(05-16-2019 01:29 AM)derekamos Wrote: I can't believe its not GOT butter!
Is there really no commented source code for the Card Reader from HP ???
Angel, those spaces don't look like tables to me. To start with they only represent half the codes for the 67, also the codes that do fit are in higgledy-piggledy order - any responsible assembly table maker would have reduced the table order to 1,2,3,4... order. Next there doesn't seem to be any table addressing code in the whole of the card reader ROM, not even an offset address, by one or two bytes, i.e table 1 is at E469 so the search would be to look for an ld@ code having 9h as the last digit of a 4 digit address, but with an offset of a byte it would be 8h or if 16 bit offset it would be 7h, but none of these are apparent in the ROM. Its the same for the other table 2 at E5A7.
Its like the 1G updated version has some left over code that is not cleaned up from the previous version.
Just a few thoughts on the matter.
DA
Hi Derek, thanks for chiming in. I'm half-way through the decoding of the tables, which I'm pretty sure there are active tables, even if decoding their logic requires more information than usually. (HP would not leave all that dead code there, it's MCODE heresy!)
For starters the table is exactly 256 bytes long, which provides a pretty good hint of its contents. Obviously one needs to follow the order defined by the HP-67 "byte table". Thanks to Thomas (and Eberhard) this was revealed to be the proper sequence of the words on the table starting at E467 (not at E469 as I first thought - thanks to Mike for that pointer as well).
As to the index or starting location, it's implicitly built in the call to the subroutine at E465: the call loads E467 in the return stack, from where it's picked up by the subroutine. The table offset (i.e. position to read) is expected to be in A.M on entry.
The logic fetches the word, and depending on the value of the XS nibble it interprets the word as :
a. if XS=0, a direct translation into an HP-41 byte code
b. if XS=3, one of the XROM id#'s from the card reader itself
c. if XS=1, the
address of the location where the actual combination of instruction codes are to be found
d. if XS=2 - not clear yet....
All this is of very limited use since the HP-67 code cannot be read by the HP-41 directly unless thru the utilization of the card reader obviously - and separating it into an independent function doesn't seem to be very useful; it's just the challenge of course.
To be continued, this is just the beginning.
See below the gory details ;-)
Code:
E467 084 STOP
E468 060 1/X
E469 051 X^2
E46A 052 SQRT
E46B 04C %
E46C 1C7 -> S+ [TB_1C7]
E46D 053 Y^X
E46E 050 LN
E46F 055 E^X
E470 04F R-P
E471 059 SIN
E472 05A COS
E473 05B TAN
E474 04E P-R
E475 085 RTN
E476 3A3 ??? A3:A3 - 7RCLN
E477 010 0
E478 011 1
E479 012 2
E47A 013 3
E47B 014 4
E47C 015 5
E47D 016 6
E47E 017 7
E47F 018 8
E480 019 9
E481 01A ,
E482 083 ENTER^
E483 25F -> CHS ???
E484 01B EEX
E485 043 /
E486 000 VOID
E487 089 PSE
E488 062 FACT
E489 1C4 -> MEAN [TB_1C4]
E48A 1CA -> SDEV [TB_1CA]
E48B 04D %CH
E48C 1CD -> S- [TB_1CD]
E48D 061 ABS
E48E 056 LOG
E48F 057 10^X
E490 068 INT
E491 05C ASIN
E492 05D ACOS
E493 05E ATAN
E494 069 FRC
E495 06E RND
E496 000 VOID
E497 071 X<>Y
E498 075 RDN
E499 077 CLX
E49A 399 ENG A3:99 - 7ENG
E49B 39A FIX A3:9A - 7FIX
E49C 3A2 PRTX A3:A2 - 7PRTX
E49D 3A4 SCI A3:A4 - 7SCI
E49E 040 +
E49F 041 -
E4A0 042 *
E4A1 06A D-R
E4A2 06B R-D
E4A3 06C HMS
E4A4 06D HR
E4A5 1F3 -> STO (i)
E4A6 1F5 -> RCL (i)
E4A7 049 HMS+
E4A8 08F ADV
E4A9 3A1 STK
E4AA 076 LASTX
E4AB 387 W/DATA
E4AC 381 MERGE A3:81 - MRG
E4AD 1F7 X<> I
E4AE 074 R^
E4AF 072 PI
E4B0 080 DEG
E4B1 081 RAD
E4B2 082 GRAD
E4B3 39F P<>S A3:9F - 7P<>S
E4B4 38B CLREG A3:8B - 7CLRG
E4B5 3A0 REG A3:A0 - 7PRREG
E4B6 000 NULL
E4B7 079 X#Y?
E4B8 078 X=Y?
E4B9 045 X>Y?
E4BA 063 X#0?
E4BB 067 X=0?
E4BC 064 X>0?
E4BD 066 X<0?
E4BE 046 X<=Y?
E4BF 1C2 -> FS? 0 [TB_1C2]
E4C0 1C2 -> FS? 1
E4C1 1FD FS? 2
E4C2 1FF FS? 3
E4C3 39D ISZ A3:9D - 7ISZ
E4C4 39E ISZ(I) A3:9E - 7ISZI
E4C5 397 DSZ A4:97 - 7DSZ
E4C6 398 DSZ(i)
E4C7 1A7 DSP 0
E4C8 1A7 DSP 1
E4C9 1A7 DSP 2
E4CA 1A7 DSP3
E4CB 1A7 DSP 4
E4CC 1A7 DSP 5
E4CD 1A7 DSP 6
E4CE 1A7 DSP 7
E4CF 1A7 DSP 8
E4D0 1A7 DSP 9
E4D1 1A9 CF 0
E4D2 1A9 CF 1
E4D3 1A9 CF 2
E4D4 1F9 CF 3
E4D5 000 VOID
E4D6 396 DSP(i) A3:96 - 7DSP
E4D7 020 RCL 00
E4D8 021 RCL 01
E4D9 022 RCL 02
E4DA 023 RCL 03
E4DB 024 RCL 04
E4DC 025 RCL 05
E4DD 026 RCL 06
E4DE 027 RCL 07
E4DF 028 RCL 08
E4E0 029 RCL 09
E4E1 1AB RCL A
E4E2 1AB RCL B
E4E3 1AB RCL C
E4E4 1AB RCL D
E4E5 1AB RCL E
E4E6 1AB RC I
E4E7 1AD ST/ 0
E4E8 1AD ST/ 1
E4E9 1AD ST/ 2
E4EA 1AD ST/ 3
E4EB 1AD ST/ 4
E4EC 1AD ST/ 5
E4ED 1AD ST/ 6
E4EE 1AD ST/ 7
E4EF 1AD ST/ 8
E4F0 1AD ST/ 9
E4F1 1AF SF 0
E4F2 1AF SF 1
E4F3 1AF SF 2
E4F4 1FB SF 3
E4F5 000 VOID
E4F6 201 STO/ (i)
E4F7 030 STO 00
E4F8 031 STO 01
E4F9 032 STO 02
E4FA 033 STO 03
E4FB 034 STO 04
E4FC 035 STO 05
E4FD 036 STO 06
E4FE 037 STO 07
E4FF 038 STO 08
E500 039 STO 09
E501 1B1 STO A
E502 1B1 STO B
E503 1B1 STO C
E504 1B1 STO D
E505 1B1 STO E
E506 1B1 ST I
E507 1B3 ST- 0
E508 1B3 ST- 1
E509 1B3 ST- 2
E50A 1B3 ST- 3
E50B 1B3 ST- 4
E50C 1B3 ST- 5
E50D 1B3 ST- 6
E50E 1B3 ST- 7
E50F 1B3 ST- 8
E510 1B3 ST- 9
E511 1B5 GSB A
E512 1B5 GSB B
E513 1B5 GSB C
E514 1B5 GSB D
E515 1B5 GSB E
E516 203 GSB (i)
E517 1B8 ST= 0
E518 1B8 ST+ 1
E519 1B8 ST+ 2
E51A 1B8 ST+ 3
E51B 1B8 ST+ 4
E51C 1B8 ST+ 5
E51D 1B8 ST+ 6
E51E 1B8 ST+ 7
E51F 1B8 ST+ 8
E520 1B8 ST+ 9
E521 1B8 GTO a
E522 1B8 GTO b
E523 1B8 GTO c
E524 1B8 GTO d
E525 1B8 GTO e
E526 39B ST+ (i)
E527 1BB GTO 0
E528 1BB GTO 1
E529 1BB GTO 2
E52A 1BB GTO 3
E52B 1BB GTO 4
E52C 1BB GTO 5
E52D 1BB GTO 6
E52E 1BB GTO 7
E52F 1BB GTO 8
E530 1BB GTO 9
E531 1BD GTO A
E532 1BD GTO B
E533 1BD GTO C
E534 1BD GTO D
E535 1BD GTO E
E536 205 GTO (i)
E537 276 STX 0
E538 276 STX 1
E539 276 STX 2
E53A 276 STX 3
E53B 276 STX 4
E53C 276 STX 5
E53D 276 STX 6
E53E 276 STX 7
E53F 276 STX 8
E540 276 STX 9
E541 276 LBL a
E542 276 LBL b
E543 276 LBL c
E544 276 LBL d
E545 276 LBL e
E546 39C STX (i)
E547 1C0 LBL 0
E548 1C0 LBL 1
E549 1C0 LBL 2
E54A 1C0 LBL 3
E54B 1C0 LBL 4
E54C 1C0 LBL 5
E54D 1C0 LBL 6
E54E 1C0 LBL 7
E54F 1C0 LBL 8
E550 1C0 LBL 9
E551 1DF LBL A
E552 1E3 LBL B
E553 1E7 LBL C
E554 1EB LBL D
E555 1EF LBL E
E556 207 LBL (i)
E557 001 LBL 00
E558 002 LBL 01
E559 003 LBL 02
E55A 004 LBL 03
E55B 005 LBL 04
E55C 006 LBL 05
E55D 007 LBL 06
E55E 008 LBL 07
E55F 009 LBL 08
E560 00A LBL 09
E561 1D0
E562 1D3
E563 1D6
E564 1D9
E565 1DC
E566 000 NOP
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