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HP-42S =DOLAM Entry



#3

Well, after disassembling a significant part of HP-42S ROM (revision C) I must correct a little detail in J-F Garnier's article 'HP-42S: New Facts'. I haven't found =DOLAM entry at the address #02C6E as stated in the article. This address is inside =SKIPOB so it is impossible for =DOLAM to exist there. This is the code:

*********************************************************************
02C4B =SKIPOB
02C4B 841 ST=0 1
02C4E L_02C4E
02C4E 137 CD1EX
02C51 06 RSTK=C
02C53 D9 C=B A
02C55 06 RSTK=C
02C57 20 P= 0
02C59 D1 B=0 A
02C5B 871 ?ST=1 1
02C5E 80 GOYES L_02C66
02C60 L_02C60
02C60 142 A=DAT0 A
02C63 164 D0=D0+ 5
02C66 L_02C66
02C66 131 D1=A
02C69 143 A=DAT1 A
02C6C 34CF820 LC(5) =PRLG * =DOLAM should be inside this instruction !!!
02C73 8A6 ?A#C A
02C76 C0 GOYES L_02C82
02C78 1C4 D1=D1- 5
02C7B 133 AD1EX
02C7E 808C PC=(A)
02C82 L_02C82
02C82 3482D20 LC(5) L_02D28
02C89 8A6 ?A#C A
02C8C 70 GOYES L_02C93
02C8E CD B=B-1 A
02C90 421 GOC L_02CA3
02C93 L_02C93
02C93 8AD ?B#0 A
02C96 AC GOYES L_02C60
02C98 L_02C98
02C98 07 C=RSTK
02C9A D5 B=C A
02C9C 07 C=RSTK
02C9E 135 D1=C
02CA1 03 RTNCC
02CA3 L_02CA3
02CA3 184 D0=D0- 5
02CA6 51F GONC L_02C98
*********************************************************************

Furthermore, I haven't found this entry anywhere - maybe I am wrong but it seems that lambda support don't exist at all in the HP-42S. Just my 2 cents ...


#4

You may be right, Hrast. I may have been fooled by the PRLG word just at this address ...

Thanks.


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