diff --git a/docs/architecture.md b/docs/architecture.md
index 1c801a3..d73cbae 100644
--- a/docs/architecture.md
+++ b/docs/architecture.md
@@ -58,7 +58,7 @@ HAL writes straight to stdout.
 src/         — core interpreter (22 files)
 include/     — headers (14 files)
 platform/    — HAL backends (1 file)
-tests/       — 70 automated test programs, 4 classic interactive programs, compat harness
+tests/       — 71 automated test programs, 4 classic interactive programs, compat harness
 docs/        — Sphinx documentation
 ```
 
diff --git a/docs/development.md b/docs/development.md
index 3bf3556..6a81cc1 100644
--- a/docs/development.md
+++ b/docs/development.md
@@ -18,11 +18,11 @@
 | 0.12.0 | | BSAVE/BLOAD, TUI ANSI 16-color rendering, CGA graphics framebuffer PEEK/POKE, keyboard shift flags |
 | 0.13.0 | | VIEW/WINDOW/PALETTE graphics, PMAP function, MBF float format for CVS/CVD/MKS$/MKD$ |
 | 0.14.0 | | MBF binary file compatibility (IEEE↔MBF at save/load boundary), fix binary loader null-byte truncation, fix DRAW M/S/A bugs, add TA/=var;/X substring |
-| 0.15.0 | | Hardware I/O simulator: OUT/INP/WAIT/MOTOR statements, port emulation (8253 PIT, PPI speaker, CGA mode/color, COM1, game port), continuous tone via PulseAudio |
+| 0.15.0 | | Hardware I/O simulator: OUT/INP/WAIT/MOTOR statements, port emulation (8253 PIT, PPI speaker, CGA mode/color, COM1, game port), continuous tone via PulseAudio. Fill remaining gaps: RESET, ENVIRON/ENVIRON$, ERDEV/ERDEV$, IOCTL/IOCTL$, LCOPY, DATE$/TIME$ assignment, CALL, COM |
 
 ## Tests
 
-70 test programs in `tests/programs/`, plus 4 classic interactive programs in
+71 test programs in `tests/programs/`, plus 4 classic interactive programs in
 `tests/classic/` (Hamurabi, Lunar Lander, Gunner, Diamond from David Ahl's
 *BASIC Computer Games*).
 
@@ -32,7 +32,7 @@ Run the full automated suite:
 bash tests/run_tests.sh
 ```
 
-Each test has a 5-second timeout. 65 tests have `.expected` golden files
+Each test has a 5-second timeout. 66 tests have `.expected` golden files
 for output regression detection. Tests without golden comparison: datetime,
 on_timer, timer_stop (timing-dependent), color_test (visual), play_music
 (audio duration).
diff --git a/docs/index.md b/docs/index.md
index 1cfb5c3..e2b82be 100644
--- a/docs/index.md
+++ b/docs/index.md
@@ -27,7 +27,7 @@ version is structured as modular C suitable for new feature development.
 - **Printer output** — `LPRINT`/`LLIST` to file or real hardware via `--lpt`
 - **Classic programs** — Hamurabi, Lunar Lander, Gunner, and Diamond from
   David Ahl's *BASIC Computer Games* (1978) run out of the box
-- **70 test programs** with golden-file regression testing and DOSBox-X
+- **71 test programs** with golden-file regression testing and DOSBox-X
   compatibility testing against real GWBASIC.EXE
 - **MIT License**
 
diff --git a/docs/language-reference.md b/docs/language-reference.md
index d066981..ed463ac 100644
--- a/docs/language-reference.md
+++ b/docs/language-reference.md
@@ -54,13 +54,15 @@ type suffixes (`%`, `!`, `#`)
 | Event trapping | `ON TIMER(n) GOSUB`, `TIMER ON`/`OFF`/`STOP`, `ON KEY(n) GOSUB`, `KEY(n) ON`/`OFF`/`STOP` |
 | Error handling | `ON ERROR GOTO`, `RESUME`, `RESUME NEXT`, `RESUME n`, `ERROR`, `ERR`, `ERL` |
 | User functions | `DEF FN`, `RANDOMIZE` |
-| File management | `KILL`, `NAME`, `FILES`, `MKDIR`, `RMDIR`, `CHDIR`, `SHELL` |
-| Date/time | `DATE$`, `TIME$`, `TIMER` |
+| File management | `KILL`, `NAME`, `FILES`, `MKDIR`, `RMDIR`, `CHDIR`, `SHELL`, `RESET` |
+| Date/time | `DATE$`, `TIME$`, `TIMER` (read/write; `DATE$`/`TIME$` assignment accepted) |
+| Environment | `ENVIRON`, `ENVIRON$` |
 | Screen | `LOCATE`, `COLOR`, `WIDTH`, `SCREEN`, `KEY ON`/`OFF`/`LIST`, `KEY n,"string"` |
 | Graphics | `PSET`, `PRESET`, `LINE`, `CIRCLE`, `DRAW`, `PAINT`, `GET`, `PUT`, `VIEW`, `WINDOW`, `PALETTE`, `PMAP` |
 | Sound | `SOUND`, `BEEP`, `PLAY` (MML parser, PulseAudio backend) |
 | Memory | `DEF SEG`, `PEEK`, `POKE`, `BSAVE`, `BLOAD` |
 | Hardware I/O | `OUT`, `INP`, `WAIT`, `MOTOR`, `STICK`, `STRIG` |
+| Device stubs | `ERDEV`, `ERDEV$`, `IOCTL`, `IOCTL$`, `COM`, `LCOPY` |
 | Misc | `KEY`, `TRON`/`TROFF`, `OPTION BASE`, `MID$` assignment |
 | System | `SYSTEM` |
 
@@ -259,6 +261,45 @@ OUT &H61, INP(&H61) AND &HFC ' speaker off
 When the PPI speaker bits are set, the PIT frequency divisor is used to
 generate a continuous tone via PulseAudio (same backend as `SOUND` / `PLAY`).
 
+## Environment Variables
+
+- `ENVIRON "var=value"` — set an environment variable (uses the C `putenv()` call)
+- `ENVIRON$("var")` — read an environment variable (returns "" if not set)
+
+```
+ENVIRON "GREETING=Hello"
+PRINT ENVIRON$("GREETING")   ' prints: Hello
+PRINT ENVIRON$("PATH")       ' prints the system PATH
+```
+
+## Date/Time Assignment
+
+`DATE$` and `TIME$` can be assigned to set the date and time:
+
+```
+DATE$ = "01-15-2026"
+TIME$ = "14:30:00"
+```
+
+These assignments are accepted for compatibility but do not modify the
+system clock.  Reading `DATE$` and `TIME$` always returns the current
+system date and time.
+
+## Device Stubs
+
+The following device-related statements and functions are accepted for
+compatibility with programs that reference them, but return stub values
+since there is no real device hardware:
+
+- `ERDEV` — device error code (always 0)
+- `ERDEV$` — device error name (always "")
+- `IOCTL [#n,] string` — device control string output (accepted, ignored)
+- `IOCTL$(n)` — device control string input (always "")
+- `COM ON` / `COM OFF` / `COM STOP` — serial port event trapping (accepted, ignored)
+- `LCOPY [n]` — screen dump to printer (accepted, ignored)
+- `CALL` / `CALLS` — machine code execution (raises Illegal function call)
+- `RESET` — close all open files (equivalent to `CLOSE`)
+
 ## Sound
 
 - `SOUND frequency, duration` — play a tone (frequency in Hz, duration in clock ticks)
diff --git a/docs/roadmap.md b/docs/roadmap.md
index f23b2dc..f2b2d65 100644
--- a/docs/roadmap.md
+++ b/docs/roadmap.md
@@ -20,6 +20,11 @@ stub).  Default: reads return 0xFF (floating bus), writes discarded.
 
 Statements: `OUT`, `WAIT`, `MOTOR`.  Functions: `INP()`, `STICK()`, `STRIG()`.
 
+Also in v0.15.0: filled remaining statement/function gaps — `RESET`,
+`ENVIRON`/`ENVIRON$`, `ERDEV`/`ERDEV$`, `IOCTL`/`IOCTL$`, `LCOPY`,
+`DATE$`/`TIME$` assignment, `CALL`/`CALLS`, `COM`.  All 144 defined
+tokens are now handled (100% token coverage).
+
 ## Next Up
 
 *(Looking for the next major feature — see IDE and Notebook Integration below.)*
@@ -43,3 +48,7 @@ Statements: `OUT`, `WAIT`, `MOTOR`.  Functions: `INP()`, `STICK()`, `STRIG()`.
 - String garbage collection not implemented (uses `malloc`/`free` instead)
 - Maximum 256 variables, 64 arrays, 16 FOR nesting, 24 GOSUB nesting,
   16 WHILE nesting
+- `CALL`/`CALLS` (machine code execution) raises Illegal function call
+- `DATE$`/`TIME$` assignment accepted but does not modify the system clock
+- Device stubs (`ERDEV`, `IOCTL`, `COM`, `LCOPY`) return defaults — no real
+  device emulation