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img0048.txt
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img0048.txt
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‘iL % €OSABS:°EOS TF HEWLETT -PACKA™ : LOPrece iS83 Conf identia! Sat. Be na 624 OUR
LOCATION OBJECT CODE LINE SOURCE LINE
1670 ;
1671 CALLED BY PUT_VRAM_ AND GET VRAM_
1672
1673 ' SETS BYTE COUNT AND INDEX FOR WRITES TO AND READS FROM VRAM.
1674
1675 ; TABLE BYTES/ITEM
1676 ; SPRITE NAME 4
1677 ; SPRITE GEN 8
1678 ; PATTERN NAME 1
1679 ; PATTERN GEN #
1680 ; COLOR (MODE 1) 1
1681 ; COLOR (MODE 2) a
1682 ;
EOODS 1683 SET COUNT
EOOS FDES 1684 PUSH lY -Save count on stack
E007 4F 1685 LD C,A ;Get table code 4
EODS FEO4 1686 cp 4 >See if color table
EODA 2008 1687 JR NZ.NOT COLOR TBL_ACCESS -If not then check for name table
1688 :;Color Table
EODC 3AFDG61 1689 LO A, (VOP_MODE WORD] ;Get mode word to check graphics type
EOODF E602 1690 AND 02H ;Bit 1 indicates mode i or 2
EOE1 2814 1691 JR Z,ADD_TO_ BASE ;If mode 1 then start index is not modif ted
EOE3 79 1692 LD A.C ;Get table code back
1693 ;Fall through to multiply by 8 for mode 2.
EOE4 1694 NOT COLOR TBL_ACCESS
EOE4 FEO2 1695 cP 2 ;Check for Name table
EOE6 280F 1696 JR Z,ADD TO BASE ;If so then don’t modify start index
1697 ;At this point the table code is:
1698 Sprite attribute table, Sprite gen table,
1699 ; Pattern gen table, or Color table in Mode 2
1700
EOES EB 1701 EX DE .HL -Get count in HL
EOES 29 1702 ADD HL ,HL 3*2
1703
EOEA 29 1704 ADO HL.HL +4
EOEB 87 1705 OR A ;Check for Sprite attr table
EOEC 2801 1706 JR Z,HAVE_CNT ;If so then Index*4 is complete
EOEE 29 1707 ADD HL, HL ;If not then Index*8 is required
1708 ; this is for the pattern gen table,
1709 ; sprite gen table, or color gen table
1710 ; in mode 2.
EOEF 1711 HAVE CNT:
EOEF ES 1712 EX DE ,HL ;Put updated index in DE
EOFO E3 1713 EX {SP),HL ;Get count off stack
1714 :-Put address of RAM buffer on stack
1715
1716 ;Now modify the count for:
1717 ; Sprite attribute table, Sprite gen table,
1718 Pattern gen table, or Color table in Mode 2
EOF1 29 1719 ADD HL.HL
EOF2 29 1720 ADD HL.HL
EOF3 2801 1721 UR Z,HAVE_CNT2 ;If Sprite attr table then +4 {is enoungh
1722 ; (the zero flag is still set from earlier)
EOFS 29 1723 ADD Ht,HL ;Count *8 for remaining tables
EOF6 1724 HAVE CNT2:
EOF6 E3 1725 EX {SP} ,HL ;Save updated count on stack
1726 ‘Restore RAM buffer off stack