Side-by-side content & accuracy comparison — generated May 2026
| Category | ▲ Wikipedia | ▲ Grokipedia |
|---|---|---|
| Protocol origin date | 1986, Telenet contract. No specific public domain release date given. | more specific April 13, 1987 cited as public domain release date — sourced from Forsberg’s own documentation. |
| Session initiation | Mentions auto-start via sender triggering transfer. No frame-level detail. | much deeper Full handshake: ZRQINIT → ZRINIT, ZCHALLENGE/ZACK, 10s retransmit timer, 40s fallback to YMODEM. |
| Frame structure | Not covered. Mentions streaming and NAK-only design. | only source 6-byte header, ZF0–ZF3 flags, ZBIN/ZDATA/ZEOF/ZFIN frame types, 32-bit CRC per subpacket, “OO” termination sequence. |
| ZFILE subpacket fields | Not mentioned. | only source Null-terminated pathname, 32-bit decimal length, octal mtime (Unix epoch), file mode bits, serial number. |
| ZDLE escape mechanism | Mentions “control character quoting” generically. | deeper Specifies ZDLE = ASCII 030 (CAN), XOR 0x40 inversion, exact bytes escaped: ^Z, ^Q, XON, XOFF, ZDLE itself. |
| ZMODEM-90 | adequate MobyTurbo (~15% gain), 7-bit network support, run-length encoding. Accurate but brief. |
more detail Adaptive RLE, up to 20% gain on compressible data, variable-length headers, backward compat negotiation flags. |
| SEXYZ / Synchronet | good Correctly notes SEXYZ, long filename support, SyncTERM integration, open-source cross-platform. |
more detail Adds UTF-8/Unicode handling, ZMODEM-8k block support, telnet-based application context. |
| DSZ / GSZ | Lists DSZ, GSZ, lrzsz as notable implementations. No detail. | more detail Covers scripting, batch file integration, Doorway mode support, Windows 3.x GUI for GSZ. |
| ZedZap variant | accurate 8KB blocks for high-speed modems. ADONTEC 32KB/64KB extensions noted. |
more detail Same facts plus backward compat notes, Windows/Linux targets, ActiveX/DLL/OCX component support. |
| LeechZmodem | “Cheated BBS download quotas.” One sentence. | more detail Explains mechanism: manipulating ACK signals to simulate incomplete transfers; notes detection and blocking by sysops. |
| 4GB file limit | Mentioned as a known limitation. No technical explanation. | technical Root cause: 32-bit unsigned int offsets in ZRPOS/ZDATA/ZEOF/ZACK header fields (ZP0–ZP3). |
| Performance figures | conservative General comparisons to XMODEM/YMODEM. Latency math explained qualitatively. More trustworthy. |
specific 113 cps at 1200 baud vs 85 cps (YMODEM-k). Error rate math (0.75s/burst, 9% at 10&sup5;). Verify independently. |
| SSH / telnet escape issue | only source Notes ~ character problem with SSH escape sequences. Advises ssh -e none user@host. |
Not specifically mentioned. |
| BBS adoption context | good Covers BBS history, why ZMODEM replaced XMODEM, general timeline. |
more specific ~60,000 US BBS systems by 1992, Telebit TrailBlazer and US Robotics Courier modem context, decline to ~10,000 by 1997. |
| Modern implementations | Not covered beyond lrzsz mention. | only source Lists mbzm (embedded), zmodem.js (JavaScript), NuttX RTOS integration for IoT/serial as of 2025. |
| Overhead analysis | Not covered. | only source Header overhead <1% for large files, up to 50% worst-case with full escaping on small payloads. Fixed 5-byte binary header breakdown. |
| Source transparency | stronger Community-edited, public revision history, talk pages visible. Conservative claims reduce misinformation risk. |
“Fact-checked by Grok.” References listed but AI-generated content — precise figures harder to independently verify. |