Anyway, here are some bits & pieces about the Casio FZ-1.

Suggestions, questions, acclamation, or simply curiosity about who that guy is you might want to place here:

rainer@buchty.net

ROM #1 (FZ1S)
ROM #2 (FZ2S)

How to replace the FZ-1 disk drive by an ordinary 3.5" PC HD drive or adjust the FZ-1's drive's rotation speed

When your FZ-1 keyboard jams the whole machine...

Upgrading your FZ-1 to 4 Megabytes using standard 30pin SIMMs (case study)

Adding an IDE-Interface to your FZ-1 for (easy?) hard disk access (case study)

Change the FZ-1 drive to match a PC drive's rotation speed. That way you can easily read/write FZ-1 disks on Linux systems the following way:

1. Create an according disk device, e.g. mknod /dev/fd0fz1 b 2 40
2. Configure the device: setfdprm /dev/fd0fz1 ds hd sect=16
3. You can now dump disks using dd on /dev/fd0fz1 (bs=1024, count=1280)
4. Also low-level formatting works using superformat, however for proper formatting formatting you also need to write the three management sectors. Without that, the FZ-1 won't recognize the disk as formatted.
(2017-07-21)

The FZ-1 Toolkit: Reading and Writing FZ-1 disks under Linux (heavily alpha, includes handling of FZF dumps)

(2000-10-11)

Change a PC disk drive to read original FZ-1 disks

(2002-04-02)

• Main board schematics
• Service manual
• For the FZ20m service manual and schematics, have a look here.
• Optional Software Bundle including the SCSI driver disk (HDD Operator).

• uPD765 (Floppy Controller)
• Programming Information for 765 and its successors
  
  
• uPD72055/8255 (I/O Controller)
  
  
• uPD72016/NEC V50 (Microprocessor)
• Programming Information for NEC V50
  
  
• GAA/GAB/GAX (sound generation)
• MB87186 (DCF/DCA)
  
  
• HD44350/351 (display controllers)
  
  
• Keyboard controller
  (and troubleshooting)
  

• ROM routines
• RAM variables and data structures
• Casio's Programmer Reference for FZ-1 Software Development
• Some time ago I did a first attempt at disassembling the ROM, if you want to continue where I stopped, here's the code
  Check with me before you waste your time, I've come a long way since then :)
• Description of the FZ-1's disk format

The lower I/O memory area is divided into 16 chunks of 8 bytes created by a 74HC154 as follows:

• 0x00: GAA
• 0x08: GAB
• 0x10: FDC
• 0x18: I/O1 (72065 #1)
• 0x20: I/O2 (72065 #2)
• 0x28: n/a (hack our own stuff here ;)
• 0x30: SCSI (FZ20m only)
• 0x38: SCSI (FZ20m only)
• 0x40: STB (external port enable)
• 0x48: n/a
• 0x50: n/a
• 0x58: n/a
• 0x60: ADST (A/D conversion start)
• 0x68: ADRD (A/D conversion read)
• 0x70: LCDWR (write to LCD "GAL")
• 0x78: LEDWR (LED latch write / 74174)
• 0x80: DCA volume
• 0x90: DCA gain
• 0xa0: DCF frequency
• 0xb0: DCF resonance

In addition, there's the V50's internal devices located at the following addresses:

• 0xc0: Timer (TCU)
• 0xd0: UART (SPU)
• 0xe0: Interrupt controller (ICU)
• 0xf0: DMA unit (DMAU)
  (only used w/ SCSI driver)
• 0xfff0: I/O configuration space

Plenty of space for hooking in own extensions! As can be seen, SCSI occupies 16 addresses in total in order to fully access all MB8932 registers.