Hardware Description Manuals
For the serial connection you need a RS232 adapter, either the simple for 3 wire▿ handshake or the 9600 baud▿ RTS/CTS one. If you don't have an EPROM cartridge you may want to build▿ it yourself.
RS232 Adapter
This RS232 is suitable for 3 wire handshake only and works with line speeds up to 2400 baud. All you need are these parts:
- user port plug
- MAX232, MAX232A, or MAX202
- 5 capacitors, each 1 µF for MAX232 or 100 nF for MAX232A or MAX202
- A SUB-D plug, 9 pins, male
Connect all these things in the right way:
User port RS232 9pins 25pins
_________
| |
PA2 M-----------11-| |-14----------------- TXD (3) (2)
-10-| |--7-
-12-| MAX 232 |-13-
FLAG2 B---o--------9-| |--8----------------- RXD (2) (3)
PB0 C---' | |
| |
VCC 2------o----16-| |
| | |
+ | |--3--|+-,
--- | | |
| | |--1-----'
o----15-| |
| | |
o--|+-2-| |--5--|+-,
| | | |
o--+|-6-|_________|--4-----'
|
GND N------o-------------------------------------- GND (5) (7)
The RS-232 adapter now becomes connected to the host computer with a null modem cable. If you want to perform the RS232 adapter as a null modem cable itself, you can exchange the signals TXD for RXD. Instead of a male plug you need a female SUB-D plug then.
9600 Baud Interface
This is ↥Daniel Dallmann's 9600 baud interface. It works up to 9600 baud and supports RTS/CTS handshake. You need an additional 74LS00 with a 100 nF capacitor and a few connections more than for the simple interface.
User port RS232 9pins 25pins
VCC 2---o------14
| _|__ _________
| | | | |
PB1 D---+-o-1-| 74 |-3----10-| |--7--------- RTS (7) (4)
| '-2-| LS | | |
| | 00 |-5-, | |
PB6 K---+---6-| |-4-o--12-| MAX 232 |-13--------- CTS (8) (5)
| |____| | |
+ | | |
--- 7 | |
'-------o | |
| | |
PA2 M---o-------+---------11-| |-14--------- TXD (3) (2)
SP1 5---' | | |
| | |
FLAG2 B---o-------+----------9-| |--8--------- RXD (2) (3)
PB0 C---o | | |
SP2 7---' | | |
| | |
VCC 2-----------+----o----16-| |
| | | |
| + | |--3--|+-,
| --- | | |
| | | |--1-----'
| o----15-| |
CNT2 6---, | | | |
PB7 L---' | o--|+-2-| |--5--|+-,
| | | | |
| o--+|-6-|_________|--4-----'
| |
GND A/N---------o----o------------------------------ GND (5) (7)
The RS-232 adapter now becomes connected to the host computer with a null modem cable. If you want to perform the RS232 adapter as a null modem cable itself, you can exchange the signals TXD for RXD and RTS for CTS respectively. Instead of a male plug you need a female SUB-D plug then. This is a combinated version, which supports both, a direct null modem connection or a standard serial connection. And here is another version, pimped with LED indicating the signal line states. And finally, you can gaze at an LED-pimped interface having even a housing here.
EPROM cartridge
To connect a 2764 EPROM to the expansion port of the C64 there is no additional hardware needed. Just connect the device as follows:
Expansion port EPROM
============================
A0 Y -------- 10 A0
A1 X -------- 9 A1
A2 W -------- 8 A2
A3 V -------- 7 A3
A4 U -------- 6 A4
A5 T -------- 5 A5
A6 S -------- 4 A6
A7 R -------- 3 A7
A8 P -------- 25 A8
A9 N -------- 24 A9
A10 M -------- 21 A10
A11 L -------- 23 A11
A12 K -------- 2 A12
D0 21 -------- 11 D0
D1 20 -------- 12 D1
D2 19 -------- 13 D2
D3 18 -------- 15 D3
D4 17 -------- 16 D4
D5 16 -------- 17 D5
D6 15 -------- 18 D6
D7 14 -------- 19 D7
-ROML 11 -------- 20 -CE
Vcc
2 or 3 ----o--- 1 Vpp
o--- 28 Vcc
'--- 27 -PGM
GND A,Z, --o--o-- 14 GND
1 or 22 | |
| |
-EXROM 9 --o o-- 22 -OE
26 NC
The cartridge may look like this.
