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From: prestonb@hpcvra.CV.HP.COM (Preston Brown)
Newsgroups: comp.sys.handhelds
Subject: Re: How compatible is the HP-28S with the HP-48SX?
Message-ID: <25590049@hpcvra.CV.HP.COM>
Date: 22 Aug 90 16:37:53 GMT
References: <69@iconsys>
Organization: Hewlett-Packard Co., Corvallis, OR, USA
Lines: 29


>Does the FAST program that set the clock speed on the 28S work
>for the 48SX?

No, the 48SX is already running at the "fast" speed and the speed 
cannot be changed.

>Of course, I'd use the recently posted POKE program for the 48SX, rather than
>BAG, but is #FFF00h the correct offset to poke the #Fh, or am I stuck in slow
>mode?  

The memory map for the 48 is considerably different, the control registers
now start at #00100h.  There is no longer a speed control register.

>The 28S is quite a bit faster than the 48SX when the clock speed has
>been increased like this.

The 28 may be slightly faster doing display operations when the 28 is
in fast mode but other operations should be about the same.

>Is it possible to somehow transfer my stuff on the 28S to the 48SX via the
>infrared IO port?  Perhaps I could send my programs on the 28S to the infrared
>port like I was printing to the printer, and read and translate the data on
>the 48SX end back into normal program format?

I posted a program to do just that a few months ago.  You will need a cable
to download the program since it is binary and cannot be typed in.

Preston