USER PORT

User Port Extension Header

User Port Extension Header

Pin

Name

Description

Special Purpose

1

GND

Ground

2

+5V

+5 VDC (200 mA max)

3

/RESET

Reset, will force a Cold Start. Also a reset output for devices.

4

CNT1

Counter 1, from CIA #1

5

SP1

Serial Port 1, from CIA #1

6

CNT2

Counter 2, from CIA #2

7

SP2

Serial Port 2, from CIA #2

8

/PC2

Handshaking line, from CIA #2

9

ATN

Serial Attention

10

12VDC

12VDC (Max 500mA)

11

12VDC

12VDC (Max 500mA)

12

GND

Ground

13

USRCTL0

FPGA Pin, NOT 5V tolerant!

LED Clock

A

GND

Ground (RS232: GND)

B

/FLAG2

Flag 2 (RS232: RxD=Both B+C)

C

PB0

Data 0 (RS232: RxD=Both B+C)

D

PB1

Data 1 (RS232: RTS)

E

PB2

Data 2 (RS232: DTR)

F

PB3

Data 3 (RS232: RI)

H

PB4

Data 4 (RS232: DCD)

J

PB5

Data 5

K

PB6

Data 6 (RS232: CTS)

L

PB7

Data 7 (RS232: DSR)

M

PA2

PA2 (RS232: TxD)

N

GND

Ground (RS232: GND)

P

USRCTL1

FPGA Pin, NOT 5V tolerant!

LED Data

Applies to: Ultimate 64

Note that the row 1-12 corresponds to the upper row of the User Port card edge fingers on a C64, and that the row A-N corresponds to the bottom row of the User Port card edge fingers.

Pin 13 and P, the two left most pins on the header, are added for add features to the user port. One of the intended usages of these two pins is the generation of the “9 V~” on the user port extension board.

There is one other use of pin 13 and P, which is the control of a LED Strip. In this case, pin 13 the LED Clock and pin P is the LED Data, assuming a LED strip that is based on APA102C.

In the LED Strip configuration menu, the use of pind 13 and P can be chosen. When the LED Strip is set to ‘off’, the 9 V~ generation is enabled.

Attaching the User Port Adapter

The user port adapter accessory should be connected using a 26-pin ribbon cable. Note that there is only ONE correct way to connect it, and other ways may result in damage of the U64 itself or to the accessory.

Correct connection Ribbon Cable to the User Port Extension Header

Pay attention to the orientation!! The red wire should line up with pin 1!!!

Please make sure the connector is not shifted a whole row, or to the left or to the right:

Incorrect connection Ribbon Cable to the User Port Extension Header