Re: Inverse and Flash don't work :(

[mjmahon@aol.com (Michael J. Mahon)]

Marco wrote:

>Recentely I've powered my old Apple][+ , since many year. It work, I can ran
>all my games and my apps and even simple applesoft-basic programs.
>But there are some problems:
>The cursor it not showed, and inverse and flash mode don't wore: even I type
>inverse and flash, I see carachter in normal mode and cursor is invisible.
>Can anyone help me ?

This sounds like a pre-Revision 7 main board.

There are two ICs common to both inverse and flashing character generation,
the 74LS02 OR-gate at B13 and the 74S86 XOR-gate at B2.  If I had to choose,
I'd try replacing the 74S86 first.

If it were only flashing that didn't work, then the 74LS08 (B11) or the 555(B3)
would be the likely suspects.

>Thanks in advice and forgive me for my english

Your english is fine!

Good luck,

-michael

Check out parallel computing for 8-bit Apples on my
Home page:  http://members.aol.com/MJMahon/