+The following was a change log of the CCI "tahoe" porting.
+
+
+04/27 Rewrote fixmask.c to properly preserve r6 and r7. This method used should
+have been used for the Vax; as it was, one had to count the number of register
+variables declared in a function, and fixmask rebuilt the savemask from
+scratch. This was a little bit kludgey; the new version simply OR's in
+the two registers into the mask.
+
+04/29 Replaced assembly version of exarith() with exarith.c from the 68k port,
+with the call to emul() replaced my an asm(). Still slower than original vax.
+
+05/02 Repaired fixpbig.e, the sed(1) script that replaces certain function
+calls with inline code and fast subroutine calls (the vax "jsb"), as well
+as changing all references to "np" and "lbot" to r6 and r7. The fast calls
+are gone, because the tahoe isn't capable of such things. The rest were
+changed to reflect different calling strategies.
+
+08/29 Added an "#ifdef tahoe" to alloc.c which uses the original "ftstbit"
+and "setbit" macros included in the source. The vax version uses asm()'s,
+but I don't know the instruction set of the tahoe well enough to improve
+on the macros' code.
+
+09/04-09/08 Replaced more functions from bigmath.c with C versions from the
+68k port. ediv() and emul() calls were replaced with more asm's. Others were
+moved into their own source files and used as they were.
+
+09/10 Replaced Pushframe() and Iretfromfr(). The original Pushframe depended
+on being called by a jsb. The new version makes the best of what it can
+get from the standard call frame, and changes it around to match what's needed
+(as specified in frame.h). Iretfromfr() was moved from frame.c, and had
+asm's added to replace the qfunction it called. This basically just undoes
+Pushframe().
+
+09/10 GOT RAWLISP RUNNING! Version as of this afternoon would print a banner
+and allow one to eval a few S-expressions. Problems seem to include: stringing
+back through the stack frames, ediv reserved opperands, who knows what else.
+
+09/18 Ediv requires that all of its arguments be registers. (Except for the
+divisor, I think.) Very poorly documented. (as(1) doesn't compain. adb(1)
+disassembles it properly. The architecture manual gives no indication of this.)
+Now one can type numbers into the reader without getting a core dump, and
+even do simple fixnum arithmetic.
+
+09/18 Due to a typo Iretfromfr() was putting the old value of fp into r12
+and not restoring fp at all. I don't yet know what problems this was causing.
+
+09/18 /lib/c2 is optimizing away the "fixpbig.e" substitution of
+calls to sp() ==> "movl sp,d0". Since "sp" is not a valid second
+argument to subl3 (again no assembler complaints), another illegal instruction
+core dump occurrs. Fixed by replacing "movl sp,d0" with "moval (sp),d0".
+
+09/18 I can't figure out WHAT ediv's opperands are allowed to be. I'll
+just fix those asm()'s until everyting works.
+
+09/18 Bignum division problems:
+;; On a vax:
+Franz Lisp, Opus 38.79
+-> (quotient 999999999999 25)
+39999999999
+->
+;; On the tahoe:
+Franz Lisp, Opus 38
+-> (quotient 999999999999 25)
+198085033769738295431766579
+->
+
+09/18 /lib/c2 was optimizing away another set of asm() constructs - in
+this case the setting of r0 to the error frame location. "retfrom.s" is
+the new, replaced version of Iretfromfr().
+
+09/23 the ER% variables are not being correctly set to nil.
+Cf. "sysat.c". Created raw.l to setq them, and discovered in
+the process that semicolon hasn't got its readmacro properties
+set up right. Flonums don't print correctly (always as ".0")
+but seem to be capable of being added and comparred correctly.
+
+09/24 Went through lots of code and found that the ER% variables
+ARE being set correctly. The garbage collector, however, seems to be
+trying to trash them and return them to the freelist, therefore their
+value cells are being turned into freelist pointers. Removing the sweep
+phase from gc1() seems to remove both this problem and the spontaneous
+readtable disappearance. The 'ftstbit' and 'setbit' macros are suspected
+as being the culprits.
+
+09/24 Still suspecting something about the marking phase of gc1(). The
+dumps looked awfully suspicious.
+
+09/25 The marking phase, and in particular the bitset macros, were probably
+indeed at fault. The macros used the ordinary Motorola-type non-reversed
+byte order, while the code that read the bitmaps had been rewritten since
+they had, and used the Vax reversed byte order. Rewrote the macros to
+no longer use bytes.
+
+09/25 Created "snlisp", the totally interpreted version of Franz. Works
+fine except for the previously known bignum division bug and for cfasl'd
+functions.
+
+09/26 Fixed cfasl'd function error. callg_() was pushing its arglist
+onto the stack in reverse order.
+
+09/30 Reworked int:showstack, and added it to snlisp. A real mess (even
+worse than it was before for the vax).
+
+09/30 Fixed the bignum division bug. In mlsb() a function call was incorrectly
+translated into an asm("ediv..."). This is the last known Franz bug as
+of now.
+
+10/23 RCS'd Liszt, and conditionalized it for the tahoe. Should work
+identically as before, as a VAX cross-compiler. As a tahoe native compiler,
+it still needs some work.
+
+11/08 Discovered that a problem with Liszt was that fixnum subtractions were
+not being done properly due to a ***SEVERELY BRAIN DAMAGED BROKEN EMUL
+INSTRUCTION***. Turned faulty emul instructions into calls to emul()
+which replaces the sign-extend-and-add functionality of the emul instruction
+with a manual 64-bit add. Bignum divisions resulting in a negative number
+were broken too.
+
+11/10 Changed predecrement and postincrement modes in the compiler to make
+up for the lack of same in the Tahoe instruction set.
+
+11/13 ** Found that the emul instruction problem was present only in the old
+WCS**. When the machine was rebooted this afternoon the problem went away.
+Calls to emul() will be turned back into asm's.
+
+11/14 Changed Lfasl() so that relocation of addresses works when an address
+is not longword aligned. Also cleaned up the indentation.
+
+11/16 Fixed Liszt and changed qlinker() to change the method of function
+linkage, again because of alignment problems.
+
+11/18 General repairs to fasl.c, and fixed a stupid quotemark typo (on my
+part) in Liszt. Tried to port /usr/lib/lisp/autorun/tahoe.
+
+12/5 Made various changes to liszt. Output works mostly most of the time,
+but some things (read: nliszt) dump core.
+
+12/8 Fixed liszt and qfuncl.c to remove shal instrucitons with negative
+arguments, since these indescriminately mess up their opperands somehow.
+Also changed subl2 in /usr/lib/lisp/autorun/tahoe with destination
+sp, because subl2 doesn't seem to work on r14. r14 doesn't work as a source
+opperand to movl either. Beats me why, I just fix 'em 'till they work.
+
+12/11 Looking for a bug which causes nliszt to bomb on any functions with
+more than one argument.
+
+12/13 Above bug was caused by yet another missed postincrement instance.
+Moved the postincrement handling around. Also ported code to handle &form
+variable arguments.
+
+12/14 Repaired code for (\\ x y)... compiled output did an ashq and an ediv
+on an odd register.
+
+12/16 Fixed a missed register save mask in one of the qfuncls. Added a missed
+".align" to the code that handles &forms.
+
+12/17 Added r12 to qlinker's save mask. Added register mask for local functions
+since they are now being called with calls's.
+
+12/18 Added register save masks to local functions.
+
+01/12 The _tynames table didn't have a necessary ".align 2" before it. This
+was messing up compiled functions that called typep (causing align faults).
+
+
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