Author Topic: FM Towns II BP60PB60C CD-ROM and SCSI CDROM info  (Read 99 times)

Offline sampson

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FM Towns II BP60PB60C CD-ROM and SCSI CDROM info
« on: March 10, 2019, 04:46:23 AM »
I've been working on repairing a FM Towns II MA and the last part is the CD-ROM which was unsuccessful. While the laser did burn out I grabbed pictures of all the components of the drive as well as identified all ICs/Capacitors I could. The motor for the CD-ROM is a Mabuchi RF-300PH-11400.

Gallery of pictures can be seen at https://imgur.com/a/fMIC1sH

IC/Cap list as follows:
CONTROLLER BOARD:
IC101 SHARP LZ95B32 9441U
IC102 TA7809F *3H

C101 16V 47uF
C103 6.3V 100uF
C114 16V 47uF

OPTICAL UNIT:
IC1 TECHNICS 8802SC 40.4
IC3 T94 17HB 4066BF
IC4 TECHNICS 8389S 499
IC5 C339G 9503RM18
IC7 358 446
IC9 TA78M05F *44
IC10 T94 22H 74HC74A
IC11 T94 27H 74H03A

C2 16V 22uF
C4 6.3V 100uF
C5 16V 100uF
C8 6.3V 100uF
C13 50V 1uF
C24 6.3V 100uF
C39 16V 47uF
C72 16V 47uF
C83 6.3V 100uF
C89 16V 47uF
C91 50V 4.7uF

As for the SCSI CD-ROM I came across a post on the internet which used the same driver used for the SCSI image here - http://ysflight.in.coocan.jp/FM/towns/cdsd/e.html

The difference however with this driver is that it provides fixes to CDSD.SYS and allows it to work perfect with CDDA. Since my CD-ROM is functional laser-aside I do not get the system halts with this setup unlike the previous image. There's still the same limitations as before with Ving games and various titles, I'm still investigating ways around that as a replacement laser doesn't seem possible. I also was able to restore the hard drive from the MA I purchased which came with a system setup for Towns OS 2.1 as well as Windows 3.1 including the capture software which is working with my card. It also has applications I haven't seen elsewhere like Photoshop 3.0 however I am working on cleaning out all identifying information before it can be posted. Currently I have it re-setup to take 2GB on SCSI2SD with a 128MB system partition, 800MB DATA/GAMES partition and 800MB Windows partition as well as moved the games from the SCSI image over to it.

Anyways I wanted to make sure this list made it somewhere and I can't be bothered to figure out how to post on a wiki so here you go.
« Last Edit: March 12, 2019, 01:49:32 AM by sampson »

Offline sampson

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Re: FM Towns II BP60PB60C CD-ROM and SCSI CDROM info
« Reply #1 on: March 11, 2019, 06:24:47 AM »
It's also worth noting that the Towns II CD-ROM and Marty CD-ROM share the same laser. I was able to harvest the laser from my Marty and my drive now reads music cds/data but cannot boot cds.

Edit: The computer is now fully repaired! Turns out a utility I had used to decrease boot times was rendering the CD-ROM un-bootable. I use FT16 (https://www.vector.co.jp/soft/towns/hardware/se052966.html) to force my memory check to complete instantly as it has 100MB in it. Turns out the -F flag enables FIFO mode which breaks the CD-ROM booting.

Aaaaaaaand the laser stopped working already. God these things fucking blow.
« Last Edit: March 12, 2019, 01:59:32 AM by sampson »