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Board REV1 Reference

Jumper configuration for the Retrowiki (REV1) Board version

Use a 20/24 pin ATX psu or an original A1000 psu with your A1100.

CAUTION: Test your A1000 psu with a volt meter before using it to avoid damage if its faulty.

NOTE: Don’t ever connect both connectors at once! 

You can use your amiga keyboard (using the ctrl-amiga-amiga combination) to switch on/off the ATX psu. This is the preferred method for ATX psu in A1000 case.

You can also use an ATX style wired tactile switch with a non-A1000 case. See LED/PWR_SW in the right hand side.

VGA output selector (J300-303)

Left = Scandoubler output (31KHz)

Right = Denise direct output (15KHz)

The scandoubler is the recommended usage as it compatible with all amiga software in modern monitors

Scandoubler clock setup (J700)

Must be connected to the left position to work properly

Internal audio (INT AUDIO – CN102)

Connect your sound card output here. Central pin is GND

External Drive swap (J252-J253)

Both jumpers horiz  = swap (external drive is DF0:, internal drive is DF1:)  

Both jumpers vertical = normal

Use the SWAP position to use an external drive or gotek-like drive as your boot drive

TOD CIA source (TOD – J251)

Right (NORM) – signal comes from Agnus

Left (PSU) – signal comes from PSU (only for working, original, A1000 psu. NOT ATX)

The right (NORM) option is standard for all amigas. If unsure leave this in the NORM position

Light Pen port selection (LPEN – J403)

Right – Lpen connected to port 0 (Mouse)

Left – Lpen connected to port 1 (Joystick)

If unsure leave this opened

Alternative Keyboard input (CN51)

Use this for a A500 keyboard or a keyboard adapter such as an usb-keyboard adapter.

Agnus LPEN pin rework (J404)

Can be connected (left) to LPEN to work. It is left open to allow most VBB agnus to work.

See (rework for rare agnus to work) 

If unsure leave this opened

VBB agnus (J406)

Close = VBB agnus mode

Open = Normal (Non-VBB) agnus mode

Use this jumper to match YOUR Agnus chip. VBB Agnus chips are marked “VBB” but you can check the version using the CBM part number too

Base clock setup (J405)

Must be connected to left side to work properly

Base clock selector (J500)

Must be connected to left side to work properly

ROM type selector (J200)

Right = use FLASH, 2x 32 pin chip sockets

Left = use standard A500/600/2000 kickstart chip socket

NOTE: Standard, single chip (A500/A600/A2000) kickstart may NOT detect on-board fast ram and/or the IDE controller. Specifically, 2.05 or highr version is needed for the IDE controller to be detected in the system.

If you can burn a custom kickstart image to a 40 Pin eprom, use an A1200 kickstart to achieve best results

Big ROM selector J201 (only for non-standard 1MByte images in ROM)

Right = Boot from high part of the ROM (higher image for dual-image mode)

Open = Boot from lower part of the ROM (lower image for dual-image mode) 

Left = Boot from lower, use full 1 Mbyte addressing (for single big rom image)

Floppy power CN1

Connect internal floppy power here

There an alternate 4 pin power connector in the board at CN3. Both connectors provide the same power and can be used the same

Small Addressing (J203)

Disable both on-board fast-ram and 32 bits addressing

You usually don’t need to use this jumper because the board disables the 32 bit addressing for motherboard resources when an accelerator board cpu takes over.

SDRAM clock (J451)

Must be soldered to left to work properly 

Internal Floppy Led Connection (J50)

Connect your case led here to show floppy activity

Power Led Connection (LED – J250)

Connect your case led here to show Power status

ATX Power Switch (PWR_SW – J1)

Connect an optional tactile switch to switch on/off the ATX power

Appendix A. A1100 TV Video Connector

TV video connector

Provides 15KHz output regardless of the scandoubler. It has additional pins to the original spec to provide higher quality YC output for retro equipment

A1000A1100ATARI 8 bit
1NCY (luma)Luma
3Audio – L Audio – LAudio
4CompositeCVBS (composite)Composite
5GNDC (chroma)Chroma
7+12V (for modulator)+12V
8Audio – RAudio – R 

I believe that both original cables and atari 800/XE cables should work but a carefully checked cable is a must. 

CAUTION: Keep signals away from 12V