OSWORD &51

DVR

OSWORD &51 (81) - Get maximum heap block size (DVR)

 On entry:
     XY=heap handle, points to heap block
 On exit:
     XY+0..1=size of the largest block available.
 If the call failed XY+0..1 is set to zero, C is also set.

CDFS

OSWORD &51 (81) - Write Real-Time clock (CDFS)

 On entry:
     XY?0 = seconds 0-59
     XY?1 = minutes 0-59
     XY?2 = hours 0-23
     XY?3 = day of week 1-7, 1=Sunday
     XY?4 = date of month 1-31
     XY?5 = month 1-12
     XY?6 = year 00-99

HKSET

OSWORD &51 (81) - HKSET Support (SEHK)

   On entry:
       XY?0   = command
       XY+1.. = any parameters
   On exit:
       XY?0   = result:
                &00=ok
                &FF=signal fault
                &FE=no acknowledge from hardware
                &FD=no printer
       XY+1.. = any additional returned data

Commands

1 - read the news line

   On entry:
       XY?0   =&01
       XY+1..2=address to read up to 80 characters + cr
   On exit:
       XY?0=result: 0=ok, &FF=signal fault, &FE=no ack from hardware

2 - read a chinese character definition

   On entry:
       XY?0   =&02
       XY!1   =address in I/O processor to read 32 bytes
       XY?5   =&80 for absolute ROM address, &00 for character number
       XY?6   =byte 0
       XY?7   =byte 1
   On exit:
       XY?0=result: &00=ok
                    &FF=no character ROM found
                    &F0=character ROM 0 not found
                    &0F=character ROM 1 not found
                    &E0=number in byte 0 and byte 1 out of range

3 - get bytes from a page in remote memory

   On entry:
       XY?0   =&03
       XY!1   =data address in I/O processor
       XY?5   =&00 for teletext page, &80 for stock page
       XY?6   =Handle
       XY?7   =Start Row (0-24)
       XY?8   =Start Column (0-79 for stock page, 0-39 for teletext page)
       XY!9   =Number of bytes to read
                        0-&7CF for stock page, 0-&3E7 for teletext page
   On exit:
       XY?0=result: 0=ok, &FF=signal fault, &FE=no ack from hardware

4 - test remote hardware

   On entry:
       XY?0   =&04
   On exit:
       XY?0=result: 0=ok, otherwise a bitmap of the chapters with errors
                    in, b0=error in chapter 1, b7=error in chapter 8.

5 - print stock page to screen or printer

   On entry:
       XY?0   =&05
       XY?1    = &80=screen only, &C0=screen and printer
       XY?2    = Handle
   On exit:
       XY?0=result: 0=ok, &FF=signal fault, &FE=no ack from hardware
                    &FD=no printer

6 - get new stock/teletext page (slow)

   On entry:
       XY?0   =&06
       XY?1   =&00 for teletext page, &80 for stock page
               For a teletext page:
                XY?2    = Magazine      (0-&7)
                XY?3    = Page Tens     (0-&F)
                XY?4    = Page Units    (0-&F)
                XY?5    = Hours Tens    (0-&3)  Here and below is
                XY?6    = Hours Units   (0-&F)  the Time Extension
                XY?7    = Minutes Tens  (0-&7)  Usually fill
                XY?8    = Minutes Units (0-&F)  with zeros
               For a stock page:
                XY?2    = LS Byte Stock Code (BCD)
                XY?3    = MS Byte Stock Code (BCD)
                          eg to get stock 16 XY?2=&16, XY?3=0
                          Stock pages are numbered 0 to 399
   On exit:
       XY?0=result: &FF=signal fault, &FE=no ack from hardware
                    otherwise, handle to refer to the page
                    in future calls. 0=no more handles.

7 - get new stock/teletext page (fast)

   On entry:
       XY?0   =&07
       XY?1   =&00 for teletext page, &80 for stock page
               For a teletext page:
                XY?2    = Magazine      (0-&7)
                XY?3    = Page Tens     (0-&F)
                XY?4    = Page Units    (0-&F)
                XY?5    = Hours Tens    (0-&3)  Here and below is
                XY?6    = Hours Units   (0-&F)  the Time Extension
                XY?7    = Minutes Tens  (0-&7)  Usually fill
                XY?8    = Minutes Units (0-&F)  with zeros
               For a stock page:
                XY?2    = LS Byte Stock Code (BCD)
                XY?3    = MS Byte Stock Code (BCD)
                          eg to get stock 16 XY?2=&16, XY?3=0
                          Stock pages are numbered 0 to 399
   On exit:
       XY?0=result: &FF=signal fault, &FE=no ack from hardware
                    otherwise, handle to refer to the page
                    in future calls. 0=no more handles.

8 - enter HKSET in I/O processor

   On entry:
       XY?0   =&08
   On exit:
       No exit, as lanhuage is entered. This is an incorrect way of entering
       a language, and this call should not be used. A language should always
       be entered via OSCLI or OSBYTE 142.

See Also

• http://mdfs.net/Docs/Comp/BBC/Oswords