AMIGA 500 - SWITCHLESS BOOT SELECTOR

(3 RESET BOOT DRIVE SELECTOR)

Hello,

This circuit board is tested with Amiga 500 (v1.2 - v1.3) and it is working perfectly.

"A500 - Switchless Booter" is a circuit for changing boot priority of floppy drives, for Amiga 500.

If you use a second floppy drive connected to your A500, like GOTEK Drive or a mechanical floppy drive, (as DF:1), then you need a boot selector to boot from the second drive. (Most of old boot selectors work with a toggle switch.)

While using "3 RESET BOOT DRIVE SELECTOR", if you want to toggle your floppy drives (DF:0 <> DF:1) you just need to press Reset keys 3 times, or instead of 3 times, you can press continuolusly reset keys for about 4 second. (Reset Keys are: CTRL and the two Amiga keys together) . 30 seconds after last reset, counter sets itself to zero.

Benefits of Switchless Boot Drive selector:

1) This "A500 - Switchless Booter" protects your Amiga 500. If you change the mechanical switch position while transfering data from floppy drive, this may cause damage to 8520 (Even CIA) or 5719 (GARY). Switchless booter do not let this happen.

2) Most users need to make a hole on their Amiga 500 for attaching boot selectors mechanical switch. This "A500 - Switchless Booter" toggles drives elecronicaly, there is not any mechanical switch, so you do not need to make a hole on your your Amiga.

This circuit has a PIC16F628A (programmable chip) , you need to download .HEX file, and program it in to PIC16F628A, from the bottom of this page.

Round headers will be better to fit CIA socket.

COMPONENTS:

PIC16F628A or PIC16F628 (Requires Programming)

74HC4066 (M74HC4066B1) ( Do Not Use CD4066 ! )

2PCS. 20 PIN ROUND MALE HEADER (Get a 40 pin and cut it)

DIP 40 IC SOCKET

DIP 18 IC SOKKET

DIP 14 IC SOCKET

2PCS. 100nF CAPACITOR

3 Volt or 5 Volt Active Buzzer (optional)(3V beeps louder than 5V)

You will need a pic programmer to program PIC16F628A.

12.06.2024 (Optional Firmware and Hardware Upgrade)

Audible warning (Beep) mode when changing boot drive

(Two beeps for external drive, one beep for internal drive)

You must use 3V or 5V Active Buzzer. (3V beeps louder than 5V)

Download the new .HEX file and program it into the PIC chip

Solder Positive (+) pin of Active buzzer to PIC chip pin-14,

and solder the other pin of the buzzer to PIC chip pin-17

The other version (retro version) of this project is here:

https://www.pcbway.com/project/shareproject/_DIY_AMIGA_500_SWITCHLESS_BOOT_SELECTOR_Rev_3_RETRO_VERSION_of_3_RESET_BOOT_2056c6f8.html

In order to protect your electronical devices, always turn off your Amiga before connecting or disconnecting the cables or any other device.

Gerber files and component list are subject to change without notice. Before paying for the PCBs, be sure to update your orders!

Use this PCB at your own risk !

Have fun

Thank you.

C64istanbul