Ah, NMI is part of the WatchDog RESET for the 9010. If the Keyboard
Strobe isn't clearing U31 every few ms, then U31 RESETs the peripherals,
and sends NMI (0066h) to the CPU.
Fluke 9010A Memory locations for various functions.
ROM 0000-BFFF
RAM C000-FFFF
(1)0000h I/O-0 00 Read Fuse Blown & Event counter (Read)
(1)0020h I/O-1 Reset Sig generator and event counter (write any
data)
(1)0040h I/O-2 Reads Low byte of the Probe Signature (Read)
(1)0060h I/O-3 Reads High byte of the Probe Signature (Read)
(1)0080h-(1)0081h I/O-4 Keyboard/Watchdog Clear (W/R)
(1)00A0h-(1)00A1h I/O-5 Mag Tape
(1)00C0h-(1)00C3h I/O-6 Pod/Probe I/O
(1)00E0h-(1)00E1h I/O-7 RS-232
Update to loop below...
John :-#)#
At 12:41 AM 22/05/2002 -0700, TechToolsList@flippers.com wrote:
Another tidbit, the 'Waiting for
Key Press' loop also checks if the Probe FUSE is blown. But it doesn't
seem to trip the NMI (0066h) while still strobing the keyboard I/O. Need
to dig further...
John :-#)#
At 11:39 PM 21/05/2002 -0700, John Robertson wrote:
Well, I was working on the code for
the 9010 and came up with an idea, why not log what happens with a single
read. So now I'm getting info on the memory locations. for example it
turns out that the display uses memory locations: F577h to F596h (32
characters):
Fluke 9010A Memory locations for various
functions.
ROM
U21 Display
Ram
DATA
85A4h F577h 1st position for display R (52)
85A5h F578h 2nd position
display E (45)
85A6h F579h
3rd
A (41)
85A7h F57Ah
4th
D (44)
85A8h F57Bh
5th
(space - 20)
85A9h F57Ch
6th
@ (40)
85AAh F57Dh
7th
(space - 20)
The data byte (location of read) is now read from U21 starting at
8623h
in reverse order.
I'll get more out as I figure it out...it seems that locations F345h and
F346h are the Signature data locations...(thanks David F)
FF95h - Position pointer for display (incremented by 1 for every
character added above)
-------------------------------------------------------------------------
This is the wait cycle of the 9010 when nothing is happening:
STATE
PC DISASSEMBLY BUS ACTIVITY
(start or at least what I call the start - it's an endless loop...)
00489 76D0 JR
Z,7707-$
00491 7707 LD
C,00
00493 7709 JP
BE84
00496 BE84 LD
IX,SP
00498 BE86 POP IX
FF53>60 FF54>FF
00502 BE88 POP HL
FF55>B0 FF56>73
00505 BE89 POP AF
FF57>52 FF58>73
00508 BE8A JP
(HL)
00509 73B0 LD
A,C
00510 73B1 OR
A
00511 73B2 JR
NZ,73E5-$
00513 73B4 JR
73AA-$
00515 73AA LD L,(IX+04)
FF64>52
00519 73AD CALL 767C FF58<73
FF57<B0
00524 767C RST 20H
FF56<76 FF55<7D
00527 0020 JP
BE77
00530 BE77 POP DE
FF55>7D FF56>76
00533 BE78 EX (SP),HL FF57>B0 FF58>73
FF58<73 FF57<52
00538 BE79 PUSH HL
FF56<73 FF55<B0
00541 BE7A PUSH IX
FF54<FF FF53<60
00545 BE7C LD
IX,0000
00549 BE80 ADD
IX,SP
00551 BE82 EX
DE,HL
00552 BE83 JP
(HL)
00553 767D LD
HL,FFC7
00556 7680 ADD
HL,SP
00557 7681 LD
SP,HL
00562 7685 CP
7F
00564 7687 JR
Z,768E-$
00566 768E LD
L,00
00568 7690 CALL BA5C FF19<76
FF18<93
00573 BA5C LD
C,L
00574
BA5D IN C,(C)
00>80 (Has the Fuse Blown - 08h if fuse
open)
00577
BA5F LD
B,00
00579 BA61
RET
FF18>93 FF19>76
00582 7693 LD
A,C
00583 7694 AND
80
00585 7696 LD
C,A
00586 7697 JR
NZ,76C9-$
00588 76C9 LD
L,81
00590 76CB CALL BA5C FF19<76
FF18<CE
00595 BA5C LD
C,L
00596
BA5D IN C,(C)
81>08 (Keyboard Entry Flag)
00599
BA5F LD
B,00
00601 BA61
RET
FF18>CE FF19>76
00604 76CE BIT 00,C
(repeat from the top - 00489)
Well, I'm getting tired...not a Z80 guru by a long shot.
John :-#)#