It's hard to imagine they could only leave less then 1% of the DRAM space for user programs to run (seems they can be stored in the 16MB Flash area) but without knowing something about the machine, I can't say if that's a problem or not. Thanks for the usual good detective work Jose, it's good to know the published values are indeed correct, even in misleading. It seems to be similar to the standard SH7724 (which is documented), according to someone that should know what it is talking about, since he successfully built several overclock tools for those Casio calculators. I found the official Cypress (SPANSION's owners) product notification information containg the equivalence table from the PANSION S99-50272 to theĬoncerning the processor, there is a consensus on the SH7305, despite CASIO not disclosing information about it. Therefore, a 16M 16-bit words (32MByte) storage is required to accommodate the firmware, additional apps, and leave the referred 16MByte of storage to the suer.Īnd I was lucky.
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The Firmware OS would take a substantial amount of storage, increased if additional applications are installed (the latest 3.11 update fx-CG50 Series OS Ver.3.11 Update.exe file takes 19.7MByte, so I expect the base firmware to take close to 16MByte). The Hitachi/Renesas custom made SH7305 processor for Casio fx-CG machines, uses a 16-bit data path. As correctly stated on Casiopeia Forum, this is a 32MByte chip.Īnd it makes sense to me, for two reasons:
Storage/ROM: SPANSION S99-50272 16M 16-bit words Flash ROMĪ lot of people comments that there is no information available on the SPANSION S99-50272 chip, and some of them comments that it is a 16MByte chip. RAM: ESMT M12L64164A-7TI 8MByte SDRAM (versus 2MByte SRAM on CG10/20) Meanwhile I found a few pictures of the internal PCB at TI-Planet and a lot of investigation going on there as well, and that allowed me to find out the exact memory configurations: So, the user would have around 61Kbyte of programming area, and a maximum of 16MByte of storage area on a fx-CG50. I now realize that those values are referred to the end user available usable spaces, not to the actual RAM/ROM configured sizes. Storage memory capacity: fx-CG50: 16MB (max.) fx-CG50: 4.5MB (max.) Programming capacity: 61,000 bytes (max.) Yet Casio keeps on supplying confusing information (May-2018) on the so called "fx-CG50 Hardware User's Guide": Then I forgot about it, until a recent CASIO announcement for the GRAPH 90+E equivalent model for French market.
My answer was given based on the CASIO officially available information, but I found it suspicious as well. This question from Bob is a very good one, and my reply contains misleading information. This MUST be typo!? Above was copy/pasted, to be sure I didn't introduce an error. "◦Available RAM/Flash ROM memory: 61 kB/16 MB" (01-31-2017 03:19 PM)jebem Wrote: (01-30-2017 08:58 PM)rprosperi Wrote: According to the Casio Europe website, this is the Specification for memory:
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