Amiga hardware info, help and support with a focus (but not limited to) North American NTSC experiences. Open to all.
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jiggoly

by jiggoly posted Sat Mar 16, 2019 3:58 pm

Hi all, based on the EzdineG A1000 relocator I´ve made a remix Amiga 1000 relocator that includes a 27c160 EPROM (2MB) which can hold up to 4 different kickstarts. It also has a small board with a rotary switch to select the appropiate kickstart.
The installation is like EzdineG explained in another post, anyway here you have some pictures of the mod:

1 - Desolder U6J, put a socket and leave out the pin number 17
photo_2019-03-17_00-34-38.jpg


2 - Solder a resistor between pins 1 and 20 of U4K (I used a 4K7 1206 SMD resistor with 2 wires)
photo_2019-03-17_00-34-33.jpg


3 - Solder a wire to the via shown in the picture near U5M (I recommend to use a dupont wire and cut the connector of one side)
photo_2019-03-17_00-34-29.jpg
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jiggoly

by jiggoly posted Sat Mar 16, 2019 4:13 pm

4 - You must also remove the ODD (U5P) an EVEN (U5N) half kickstart from the board.

Here is the relocator
photo_2019-03-17_00-34-23.jpg


and the rotary
photo_2019-03-17_00-34-13.jpg


The EPROM must be programmed using an adaptor for the TL866II plus programmer like this one
Programmer.jpg


The 2 jumpers of A18 and A19 are used to select the address of the 512K for each kickstart using the same config as the rotary switch.
e.g,:
A18 = 0 : A19 = 0 ------ 1ST KICKSTART (1.3)
A18 = 1 : A19 = 0 ------ 2ND KICKSTART (2.05)
A18 = 0 : A19 = 1 ------ 3RD KICKSTART (3.1)
A18 = 1 : A19 = 1 ------ ROMDIAG or other

For the moment I´m uploading the project to my github so when it´s up I´ll post the link.
Update: Here is the link to github----https://github.com/CrackenDesigns/Amiga4Kickstart

Best wishes.
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intric8
Seattle, WA, USA

by intric8 posted Sat Mar 16, 2019 4:15 pm

This is a fabulous mod - thanks so much for sharing! Where are you going to mount the switcher?
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jiggoly

by jiggoly posted Sat Mar 16, 2019 4:18 pm

This is awesome - thanks for posting!

Are you selling your homebrew boards?


Couldn´t finish the post :lol:

As I said on the second post all the info will be shared and you can order your own board and build it. I have 9 left but I made a mistake with the panelization and the small rotary has a missing ground plane.

This is a fabulous mod - thanks so much for sharing! Where are you going to mount the switcher?


Thanks so much ;)

My plan is to make a 3D small box to stick with velcro or something to the amiga.
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intric8
Seattle, WA, USA

by intric8 posted Sat Mar 16, 2019 4:23 pm

Yeah sorry - I posted before I realized you were still at work. I quickly deleted it but ah well.

My plan is to make a 3D small box to stick with velcro or something to the amiga.

That's perfect. So cool!

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