HP-35/45 Simulator for PDP-8

On Thu, 8 Sep 2016, Vincent Slyngstad wrote: Yes, I think, there is a bug in your code: SNL CLA /CLA IS REDUNDANT, AS AC is 0 here CLL CMA /CLL MAKES NO SENSE BECAUSE LINK IS NOT SET, IF THE SNL /DOES NOT SKIP CLL /IS NEEDED AFTER THE SNL, OTHERWAYS THE MSB WOULD BE /INVERTED AFTER THE BSW-ROUTINE. I tried both versions with the emulator, and both gave identical results. So I tested another "BSW"-replacement, simply: BSWEMU, 0000 RTR RTR RTR JMP I BSWEMU This also worked. ;-) I didn't look in the code, but evidently the BSWs are only used, to get the higher 6 bits of a word. And now another question came up. What does a hp-calculator answer, if you ask fot tan(90)? Answer: hp35_emu: 90 t gives 9.9999999999 E99 hp35_real: didn't find the power supply :-( hp9100: 90 tan gives 9.9999999999 E99 hp9810: 90 tan gives 9.9999999999 E98 (yes, E98!) hp9820: 90 tan gives "NOTE 01" Here are the three version of BSW: / K. KRAUSE K. OWEN V. SLYNGSTEDT BSWEMU, NOP /BSWSUB, 0 /BSW, 0 DCA AC / DCA BSWTMP / DCA SAVEAC RAL / SZL / SNL DCA LINK / TAD C0100 / CMA TAD AC / DCA BSWLINK / CLL RTR / TAD BSWTMP / DCA SAVEL RTR / CLL / TAD SAVEAC RTR / AND C7700 / AND C7700 AND M0077 / RAL / TAD SAVEAC DCA BH / TAD BSWLNK / RTL TAD AC / DCA BSWLNK / RTL AND M0077 / TAD BSWTMP / RTL RTL / AND C0077 / ISZ SAVEL RTL / TAD BSWLNK / CML RTL / RTL / JMP I BSW TAD BH / RTL /SAVEAC,0 CLL RAL / RTL /SAVEL, 0 TAD LINK / JMP I BSWSUB /C7700, 7700 RAR / BSWTMP JMP I BSWEMU / BSWLNK AC, 0000 / C7700 LINK, 0000 / C0077 BH, 0000 / C0100 M0077, 0077 / I added literals an temporary locations to the code, because one cannot be sure, that a special literal, as for example 0100 or 0077 exists in the other code. Klemens -- klemens krause Stuttgarter KompetenzZentrum fyr Minimal- & Retrocomputing. http://computermuseum.informatik.uni-stuttgart.de