H89 disk transfer program - test-drb@ccmp.vtda.org

15 Apr 2003

Code Oops! see below:

...
 From: "Dwight K. Elvey"
&lt;dwightk.elvey(a)amd.com&gt;

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