16 EXTRN bufferofs :WORD
\r
17 EXTRN displayofs :WORD
\r
19 EXTRN linewidth :WORD
\r
20 EXTRN blockstarts :WORD ;offsets from drawofs for each update block
\r
33 PROC VH_UpdateScreen
\r
34 PUBLIC VH_UpdateScreen
\r
38 mov ax,SC_MAPMASK+15*256
\r
51 mov bx,UPDATEWIDE*UPDATEHIGH-1 ; bx is the tile number
\r
55 ; see if the tile needs to be copied
\r
80 mov si,[blockstarts+bx]
\r