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The Atari Lynx supports cartridge sizes of 129K, 256K, 512K and 1Mb (bank switched). The Lynx cannot address data on the cartridge directly and instead uses two counters to read data. The first counter is for the block number (0 - 255), the second counter is for the position within the block (0 - 4095, depending on cartridge size). Your code must know the exact block size used on a cartridge to be able to read data from it.
Related pages:
Physical Characteristics🕸
Pin pitch: 1.59mm
Pinout Diagram🕸
Below is the pinout for a typical Atari Lynx Cartridge.
Pins and Functions🕸
1 — GND 13 — A3 25 — A132 — D3 14 — A6 26 — A12
3 — D2 15 — A4 27 — SWCON/WE
4 — D4 16 — A5 28 — A8
5 — D1 17 — A0 29 — A9
6 — D5 18 — A7 30 — A10
7 — D0 19 — A16 31 — Vcc
8 — D6 20 — A17 32 — AUDIOIN digital I/O for 1M cards
9 — D7 21 — A18 33 — Vcc
10 — CARD/OE 22 — A19 34 — SWVCC
11 — A1 23 — A15
12 — A2 24 — A14
Additional Information🕸
Pins A12 - A19 are connected to the 74HC164 to select the block.
Pins A0 - A10 are connected to the 4040 to select the position within the block.
Pin A11 is missing.
The Card/OE pin is strobed on reads.
The Swcon/WE pin is strobed on writes.
See more Atari Lynx Programming Resources here and the following related pages:
Original information retrieved from RetroIsle.
Battery and SWVCC🕸
SWVCC is an unregulated 5V supply as compared to VCC. This can be taken advantage of to measure the voltage level in the battery if a custom cart was made. The voltage on SWVCC would be Vbatt-5V-0.6V. Note that even when the Lynx is off, there is a small voltage present on both SWVCC and VCC pins at the cart connector.
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