For the calculator collector
Note: items here may have been sold or replaced. Please contact me directly if you have a specific request, this list and prices may or may not be accurate. Contact form is at the bottom of the page. Thank you. The prices here are inspired from the eBay sold items, I tried most of the […] The post Texas Instruments Items For Sale appeared first on vintagecalc .
The HP Museum site (HP-35 (hpmuseum.org)) mentions a first version prototype of the HP-35 with a whitish case and no front label (under the keys). It seems the same case was used for a HP-80 prototype which I own. The calculator works well and is a full fledged HP-80 as far as I can tell. […] The post Classic HP-80 Prototype appeared first on vintagecalc .
A very interesting and colorful version of the TI-1050 was made for the Czech company Koh-I-Noor and as far as I know it was sold exclusively by them. Datamath Calculator Museum mentions it but does not show an image; here it is. It is a full TI-1050, absolutely no difference. As it can be seen […] The post TI-1050 made for KOH-I-NOOR appeared first on vintagecalc .
The HP-94 is an industrial computer which was never released to the public. It was intended for companies which were supposed to develop custom software for it. Unfortunately it was too little too late probably because the calculator never actually reached the users. Few were sold to developers and therefore the machine is quite rare. […] The post HP-94 – A Computer For Custom Designs appeared…
I have acquired somehow a very interesting TI prototype. Unfortunately I do not really know the source but the Datamath museum has more information on it here: Texas Instruments Personal Learning Tool PLT SHH1. The “PLT” comes from “Personal Learning Tool”. The OS inside seems to be a version of Linux. The unit that is […] The post TI PLT-SHH1 Graphing Calculator Prototype appeared first on…
The very rare Tektronix 31 presented here is a very powerful calculator for its era but unlike the HP-9100 it never managed to acquire a significant share of the market. Perhaps that is why it is quite rare. The device presented here is a 220V device. Its power source has been refurbished (new capacitors) and […] The post Tektronix 31 Desktop Calculator appeared first on vintagecalc .
This machine is a large and heavy one! It is the same as a HP-9820, the difference being the tape instead of the magnetic card reader. It seems to be a very rare calculator. There is a fair amount of documentation on the 982x machines, if interested please contact me. This machine comes with three […] The post HP-9821A Desktop Calculator appeared first on vintagecalc .
Note: items here may have been sold or replaced. Please contact me directly if you have a specific request, this list and prices may or may not be accurate. Contact form is at the bottom of the page. Thank you. Please remember: I tried to price the slightly lower than what is now on eBay, […] The post Items for sale appeared first on vintagecalc .
A large number of third party software modules exists for the HP-41 family. This article will present some of them. The manufacturer is in all cases a third party and not HP. All modules presented here are functional and can be used in any HP-41 calculator. It is however possible that the modules might have […] The post HP-41C Custom Software Modules appeared first on vintagecalc .
The TI-1200/1250 family has a number of very common 4-function calculators but also a large number of custom made calculators for various customers who may have sold the machines under their own labels. TI-1225 The TI-1225 is such a machine, made (as the box says) for the True Value Hardware as can be seen here. […] The post TI-1200 Calculator Family – Less Common Versions appeared first on…