Separate parsing from rendering to eliminate per-character GDI calls.
ProcessChar now only updates cell data in memory; rendering is deferred
to FlipToScreen which batches consecutive same-color cells into single
TextOut calls (~5-10 per row instead of 80). Partial BitBlt transfers
only the dirty row band to the screen. Non-blinking rows render to one
buffer and BitBlt to the second, halving GDI work for typical content.
Also removes redundant GetCommError from KPComm receive path and adds
BeginUpdate/EndUpdate batching in the test app's CommEvent handler.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Resolve GPFs in both USER.EXE and COMMTASK.DLL by correcting RETF
sizes for SETCOM and GETDCB, confirmed by disassembling CyberCom.DRV.
Add stock-compatible ComDEB structure so third-party code (ProComm
COMMTASK.DLL) can safely access internal fields at known offsets per
Microsoft KB Q101417.
COMM.DRV changes:
- SETCOM (ord 2): RETF 4, takes DCB FAR * only (not commId + DCB*)
- GETDCB (ord 15): RETF 2, takes commId, returns DCB FAR * in DX:AX
- Add 40-byte ComDebT matching stock COMM.DRV internal layout
(evtWord at +0, MSR shadow at +35, queue counts at +8/+18)
- cevt returns pointer to ComDebT for third-party compatibility
- Sync ComDEB fields in ISR dispatch, reccom, sndcom, cflush, setque
- Move WEP to ordinal 16, add ordinal 101 stub (match stock/CyberCom)
- Default DBG_ENABLED to 0 (set to 1 to re-enable debug logging)
VBX control fixes:
- Fix SETBREAK/CLRBREAK constants (use numeric 8/9, not undefined macros)
- Fix serialEnableNotify return type (BOOL, not int16_t)
- Fix mscomm.h to work with RC compiler (#ifndef RC_INVOKED)
- Fix vbapi.h USHORT typedef and MODEL.flWndStyle type
- Add vbapi.lib dependency to makefile
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
