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   (read keyboard ? page 4-32 of the Service Manual)     
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    (    
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 :-#)#

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