"Daisy" - chaining the Mitsumi Internal CD-ROM ---------------------------------------------- (c)1993 Chuck Saylor - Sysop COMM-LINK BBS 812-591-2353 14,400 v32/42 PO Box 438 Westport, In 47283-0438 ------------------------------------------------------------------- This information "should" work on any "clone" of this CD-ROM drive. ------------------------------------------------------------------- All companies and/or copyrights referred to in this document are hereby acknowledged. (I didn't have a list of addresses handy). Disclaimer: I accept NO responsibility for any damages that may result from the use of this information. It works on my system, I hope it works as easily on yours. Use this at your own risk. ------------------------------------------------------------------- This document and it's information is considered shareware, please treat it as such. Feel free to upload it to your favorite bbs. ------------------------------------------------------------------- Customary Plea for Bucks: I fully realize that there are thousands, if not millions of these cd-drives installed in an equal number of computers... therefore, if I (as a Computer Technician) were to charge you for this, I'm sure you would understand why. However, I can't get to all of you, and you can't get to me, so just send me $5.00 for the headache I saved you and we'll call it even. =================================================================== It has been "claimed" that the Mitsumi CD-ROM cannot be daisy-chained, this is not so. The key to this, is to avoid DMA and IRQ conflicts, with other devices already installed in your system. As of this writing, I am running 2 of these drives on my system, they're drive D: and drive E: The downside to this, is that you need a seperate expansion slot for each controller card... and you MUST use Microsoft CD-ROM Extentions v2.2 (the disk is label CD-ROM Device Driver v1.3). Later versions that I tried this on, didn't work properly. Also note that I have not been able to successfully load the drivers "high" in QEMM's Optimize. The machine currently has 4 meg of ram. They WILL load high, releasing an additional 77k of lower ram, but doing so, results in "Invalid Drive Specification" messages from dos. In other words, dos doesn't reconize (read) the cd-drives. I don't, as yet, have a explaination for this, but 77k is not too much to sacrifice for the advantages of an additional cd-drive. ------------------------------------------------------------------ If you don't know your system inside out, or aren't a technical person, don't attempt this! - Get PROFESSIONAL assistance! BACKUP YOUR "current" AUTOEXEC.BAT and CONFIG.SYS files to a BOOTABLE floppy FIRST!! - DISASTERS can and do happen - BE PREPARED!! IF this is NOT done right the FIRST time, your system will LOCK-UP when you re-boot!! You'll need this disk to re-gain control!! Installation Instructions ------------------------- MAKE the BOOTABLE floppy, described above, BEFORE you continue!! ================================================================ Assuming that you have previously installed the Microsoft Extentions software, using the default installation directories, and selected DMA transfer, proceed as follows... 1) Configure "card #1" (first drive) to the factory defaults (as came out of box)... IRQ - 5 and CH - 3 SW1 settings (1-8) - 00000011 (address 300h) 2) Configure "card #2" (second drive) to the settings... IRQ - 2 and CH - 1 SW1 settings (1-8) - 00100011 (address 310h) * The CD-ROM manual lists the SW1 settings in REVERSE order! These are "looking at the board" settings! (DipSwitch #1 on the left, 0=OFF and 1=ON). 3) Add/Edit the line below to your AUTOEXEC.BAT \BIN\MSCDEX.EXE /D:MSCD001 /D:MSCD002 4) Add/Edit the following lines to your CONFIG.SYS LASTDRIVE=Z (probably already there) DEVICE=\DEV\MTMCDD.SYS /D:MSCD001 /P:300 /A:0 /M:32 /T:3 /I:5 DEVICE=\DEV\MTMCDD.SYS /D:MSCD002 /P:310 /A:0 /M:32 /T:1 /I:2 /L:E Ú DON'T ³ MS Ext. Device Driver Ù ³ ³ ³ ³ ³ ³ ENTER ³ I/O Address Ù ³ ³ ³ ³ ³ THIS ³ Audio CD-Play Settings Ù ³ ³ ³ ³ PART! ³ Memory Buffer Ù ³ ³ ³ FOR ³ DRQ/DMA Ù ³ ³ YOUR ³ IRQ Ù ³ INFO ³ Drive Letter Ù ONLY! ³ À The first DEVICE line installs the first CD-Drive as drive D, the second line installs the second drive as drive E. (Consult the CD-ROM manual for more info on these settings). ------------- SPECIAL NOTES ------------- * If you are installing both drives for the first time (in a new installation) use the CD-ROM setup disk to install the software drivers FIRST, then edit the 2 files as shown above. * If you have 2 hard drives, and/or are using a "Stacker" type utility, change the "E" in CONFIG.SYS's /L:E to the next available drive letter. In other words, set this to F (or whatever is appropiate) for your system. * Also note that depending upon your particular configuration, you may have to experiment with (decrease) the "memory buffer" settings, to achieve optimum performance. * Some bios chips (such as the AMI) revector IRQ 2 as IRQ 9. My system has this chip. This means that if IRQ 2 is already in use, (Desqview uses this IRQ), the bios will automatically revector the second device on IRQ 2 to IRQ 9. The result is that both devices run as they should, even though the IRQ's would normally be in conflict. If your bios chip supports IRQ 9 directly, and/or you purchased the Mitsumi "clone", you may be able to use IRQ 9 directly on the controller card. Consult your cd-drive's manual. ------------- * Did you make that BOOTABLE floppy ??? ------------- 5) Re-boot your system, if all went well, you should now have 2 cd drives installed. If it didn't work, check the files you edited for proper syntax, and your system for DMA/IRQ conflicts with other devices. ------------- Chuck Saylor (Sysop) COMM-LINK BBS 812-591-2353 -EOF- *03/18/93*