fred@cbmvax.UUCP (Fred Bowen) (09/16/87)
Several people have asked how to tell whether their disk drive has the latest ROM in 'em, without having to open the case and look. The following program is a modified version of something I posted many moons ago which does just this. It is also useful for determining the disk type without sending a drive a "UJ" (soft reset) and reading the power-up message (possibly screwing up the soft-set unit number, etc.). It runs on both C64 and C128 systems. Please note that future ROM releases (gawd- I hope not!) may cause this code to be inaccurate. 10 REM CHECK DISK TYPE F.BOWEN 09/15/87 20 REM 30 REM THIS PROGRAM WILL IDENTIFY THE 40 REM CBM DISK TYPE BY CHECKING THE 50 REM DRIVE'S CHECKSUM BYTE. 70 REM 100 INPUT"CHECK WHICH UNIT";U: OPEN8,U,15 110 PRINT#8,"M-R"CHR$(00)CHR$(192)CHR$(2): GET#8,A$,B$ 120 PRINT#8,"M-R"CHR$(47)CHR$(255)CHR$(1): GET#8,C$ 130 CLOSE8 140 : 150 A=ASC(A$):B=ASC(B$):C=ASC(C$): REM ADD +CHR$(0) IF C64 160 : 170 IF A<>151 THEN 230 180 IF C<>169 THEN PRINT"1541" : END 190 IF B= 70 THEN PRINT"1541B- WITH UPDATE" : END 200 IF B= 170 THEN PRINT"1541B- NEEDS UPDATE": END 210 IF B= 224 THEN PRINT"1541-II": END 220 : 230 IF A=56 THEN PRINT"1571- WITH UPDATE": END 240 IF A=66 THEN PRINT"1571- NEEDS UPDATE": END 250 IF A=132 THEN PRINT"1571CR": END 260 : 270 IF A=192 THEN PRINT"1581": END 280 : 290 PRINT"UNRECOGNIZED DRIVE" -- -- Fred Bowen uucp: {ihnp4|rutgers|caip}!cbmvax!fred arpa: beats me tele: 215 431-9100 Commodore Electronics, Ltd., 1200 Wilson Drive, West Chester, PA, 19380