H89 disk transfer program

From: Dwight K. Elvey <dwightk.elvey_at_amd.com>
Date: Tue Apr 15 16:22:01 2003

Code Oops! see below:

>From: "Dwight K. Elvey" <dwightk.elvey_at_amd.com>
>
>Hi
> Here is the code I have so far. I've shortened it a
---snip---
>
> BOOTSTRP.ASM
>
>; 42 BYTE BOOTSTRAP LOADER WITH INIT FOR 8250
>; INTENDED FOR THE H89 BUT MAY ASLO WORK ON H8.
>
>
> ORG 2300H
>LDR: XRA A
> OUT LCNTL ; LINE CONTROL
> OUT IER ; NO INTERRUPTS
> OUT MCNTL ; INIT MODEM CONTROL
> DCR A ; SHOULD BE 'MVI A, 80H' BUT 0FFH OK?
> OUT LCNTL
> MVI A, 0CH ; 9600 BAUD
> OUT DVL
> XRA A
> OUT DVH
> MVI A, 07H ; 8 BIT 2 STOPS
> OUT LCNTL
> IN LSTAT
> IN RX ; CLEAR ANY JUNK
> LXI H, 2400H ; DEPENDS ON SIZE (TO BE DETERMINED)
>LDR1: IN LSTAT
> ANI 01
> JZ LDR1 ; WAIT FOR CHAR
> IN RX
> MOV M,A
> DCX H
> JMP LDR ; ADDRESS TO BE OVER WRITTEN BY CODE LOADED
>
should be:
        JMP LDR1 ; ADDRESS TO BE OVER WRITTEN BY CODE LOADED


Later
Dwight
Received on Tue Apr 15 2003 - 16:22:01 BST