The memory can be relocated by m/c programming to any area in RAM; five bytes are required for each FP number location. There are only six locations in the MEMBOT system, butif memory is relocated 340F get-mem and 342D st-mem can address up to 32d locations through calls by CALCULATE literals, and up to 33h/51d locations by direct calls, see entry on get-mem. MEM is reset to 5C92 MEMBOT each time 16C5 SET STK is called. The memory is temporarily relocated in the ROM by 1D16 FREORDER, leading into 1D34 F L&S, see under 1D03 FOR; here 15d places in a FOR ... NEXT loop control variable are made into a memory area for the VALUE, LIMIT, and STEP of the loop. Written by: 16C5 SET STK 1D16 F REORDER 1DAB NEXT Read by: 340F get-mem 342D st-mem MEMBOT system variable 5C92 Bytes: 1Eh/30d The area set aside for the calculator memory; see 335B CALCULATE and MEM above. Usually it is written to by 342D st- mem and read by 340F get-mem, but of course it can also be written or read directly: either straightforwardly, for example 5CAC the second byte of mem-5 is set at 2E56 PF LARGE, or using the IY index. Since IY is set at 5C3A, MEMBOT is IY+58h, and forexample the first byte of mem-2 is IY+62h; see 235A C ARC GE1. The MEMBOT area can also be used for other purposes, provided it doesn't matter that the calculator memory will be corrupted. Eg in ROM: - the first eight bytes are used to construct a character form for one of the standard "graphics" at 0B24 PO ANY - the first five bytes are used as a spare calculator stack for line numbers at 19FB E LINE NO - the first byte is used as a flag at 2D55 E SAVE - mem-3 and the 14d bytes following are used as a print buffer for number print-outs by 2DE3 PRINT FP and following. Written by: 0B38 PO GR 1 (with 0B4C PO GR 3) 235A C ARC GE1 2D55 E SAVE (with 350B FP 0/1) 2E24 PF SMALL 2E56 PF LARGE 2E7B PF BITS 2E8A PF BYTES 2EA9 PF INSERT 2EB8 PF ALL 9 2EEF PF FR EXX 2F18 PF RND LP 2F25 PF R BACK 2F2D PF COUNT Read by: 03F8 BEEP 0B24 PO ANY (with 0B7F PR ALL, etc) 16C5 SET STK 19FB E LINE NO 2E24 PF SMALL 2E56 PF LARGE 2E8A PF BYTES 2EB8 PF ALL 9 2EDF PF FRN LP 2EEF PF FR EXX 2F0C PF ROUND 2F2D PF COUNT Rems: 16C5 SET STK value of MEMBOT put in MEM 19FB E LINE NO value of MEMBOT put in STKEND 2DE3 PRINT FP ad hoc print buffer at MEMBOT 2E6F PF MEDIUM used to store integer part of number memory (calculator) see 335B CALCULATE MEMORY LOCATION SUBROUTINE see 3406 LOC MEM
