Operator`s manual

Downloadable Graphic Images Chapter 6

466 Operators Manual58

The 466 font structure consists of commands, a header, a look-up table, a character

descriptor, and character data. All words are in Intel format: low byte, high byte. The graphic

image structure is the same as the font structure.

Sample Graphic

Figure 14

Note: All multi-byte hexadecimal fields are written least-significant-byte first.

Font/Graphic File Format and Sample Data

File

Data

Size Name Notes

^An ^D106 freeform, <CR> terminated Download Cmd n = user font number (1-255)

ASCII-HEXED

Data

Size Name Notes

00 1 byte Orientation 00h = upright, 01h = 90 deg.

B2000000 4 bytes File Length length of remaining data in bytes

1E00 2 bytes Max Cell Height >= height of image (or tallest character in font)

00 1 byte Default Spacing

20 1 byte First Printable Char

20 1 byte Last Printable Char

20 1 byte Default Char Char to use if not a printable char.

04000000 4 bytes Char Offset Distance in bytes from beginning of this field to

beginning of corresponding character

structure (Char Height). (Repeat field as

needed for each character in font. Only one

character is used in a graphic file.)

1E00 2 bytes Char Height Height of char image in dots (corresponds to

number of bytes in character generator table

for this char.)

2800 2 bytes Char Width Width of char image in dots

0000 2 bytes Top Offset Distance in dots between top of char image

and Max Cell Height

0000 2 bytes Bottom Offset Distance in dots between bottom of char and

bottom of cell.

0000 2 bytes Right Offset, Non Signed right offset for non-proportional fonts

0000 2 bytes Left Offset, Non Signed left offset for non-proportional fonts

0000 2 bytes Right Offset, Prop Signed right offset for proportional fonts

0000 2 bytes Left Offset, Prop Signed left offset for proportional fonts

0500 2 bytes Byte Width Width of char image data in bytes ((Char

Width + 7) / 8)

6060606060 5 bytes Bottom row of image

F0F0F0F0F0 5 bytes Middle row of image