Dwayne Reid wrote:

> Hi again, Tony.
>
> Couple of thoughts and observations:
>
> 1) I just noticed this - shouldn't you org BOOT.asm somewhere past 0x04 to
> avoid interrupt issues?  May not be an issue for the app you are working on
> but might be for others.

I changed the boot code like this

        org 0h
        goto start

        org 4h
        goto 0x0081

start   ; boot code starts here




In your source code with no interrupts

        org 0x0080

        ; your code begins


In your source code with interrupts

        org 0x0080

        goto start
        goto Interrupt  ; or just put interrupt code here
                        ; causes extra 2 machine cycles each IRQ
                        ; for 1 extra goto instruction

start   ; your code begins


> 2) I just had a look at the new schemo - ground missing at jumction of C8
> and CN1 pin 5.

Fixed

> question - do all versions of the MAX232 contain that 400K pullup?

Don't know off hand.

> This is a hell of an idea you had, Tony, something probably as important as
> David Tait's simple programmer.  Thanks for sharing.

No problem.

ROMzap has just been upladed again.

--
Best regards

Tony

http://www.picnpoke.com
mailto:sales@picnpoke.com