10REM Simple loader program 20REM (C)1996 SPROW 30MODE4:PRINT"Searching" 40DIMwriteable% 128 50IFINKEY(-256)=253 THENPROCmaster:EN D 60IFINKEY(-256)=255 THENPROCbbcorelk: END 70IFINKEY(-256)=1 THENPROCbbcorelk:EN D 80: 90DEFPROCmaster 100FORS%=7TO4 STEP-1 110IFFNoccupied(S%)=FALSE THENOSCLI"SR LOAD SNAPIT 8000 "+STR$(S%):OSCLI"INSERT "+STR$(S%):PRINT:PRINT"Press CTRL-BREAK to initialise":ENDPROC 120NEXT 130PRINT:PRINT"No free sideways ram ba nks":ENDPROC 140: 150DEFPROCbbcorelk 160FORS%=15TO0 STEP-1 170IFFNanyswram(S%)=1 ANDFNoccupied(S% )=FALSE THENOSCLI"LOAD R.SNAPIT 8000":PR INT:PRINT"Press BREAK to intialise":ENDP ROC 180NEXT 190PRINT:PRINT"No free sideways ram ba nks":ENDPROC 200: 210DEFFNanyswram(socket) 220FORX=0TO2STEP2 230P%=writeable% 240IFINKEY(-256)=1 THENGOTO420 250IFINKEY(-256)=255 THENGOTO270 260: 270[OPTX:SEI:LDA&F4:PHA:LDA#socket:STA &F4:STA&FE30:CLI:½Set ROM reg to socket# 280LDA&8000:PHA:CLC:ADC#1:STAcopy 290.writeto 300STA&8000:LDA&8000:CMPcopy 310BEQtrue 320.false 330PLA:PLA:STA&F4:STA&FE30:LDA#0:RTS 340.true 350PLA:STA&8000:PLA:STA&F4:STA&FE30:LD A#1:RTS 360.copy 370EQUB0 380] 390NEXT 400=USRwriteable% AND&FF 410: 420[OPTX:SEI:LDA&F4:PHA:LDA#12:STA&FE0 5:LDA#socket:STA&F4:STA&FE05:CLI:½Dummy move takes out BASIC then set ROM reg to socket# 430LDA&8000:PHA:CLC:ADC#1:STAcopy 440.writeto 450STA&8000:LDA&8000:CMPcopy 460BEQtrue 470.false 480PLA:PLA:STA&F4:STA&FE05:LDA#0:RTS 490.true 500PLA:STA&8000:PLA:STA&F4:STA&FE05:LD A#1:RTS 510.copy 520EQUB0 530] 540NEXT 550=USRwriteable% AND&FF 560: 570DEFFNoccupied(socket) 580A%=170:X%=0:Y%=255:R%=USR&FFF4:REM Read pointer to start of ROM info table 590X%=(R% AND &FF00)DIV&100 600Y%=(R% AND &FF0000)DIV&10000 610=?((256*Y%)+X%+socket)