MSX Village forum

BLTVD
Address  : #019D
Function : Copy Diskfile to VRAM
Input    : SX -Address  of filenaam.
           SX, SY, ARG, L_OP. NX and NY must be in diskfile
Registers: All
 

The filename should be set first to use the disk (specify the filename as 
BASIC). The following is an example:
 
.
.
.
LDHL,FNAME; Get pointer to file name
LD(FNPTR),HL; Set it to parameter area
.
.
.
FNAME:DB 22H,"B:TEST.PIC",22H,0       ; "TEST.PIC", end mark
 
When an error occurs, control jumps to the error handler of the BASIC 
interpreter. Set the hook to handle the error in the user program or to call 
this routine from MSX-DOS or a ROM cartridge. This hook is H.ERRO (FFB1H).
 
 
* BLTVD (019DH/SUB)
 
  Function:transfers from disk to VRAM
 
  Input:HL register <-- F562H
The following parameters should be set:
 
* FNPTR (F562H, 2)address of the filename
* DUMMY (F564H, 2)dummy (not required to be set)
* DX (F566H, 2) X-coordinate of the destination
* DY (F568H, 2) Y-coordinate of the destination
* NX (F56AH, 2) number of dots in the X direction
(not required to be set; this is
already in the top of data to be
transferred)
* NY (F56CH, 2) number of dots in the Y direction
(not required to be set; this is
already in the top of data to be
transferred)
* CDUMMY (F56EH, 1)dummy (not required to be set)
* ARG (F56FH, 1)selects the direction and expansion
RAM (same as VDP R#45)
* LOGOP (F570H, 1)logical operation code (same as the
logical operation code of VDP)
 
  Output:the CY flag is set when there is an error in the parameter
 
  Registers:all