cloos@batcomputer.tn.cornell.edu (James H. Cloos Jr.) (04/27/88)
Hello, I bought a 28C back in December. Although it is a very powerful calculator, I soon decided that there was simply too little RAM in it. Now the 28S is available, & I will eventually buy one, but just when I'll be able to get the cash together is a big question. So, could someone (perhaps from HP) email me some specs on the differences between the two. Some specific questions I have concern amount of RAM/ROM, new commands if any, expanded units if any, expandability (cf 41CX & family), compatability with my printer (purchased mid January), does the S incorporate any of the commands found in the 18C, are any newer models in this family of calculators/printers scheduled for availablilty any time in 1988, are there any at all (That you can tell me about) on the drawing boards). PLease make comparisons between the C & S where appropriate if you answer any of the specific concerns I outlined above. Thank you for any and all help in this matter. (P.S. If anyone's curious, the greater the improvement, and the less the likelyhood of a better HP coming out REAL soon, the sooner I upgrade.) P.P.S. While I'm at it, is there any upgrade policy other than `buy the newer model & good luck selling the older one' for these calculators? -JimC -- batcomputer!cloos@cornell.UUCP \ James H. Cloos, Jr. cloos@batcomputer.tn.cornell.EDU \ Pick & This Space cloos@tcgould.tn.cornell.EDU / Choose All Disclaimers For Rent cloos@crnlthry.BITNET / Naturally Apply
Jake-S@cup.portal.com (05/04/88)
Here's a repeat of an earlier posting (which was recently removed due to old age): A first list of 28C - 28S differences 1. CPU speeded up from 600KHz to 1 MHZ (53%) 2. Menu key markings surrounded by white rectangles, red key markings are darker red. 3. RAM expanded from 1.6K usable to almost 32K usable. 4. Some menu keys moved from right to left keyboard, others around on same side. 5. User subdirectories possible in RAM, with accompanying functions CRDIR (create directory), HOME (move to top), PATH (return path to current sub- directory), VARS (return string of user var's in CURRENT directory) and CLUSR (clear vars only in current directlry) 6. SOLVER menu shows variables in inverse video 7. ALPHA LOCK function replaced on left keyboard by the MENUS function, which locks the left keyboard in the shifted position for one-key access to any
Jake-S@cup.portal.com (05/04/88)
(continuation of the differences list):
right-hand keyboard menu
8. Binary numbers displayed with 'b', 'd', 'h' and 'o' in the display, and can
now be entered in any specified base.
9. The MENU function allows programmable displaying of any menu by numbered
input.
10.Modes are indicated by a small square after the current choice, rather than
inverse video, like the 28C.
11.Printing of screen dumps may now be done by pressing ON and L (PRINT) keys
together.
12.Screens may be saved to string objects (and returned to the display) via
the LCD-> and ->LCD commands under program control, and by hitting the DEL
key while a display to be saved is up.
13.CATALOG and UNITS scans by holding the key down, rather than pressing the
SCAN key.
14.Errors are better described better in the display.
15.Custom menus may be generated in two types: "INPUT" and "USER" type.
16.Some UNITS have been updated and some have been added.
17.VISITing programs lists them indented to show structure.
18.Both arrays and lists may be referred to in algebraic syntax, i.e., 'L(3)'
returns the 3rd element in array or list L.
19.ALPHA key now switches between the three modes of input.
20.Flag 46 set/clear controls wraparound on/off of GETI/PUTI functions.
21.Flag 47 set/clear controls doublespace printing on/off functions.
22.DGTIZ function enables interactive plot digitizing from within a running
program.
23.The 28S display glass is non-glare, while the 28C glass is ordinary.
24.Spaces between +, -, *, /, and ^ and previous and next character in display
are now automatically inserted by the calculator in ALPHA entry mode.
25.RND function now works on arrays and complex objects as well as reals.
I hope this helps somewhat. More differences are discovered daily..
Jake Schwartz