Character Generator ROM data

[Allison]

>
>Subject: Character Generator ROM data
>   From: Chuck Swiger <cswiger at widomaker.com>
>   Date: Fri, 21 Oct 2005 21:47:44 -0400
>     To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org>
>
>Gang -
>
>    Anybody know of readily available data for, say, 7x9 dot-matrix characters?
>I'm looking for a downloadable rom image for something like in old video 
>cards to
>paint ascii characters on a display.
>
>For example, my Polymorphic Systems Video Terminal Interface (VTI) card uses
>an  MCM6571A (or it could use a 6574)   -BUT-   I do not need exactly that
>font - any 7x9 data will work.    Spent the past hour trying terms in 
>google w/o
>anything usable turning up.

Is simple.  Find a pattern you like in row or colum scan and convert the 
bit pattern to a string of hex values and cook an Eprom/EEPROM.

Myself I needed a while back a 7x9 that had decenders one of the M6571 
series has that so I found that data sheet.  They fit easily into a 2716
or similar.  

Hint where they go in rom is based on SxC IE: number of scan lines typically 
11 or 12 for 7x9 fonts and the number of characters.  For 7x9 CRT fonts 
(ROW scanned) the low 4 addresses lines are the row data and the next 7 
(128 char font) are the character address.  Nothing magic.


Allison