Hi,
Thanks for the extra details which helps us (to help you). The more information you give, the better chance of us being able to suggest the most satisfactory solution.
First, the AXE110P is a moderately complex board; the schematic diagram is shown in the datasheet (from the "buy now" page), but there doesn't seem to be a full program listing. We can create a new program for your present project, but an existing functional program would be very helpful. Do you have the RTC add-on ?
If the logger is only required to record "room temperatures", then we can take some short cuts. It's probably not necessary to record to 1/16 degree; 1/8 or even 1/4 may be sufficient. Therefore you may be able to fit the data into a single byte, which will make the coding much easier. Thus you could record 0 - 31.9 degrees with 1/8 degree resolution (i.e. almost every "decimal" fraction, e.g. 0 , 1 , 3 , 4 , 5 , 6 , 8 , 9) or say -16 to +48 degrees with 1/4 degree resolution (e.g. .0 , .2 , .5 , .7).
Also, you could interpret the data "in context": if for example, the recorded data goes 3.x , 2.x , 1.x , 0.x degrees, then if the next value is 31.5 , it's very probable that the value is actually -0.5 ! And, if you're only recording values every half hour, then you can almost certainly use the (easier) EEPROM, rather than those (obsolete) banks of RAM in the 18X.
If you only have a Mac then you might be able to use MacAXEPad, rather than switching to Windows (every time). It doesn't have a simulator and I believe there have been "issues" with Apple mandating their 64-bit OS. But if we're suggesting some program code, then we can try to ensure it's compatible with AXEPad (i.e. avoiding the "new" features of PE6).
Yes, the Manuals can be overwhelming, so look at a few program examples, in association with the PICAXE > BASIC Commands > link at the top of this forum page. Sometimes the "Finished Projects > Code Snippets" section can help and sometimes a Google search including "PICAXE" in the search list can be more productive than a direct forum search.
Keep us updated with your current plans/problems and we'll try to assist more.
Cheers, Alan.