Another week has passed without anybody standing up and stating reasons for the HP-35 way of sorting the basic arithmetic operators. Looks like this way is DAAD (dead as a doornail). Thus, we'll stay with + − × / below ENTER.Walter wrote: ↑Fri Nov 27, 2020 11:19 pmA week has passed and just one person has supported Peet's story (newspeak:Walter wrote: ↑Thu Nov 19, 2020 10:39 pmThanks. May be. At least this is an ansatz. But one operation has to go bottom left, and according to your story HP chose divide.Peet wrote: ↑Thu Nov 19, 2020 9:54 pmThere are many users who have operated the classic RPN calculator with two thumbs. With this type of operation and with the one-finger version for right-handers, the lower left button is ergonomically less accessible than the + button on the "classics" Position.

If this really was the reason, why on earth did they also swap plus and minus? They could have put simply / × − + (bottom up) in the left column, couldn't they? Are there any grey-haired troupers supporting Peet's story?narrative). This doesn't sound good for a rational base of / × − + (bottom up) or even / × + − in the left column of pocket calculator keys. Anyone else?

## 43S News

### Re: 43S News

DM42 SN: 00041 β

HP-35, HP-45, ..., HP-35S, WP 34S, WP 31S, DM16L

**WP 43S running**on this deviceHP-35, HP-45, ..., HP-35S, WP 34S, WP 31S, DM16L

### Re: 43S News

Looks like we can expect a lot more program memory than I thought so far. Program steps vary in length so exact numbers are impossible to calculate. But present data indicate that some 20 000 steps in RAM are possible, with up to 10 000 steps in one program. Program specific step counting (like in HP-42S) is supported:

.

.

DM42 SN: 00041 β

HP-35, HP-45, ..., HP-35S, WP 34S, WP 31S, DM16L

**WP 43S running**on this deviceHP-35, HP-45, ..., HP-35S, WP 34S, WP 31S, DM16L

### Re: 43S News

(There seems to be a limit of 3 files per post so I've to continue with a new post:)

See some local registers and flags in action, also using indirect addressing:

.

See some local registers and flags in action, also using indirect addressing:

.

DM42 SN: 00041 β

HP-35, HP-45, ..., HP-35S, WP 34S, WP 31S, DM16L

**WP 43S running**on this deviceHP-35, HP-45, ..., HP-35S, WP 34S, WP 31S, DM16L

### Re: 43S News

For you who want to play and test over the holidays, there is a new wp43s.exe available in https://gitlab.com/Over_score/wp43s/-/t ... 20binaries

Enjoy!

Enjoy!

DM42 SN: 00041 β

HP-35, HP-45, ..., HP-35S, WP 34S, WP 31S, DM16L

**WP 43S running**on this deviceHP-35, HP-45, ..., HP-35S, WP 34S, WP 31S, DM16L

### Re: 43S News

The Christmas update of the

Merry Christmas!

**WP43S Owner's Manual**is available at a gitlab close to you.Merry Christmas!

DM42 SN: 00041 β

HP-35, HP-45, ..., HP-35S, WP 34S, WP 31S, DM16L

**WP 43S running**on this deviceHP-35, HP-45, ..., HP-35S, WP 34S, WP 31S, DM16L

### Re: 43S News

Meanwhile, program step specific byte counting was dropped:

. .

(actually not the counting but the display of bytes per step).

. .

(actually not the counting but the display of bytes per step).

DM42 SN: 00041 β

HP-35, HP-45, ..., HP-35S, WP 34S, WP 31S, DM16L

**WP 43S running**on this deviceHP-35, HP-45, ..., HP-35S, WP 34S, WP 31S, DM16L

### Re: 43S News

Two days ago, in a forum in the wild wild west, Valentin Albillo set the following task:

But is this really the maximum volume? Let's try with 1 dimension less: 742x3 = 2226 which are 205 too much. Thus, 537 edges must be 3, and 205 must be 2, and the volume is 3^537x2^205. This is the previous volume times 9/8.

So I continued reducing dimensions in larger steps until reaching 674 parts. 674x3 = 2022 which is only 1 too much. Thus, 673 edges must be 3, and 1 must be 2, and the volume is 3^673x2. Keying this in the WP43S simulator, you get a long integer with 321 digits. The exact value is

Just a little demonstration what can be done...

The maximum product must be the volume of a hypercube in n-dimensional space, as far as possible under the conditions set. Luckily I had got my WP43S handy and tried a bit. Result: maximum volume is achieved for (2021/743)^743. The 743 edges of the hypercube must be either 2 or 3 long. 743x3 = 2229 which are 208 too much. Thus, 535 edges must be 3, and 208 must be 2, and the volume is 3^535x2^208.Let's partition 2021 into a set of positive integer numbers that add up to 2021. Find the set of such numbers whose product is maximum, and output that maximum in all its full glory.

For instance, we could have 2021 = 1 + 1 + ... + 1 (2021 1's) and their product would be 1 x 1 x ... x 1 = 1, which doesn't quite cut it. We could also have 2021 = 137 + 682 + 1202 and their product would be 137 x 682 x 1202 = 112307668, which is much better but still far from the maximum as well.

But is this really the maximum volume? Let's try with 1 dimension less: 742x3 = 2226 which are 205 too much. Thus, 537 edges must be 3, and 205 must be 2, and the volume is 3^537x2^205. This is the previous volume times 9/8.

So I continued reducing dimensions in larger steps until reaching 674 parts. 674x3 = 2022 which is only 1 too much. Thus, 673 edges must be 3, and 1 must be 2, and the volume is 3^673x2. Keying this in the WP43S simulator, you get a long integer with 321 digits. The exact value is

**2532995521886826292328149655127793939711079648569980904926813070890600257967555788084132383052323458136675408253781974882864255212314264505911807500659338824573345556963262198232747186628808383273213581619626233679533487706060253494981896112664520885716630483899029142003916544644957076791520721759240671604739781810307846**Just a little demonstration what can be done...

DM42 SN: 00041 β

HP-35, HP-45, ..., HP-35S, WP 34S, WP 31S, DM16L

**WP 43S running**on this deviceHP-35, HP-45, ..., HP-35S, WP 34S, WP 31S, DM16L

### Re: 43S News

Finally, acceptance of long integer arithmetic

Pauli

Pauli

### Re: 43S News

743-dimensional space is quite out of touch compared to linear regression, for instance. Pure and applied math... the cream and the cake... IMHO.

DM42 SN: 00041 β

HP-35, HP-45, ..., HP-35S, WP 34S, WP 31S, DM16L

**WP 43S running**on this deviceHP-35, HP-45, ..., HP-35S, WP 34S, WP 31S, DM16L

### Re: 43S News

Aaand now, I'm just waiting for the '43s to calculate the cube root of Grahams Number

Esben

DM42 SN: 00245

DM42 SN: 00245