Description
HP 48GX in box, nearly "as new", with sealed case and manuals
HP 48GX in box, nearly "as new", with sealed case and manuals
Hewlett-Packard 48GX Scientific Graphing Calculator- CPU clock frequency: 3.7 to 4 MHz
- Some claim that the frequency varies according to temperature [1]
- According to one of the engineers on the design team of the HP48G series (Dave Arnett), the yields for 4MHz CPUs were essentially separated into two parts: the ones closest to spec, generally near 3.93-3.94MHz, were reserved for the expandable models (GX), and those just slightly under spec were used for the non-expandable units (G). Eventually the yields improved and the CPUs which clocked closer to 4MHz were installed in the non-expandable units as well. The effects of (non-extreme) temperatures are almost negligible.[citation needed]
- Memory clock frequency: 2 MHz
- CPU codename: Yorke
- Communication Protocol(s): Serial Transfers: Kermit (protocol) or Xmodem; Infrared Transfers: proprietary
- On-board ROM: 512 kB
- On-board RAM: 128 kB (G+/GX)
- Maximum additional memory for expansion card port 1: 128 kB
- Maximum additional memory for expansion card port 2: 4 MB (128 kB addressable at any given time via bank switching)
- Other communication protocols: XModem
- ROM versions: K, L, M, P, R