From: Bo Zimmerman (bo_at_zimmers.net)
Date: 2002-10-09 16:59:03
Well, Marko, I'm glad you are enjoying your new toys-- those are indeed amusing bugs. Regarding the SP9000, have you replaced the PS already, or are you using a simple transformer? There's an electronics shop here in town that sells 300W (and higher) 110<->220 step-up/step-down transformers for about $25.00. I use them with all the Euro-machines that I have not replaced the PS in. I can give you (or anyone else here interested) their contact information if you need it. - Bo > -----Original Message----- > From: firstname.lastname@example.org > [mailto:email@example.com]On Behalf Of Marko Mäkelä > Sent: Wednesday, October 09, 2002 3:37 AM > To: firstname.lastname@example.org > Subject: Bugs in Commodore calculators > > > Yesterday I finally tested my 110-volt Commodores with a 50 watt > 220->110 volt transformer: the US*1, the 207, the 202 and the SP9000. > > The 207 is a stripped-down version of the 202. It doesn't have a brake > lever for stopping the motor after an operation is completed, and it has > two digits less precision than the 202 and a smaller and less > powerful motor. > It was equipped with a black ribbon, and I didn't try it with a black&red > ribbon, but I think it should be able to print negative numbers > in red, just > like the 202 does. I found three bugs in these calculators: > > - there is no overflow check (well, I didn't expect that) > - the "× REPT" key does not add up negative numbers > - the CLR or CLEAR key for cancelling an entry prints a "-" sign at the > right margin if the running total is negative (normally it does not > print anything) > > The US*1 has a more amusing bug. Once it is powered up, typing K ÷ (the > key labelled "K" and the key labelled with the division operator) will > start an infinite calculation that is constantly updated on the screen. > Sometimes, this loop cannot be broken with the C key: the calculator has > to be switched off. You can also type a number before typing K ÷. Then > the display will show parts of the number together with the sequence. > I guess that it's somehow trying to divide by zero. This calculator > lacks overflow and underflow checks as well. If I remember correctly, > the only IC inside this calculator has not been made by Commodore or MOS. > So, the calculator might be from the early 1970s. The display has orange > digits and no lenses like some later LED-based models. > > I didn't play much with the SuperPET, as it was overloading and > overheating > the transformer. According to a power meter, it consumed over 70 watts, > which is well over the 50 watt rating of the transformer. The US*1 > consumes about four watts (or five when displaying all 8's), and the 202 > (which has a slightly more powerful motor than the 207) took 51 watts when > the REPT key was being pressed down and the motor was running constantly. > > Marko > > Message was sent through the cbm-hackers mailing list Message was sent through the cbm-hackers mailing list
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