My first ever Hanimex programmable, sent to me by a fellow calculator enthusiast, turned out to be a close relative to another recently acquired machine, the Citizen SR-59. Since Hanimex is a known OEM label, it is an easy guess that this machine was probably made by Citizen; this suspicion is reinforced by the fact that the manual calls the machine a PSR-98, which is very much like a Citizen model number.

Like the SR-59, the SPC 1090 has a 45-step program memory, divided into two program areas. Another similarity is the way conditional and unconditional transfers are implemented, as relative jumps within plus or minus 9 program steps of the current program location.

The program example I wrote for the SR-59, an implementation of the incomplete Gamma function, runs well on this machine also. The program is relisted here, using the keyboard mnemonics of the SPC 1090, which are slightly different from the SR-59's mnemonics.

To use this program, enter the integration limit, his MIN, then enter the argument, and hit RUN1. For instance, if you type 30 MIN .5 RUN1, after a couple of minutes (yes, the iteration takes a little time) the square root of pi should appear on the display, which of course is none other but the Gamma function of 0.5.

01:  STO
02:  2
03:  MR
04:  STO
05:  1
06:  yx
07:  RCL
08:  2
09:  ÷
10:  RCL
11:  1
12:  ex
13:  ÷
14:  RCL
15:  2
16:  =
17:  STO
18:  3
19:  MIN
20:  RCL
21:  3
22:  ×
23:  RCL
24:  1
25:  ÷
26:  (
27:  GOTO 1
28:  GOTO -9
29:  RCL
30:  2
31:  +
32:  1
33:  )
34:  STO
35:  2
36:  GOTO 1
37:  GOTO -9
38:  +
39:  STO
40:  3
41:  MR
42:  =
43:  x<=M 1
44:  GOTO -7
45:  MR