Re: VM02 Beta 1

["John B. Matthews" <nospam@nospam.invalid>]

In article <ZTvzk.307$W06.20@flpi148.ffdc.sbc.com>,
 David Schmenk <dschmenk@YUCH.gmail.com> wrote:

> John B. Matthews wrote:
> > I'm puzzled by Hello.java setting 80-column mode with "vm02.call(0, 
> > 0xC300);" commented out. What switches it to 40-columns after 
> > entering a name?
> 
> Ah, yes.  Good eye!  When adding the device driver code, I cleaned up 
> some of the work-arounds I had.  For the system I/O classes 
> (System.out/in) I check for an 80 column card during object 
> initialization and set it automatically.  If you choose to use the lower 
> level conio class, you will have to set 80 column mode explicitly with a 
> tex80() call.  I thought this would be a good compromise.  Setting the 
> mode back to 40 columns required the disable-80-column-mode control 
> sequence (I send the codes for all the cards I know about).  Here's the 
> rub - I only have the ref manuals for the IIe/IIc video card and a Videx 
> 80 column card.  So if you have a different card that uses different 
> control codes, it probably won't work.  Send me the codes and I can add 
> them. You may see the codes printed out briefly, but I then print 
> backspaces to cover them up :-)  I currently have one monolithic driver 
> for the console, but when I get more information about the different 
> cards, I will write a driver for each specific card to reduce the memory 
> footprint.
[...]

I get similar results on KEGSMAC or KEGS-OSX, which emulate a //e 80 
column card (ctrl-Q -> 40-columns, ctrl-R -> 80 columns, ctrl-U -> quit, 
etc.) I see LDA #26 in vm02.s under VM_WARMINIT, which does clear line 
on the //e 80 column firmware.

I see my MACHID ($BF98) is $B3 (%10110011), suggesting a 128K //e with 
80 columns and clock.

110 * (Bit 3 off) BITS 7,6-  00=II  01=II+   10=IIe   11=/// EMULATION
111 * (Bit 3 on)  BITS 7,6-  00=NA  01=NA    10=//c   11=NA
112 *             BITS 5,4-  00=NA  01=48K   10=64K   11=128K
113 *             BIT  3  -  Modifier for MACHID Bits 7,6.
114 *             BIT  2  -  RESERVED FOR FUTURE DEFINITION.
115 *             BIT  1=1-  80 Column card
116 *             BIT  0=1-  Recognizable Clock Card

I'll poke around in io.s to see if anything jumps out.

-- 
John B. Matthews
trashgod at gmail dot com
home dot woh dot rr dot com slash jbmatthews