BASIC on / off from DOS XL commandline#
for DOS XL and OS/A+, may also work on SpartaDos and other Commandline DOS Versions
00010 ;SAVE"D:BASIC.SYN 00020 .LI OFF 00030 ; This program checks the OS/A+ 00040 ; command input buffer, and 00050 ; then either removes or 00060 ; installs the BASIC rom on 00070 ; XL series computers. It 00080 ; does this by setting BASICF 00090 ; then executing a warmstart, 00100 ; to reset the OS variables for 00110 ; the correct RAM size. 00120 ; 00130 ; TYPE: 00140 ; BASIC I for BASIC in. 00150 ; BASIC O for BASIC out. 00160 ; 00170 ****************************** 00180 * Daniel L. Moore 03/17/84 * 00190 ****************************** 00200 ; 00210 BOOT .EQ $9 00220 DOSVEC .EQ $A 00230 DOSINI .EQ $C 00240 ; 00250 LOADFLG .EQ $CA rev A,B BASIC 00260 ; 00270 VECTMP .EQ $D4 FP register 0 00280 INITMP .EQ $D6 00290 ; 00300 BASICF .EQ $3F8 00310 ; 00320 DOSINIT .EQ $7E0 for FMS v.2 00330 ; OS/A+ equates. 00340 CPBUFP .EQ $A next char. 00350 CPCMDB .EQ $3F command buff. 00360 ; 00370 .OR $4000 00380 ; 00390 ; Test for XL series computer 00400 START LDA $FCD8 00410 CMP #$A2 00420 BEQ DOS 00430 ; Save run vector 00440 LDA DOSVEC 00450 STA VECTMP 00460 LDA DOSVEC+1 00470 STA VECTMP+1 00480 ; Save init vector. 00490 LDA DOSINI 00500 STA INITMP 00510 LDA DOSINI+1 00520 STA INITMP+1 00530 ; Check the command input 00540 ; buffer for an 'I or 'O. 00550 LDX #1 assume OUT 00560 LDY #CPBUFP 00570 LDA (DOSVEC),Y 00580 CLC 00590 ADC #CPCMDB+1 00600 TAY 00610 LDA (DOSVEC),Y 00620 CMP #'O out? 00630 BEQ SET.IT 00640 DEX 00650 CMP #'I in? 00660 BEQ SET.IT 00670 ; Not 'I or 'O, exit to CP/A. 00680 RTS 00690 ; Set BASIC in/out. 00700 SET.IT STX BASICF 00710 LDA #$32 clear cmnd 00720 STA (DOSVEC),Y 00730 ; Set init/run vector to 00740 ; continuation code. 00750 LDA #CONT 00760 STA DOSVEC 00770 STA DOSINI 00780 LDA /CONT 00790 STA DOSVEC+1 00800 STA DOSINI+1 00810 ; Set BOOT to succesfull disk 00820 ; boot so SynAssembler will not 00830 ; attempt to run. 00840 LDA #01 00850 STA BOOT 00860 ; Let the OS switch BASIC, 00870 ; reset the memory size, and 00880 ; open E: at the new RAMTOP. 00890 JMP $E474 Warmstart 00900 ; 00910 ; Restore init/run vectors. 00920 CONT LDA VECTMP 00930 STA DOSVEC 00940 LDA VECTMP+1 00950 STA DOSVEC+1 00960 LDA INITMP 00970 STA DOSINI 00980 LDA INITMP+1 00990 STA DOSINI+1 01000 ; Init DOS ($7E0 for FMS.) 01010 ; If you are running OS/A+ v.4 01020 ; add DOSINIT JMP (DOSINI) 01030 ; after the label DOS, and 01040 ; delete the DOSINIT equate 01050 ; above. 01060 JSR DOSINIT 01070 ; If BASIC IN, then set BASIC 01080 ; 'load in progress' flag, so 01090 ; all BASIC work areas will be 01100 ; cleared. (force a NEW) 01110 LDA BASICF 01120 BNE DOS 01130 LDA #$FF 01140 STA LOADFLG 01150 ; Return to DOS. 01160 DOS JMP (DOSVEC) 01170 ; 01180 ; 01190 END .LI ON
