-$2B unused
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44 VD.NGChr equ $2C number of additional characters to get
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45 VD.RTAdd equ $2D (2) return address after getting characters
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46 VD.EPlt1 equ $2F (2) pointer to where to put next character
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47 VD.EPlt2 equ $31 (2) as above.
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48 * $33-$34 unused
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49 VD.CFlag equ $35 true lowercase flag $10=true, $00=false
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50 VD.CFlg1 equ $36 VDG display code values
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51 VD.DGBuf equ $37 number of currently displayed buffer
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52 VD.ScrnA equ $38 (2) screen start address in system memory
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53 VD.ScrnE equ $3A (2) address of end of screen
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54 VD.CrsrA equ $3C (2) cursor address
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55 VD.CrsAL equ $3D cursor address low
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56 VD.CChar equ $3E value of character under cursor
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57 VD.Mode equ $3F mode: 0=256x192 x2, 1=128x192 x4
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58 VD.Chr1 equ $40 same as under cursor character
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59 VD.CColr equ $41 cursor color
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60 VD.Col equ $42 number of columns for this screen
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61 VD.Row equ $43 number of rows
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62 VD.TFlg1 equ $44 see WRITE ($0E)
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63 VD.Alpha equ $45 0 when in alpha mode
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64 VD.Rdy equ $46 device ready (see SS.DStat 0=not ready
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65 VD.SBAdd equ $47 (2) address of block screen is in
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66 VD.Blk equ $49 Block number of screen
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67 VD.GBuff equ $4A allocation for graphics buffers (block#)
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68 VD.AGBuf equ $4B (2) additional graphics buffer
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69 VD.HiRes equ $4D hi-res screen table (block value
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70 VD.NBlk equ $4E number of blocks in this screen
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71 VD.SType equ $4F screen type 0-4
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72 VD.HR2 equ $50 (3) for screen number 2
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73 VD.HR3 equ $53 (3) for screen 3 (same 3 bytes as above
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74 VD.FF3 equ $56 (2) data for flood fill
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75 VD.FF4 equ $58 (2) "
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76 VD.FF5 equ $5A (2) "
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77 VD.FF6 equ $5C flood fill flag
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78 VD.MTabl equ $5D (2) address of mask table for pixels in byte
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79 VD.PixBt equ $5F bit mask for modes (0=$07, 1=$03 )#pixels/byte
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80 VD.GCrsX equ $60 graphics cursor X value
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81 VD.GCrsY equ $61 graphics cursor Y
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82 VD.Msk1 equ $62 mask byte 1
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83 VD.Msk2 equ $63 mask byte 2 (00,55,AA,FF)
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84 VD.MCol equ $64 color? (C003,8001
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85 VD.MCol2 equ $65 color
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86 VD.PMask equ $66 pixel mask for colors (i.e. $55, $CC etc
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87 VD.FF1 equ $67 data for flood fill
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88 VD.FF2 equ $68 data for flood fill
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89 VD.FFMsk equ $69 flood fill mask
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90 VD.FFFlg equ $6A flood fill flag
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91 VD.Palet equ $6B (16) current palette values
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92 VD.PlFlg equ $7B initialized to $08 by L00DB, and then unused!
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93 VD.NChar equ $7C character to process
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94 VD.NChr2 equ $7D and the next one
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95
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96 * and RMB until we get 256 bytes reserved
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