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Amiga computer related discussion => Amiga Hardware Issues and discussion => Topic started by: soviet on September 13, 2008, 09:42:21 PM

Title: Amiga 500 to 4000 keyboard hack.
Post by: soviet on September 13, 2008, 09:42:21 PM

Hello, i´m finishing an Amiga 4000 tower proyect.
One last detail i get i´am using currently a hacked amiga 500 keyboard connected to the 4000 port.
But i can´t reset from the keyboard the pinout at hwb don´t mention any of the pins as reset?

When i press amiga amiga ctrl the caps lock led flash 2 times like sending the reset signal but i have the reset pin disconnect so no reset.

1    /DATA       Data
2    n/c    -    Not connected
3    GND       Ground
4    +5V       +5 Volts DC (100 mA max)
5    CLOCK       Clock
6    n/c    -    Not connected

The amiga 500 keyboard connector use pin 3 as reset line.
How the amiga 4000 original keyboard reset?.

The pinout at hwb is ok ?, or one of the n/c lines is keyboard reset?.

Theres some hack or mod to add a reset switch connected to the amiga 4000 motherboard ?.


Thanks

 :-D

Title: Re: Amiga 500 to 4000 keyboard hack.
Post by: Zac67 on September 13, 2008, 10:32:21 PM

An A500 keyboard on a 4000? OMG!

'Keyboard reset' _KBRST is generated through Fat Gary, so possibly it's regenerated from the KBCLK signal - I've always thought this method had only been used on the A1000, but as it seems all big box machines share it.

You can try connecting the keyboard's reset line to _KBCLK with a diode, hopefully this will cause a long enough low to trigger the reset.

Title: Re: Amiga 500 to 4000 keyboard hack.
Post by: soviet on November 10, 2008, 04:18:20 PM

Thanks zak for the info, i'm going to try and confirm this.