Paper-Tape HP-BASIC info...
(incomplete, I have no docs to go by)

When entering code use underscore to logically erase
the previous character, use the shift squiggly thing
(next to 1) to abandon the line. This basic has only
numeric input, no strings besides PRINT, requires LET,
one statement per line. Variable names are a single letter
plus an optional digit, array names are a single letter.
The last line must be END. One or two dimension arrays
can be DIM'd, has matrix ops like MAT C = A + B to
operate on entire arrays at once, MAT A=ZER clears array.
Has floating point math and ops like SIN COS TAN etc.
Enter SCRATCH to erase the program in memory. PTAPE loads
a basic listing attached to PTR, the easiest way to save
a listing is LIST then copy/paste from the terminal to a
file. (PLIST writes to PTP but isn't readable). Lines
must be 72 chars or less, printed lines too or they will
wrap or ignore the ';' on the preceding line. BYE jumps
to mem loc 77 (OCTAL), stock is halt but a JMP 76,I can be
added here with loc 76 containing the address to jump to.

Run from 100 to initialize, run from 2050 to re-enter
and preserve the program in memory (READY doesn't show),
run from 5137 to execute the basic program. Typically it's
convenient to add JMP 3,I (124003) to location 2 and one
of these addresses to location 3.

Location 111 contain the location of the driver code, which
extends to the nearest 4KW boundary minus 101 to leave room
for the boot loader program. When a basic program is present
location 113 contains the end of the program. Location 110
contains the end of the basic interpreter.

The following keywords were found by dumping the binary
as text. The first 8 (RUN to BYE) are immediate commands,
the last 5 (ZER-TRN) appear to be matrix functions.

RUN        DEF        CALL        AND        LOG
SCR[ATCH]  REM        DATA        OR         ABS
LIST       GOTO       READ        >=         SQR
PLIST      IF         PRINT       <=         INT
PTA[PE]    FOR        INPUT       <>         RND
STOP       NEXT       RESTORE     TAB        SGN
TAP[E]     GOSUB      MAT         SIN        ZER
BYE        RETURN     THEN        COS        CON
LET        END        TO          TAN        IDN
DIM        STOP       STEP        ATN        INV
COM        WAIT       NOT         EXP        TRN

Some of these are self-explanitory if used to old-style
basics but others elude me.. like does CALL call ML and
how to do it, and if LISTing only some lines is possible.
In addition to this list the normal single-char functions
< > = + - * / ^ ( ) work as expected. <> converted to #.

The following procedure can be used to make a 28KW version of
papertape BASIC using the prepare.abs and hpbasic.abs files...

------- begin log --------
sim> set clk dev=10
sim> set tty dev=11
sim> set ptr dev=12
sim> set ptp dev=13
sim> load prepare.abs
sim> load hpbasic.abs
sim> attach ptp basic28.abs
PTP: creating new file
sim> d s 11
sim> run 2

 PHOTO READER I/O ADDRESS? 12
 PUNCH I/O ADDRESS? 13
 SYSTEM DUMP I/O ADDRESS?13
 CORE SIZE? 28

HALT instruction 102077, P: 16562 (JMP 16547)
sim> detach ptp
sim> d 0-77777 0
sim> load basic28.abs
sim> run 100

READY
------- end log ----------