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Four player adapter edits #618

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Merged
avivace merged 2 commits into from
Aug 18, 2025
Merged

Four player adapter edits #618

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dfd2a89
Four Player Adapter: fix broken tables
bbbbbr Aug 18, 2025
b26597f
Four Player Adapter: fix typo
bbbbbr Aug 18, 2025
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6 changes: 5 additions & 1 deletion src/Four_Player_Adapter.md
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Original file line number Diff line number Diff line change
Expand Up @@ -54,6 +54,7 @@ a little more time than a single Game Boy video frame.
### Ping Packet Fields

The ping data received by each Game Boy looks like this:

Byte | Value | Description
-----|-------|-------------
1 | \$FE | PING HEADER
Expand All @@ -62,6 +63,7 @@ Byte | Value | Description
4 | ?? | STAT3

The chart below illustrates how Game Boys should respond to bytes in a ping packet:

Received From DMG-07 | Game Boy Reply
---------------------|-----------------------
PING HEADER (\$FE) | ACK1 = (\$88)
Expand Down Expand Up @@ -135,6 +137,7 @@ the Game Boys. Each byte is usually the same, however, sometimes the status can
change midway through a ping, typically on STAT2 or STAT3.

Each STAT byte has the following fields:

Bit | Name
----|------------------------
7 | Player 4 Connected
Expand All @@ -156,7 +159,8 @@ The upper-half of STAT1, STAT2, and STAT3 are updated based on the ping response
to show when Game Boys are "connected". If for whatever reason, the ping responses
are not sent, the status bits are unset.

Some examples of ping packets sent byte the DMG-07 are shown below:
Some examples of ping packets sent by the DMG-07 are shown below:

Packet | Description
--------------|-------------------------------------------------------
`FE 01 01 01` | Ping packet received by Player 1 with no other Game Boys connected.
Expand Down