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LORES1 map 128 normal lores (32 foreign + 96 ascii) 128 bold lores (same order as normal) 128 tiny lores (same order as normal) 64 symbol lores (10 lores are still free) HIRES1 map 96 characters for OZ window (ascii, icons...) |
In order to spare the 32K RAM of the original z88, the RES0 size vary if the machine is expanded or not.
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SBF structure Row 1 : 108 chars ($7800-$78D7) + Window 1 properties ($78D8-$78E6) + 25 bytes free ($78E7-$78FF) Row 2 : 108 chars ($7900-$79D7) + Window 2 properties ($79D8-$79E6) + 25 bytes free ($79E7-$79FF) Row 3 : 108 chars ($7A00-$7AD7) + Window 23 properties ($7AD8-$7AE6) + 25 bytes free ($7AE7-$7AFF) Row 4 : 108 chars ($7B00-$7BD7) + Window 24 properties ($7BD8-$7BE6) + 25 bytes free ($7BE7-$7BFF) Row 5 : 108 chars ($7C00-$7CD7) + Window 25 properties ($7CD8-$7CE6) + 25 bytes free ($7CE7-$7CFF) Row 6 : 108 chars ($7D00-$7DD7) + Window 26 properties ($7DD8-$7DE6) + 25 bytes free ($7DE7-$7DFF) Row 7 : 108 chars ($7E00-$7ED7) + Window 27 properties ($7ED8-$7EE6) + 25 bytes free ($7EE7-$7EFF) Row 8 : 108 chars ($7F00-$7FD7) + Window 28 properties ($7FD8-$7FE6) + Main screen data ($7FE7-$79FF) Main screen data are : $7FE7 2 bytes : Active window frame $7FE9 1 byte : SOH sequence length (0 if none) $7FEC x bytes : SOH buffer Example with a sequence defining a user lores character : 1,138,'=',..,... $7FE9 10 the length $7FEC '=' the command $7FED user defined character number $7FEE user defined character data (8 raws) |
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Window properties frame structure IX-01 Y up left IX-02 X up left IY-03 Y down right IY-04 X down right IY-05 Left margin IY-06 Right margin IY-07 Y cursor address IY-08 X cursor address IY-09 cursor attributes IY-10 always 0 IY-11 flags low IY-12 open flags IY-13 flags hi b0-b1 Justification (0 normal, 1 right, 2 left, 3 centered) b6 Set to update cursor b7 Cursor mode (set=ON) IY-14 flags 2 (1 initialization bit used) |
Uses of the Screen Registers
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Screen file address are read by OS_Sci with A=file reason and B=0, result is in BHL. The Lores0 and Hires0 can be moved by the user (often used in the Ranger software). For more details about the Screen registers consult Blink registers manipulations chapter.
Full Graphic Screen
It is possible to have a full graphic array of 640x64. It requires only HIRES0. A total of 640 HIRES0 characters are needed. The SBF is filled with all of those HIRES0 characters (80 characters by row). Accessing the screen matrix is done by changing the HIRES0 settings directly in the RAM.