Data General ALGOL Notes
		========================

Fixes
-----
	- MOVSTR now correctly updates string size
	  (MOVES.WH[SR])
	- ERROR routine now creates correct string specifier
	  (ERROR.WH[SR])

Enhancements
------------
	- added SYSTEM procedure (compatible with DG/L)
	- added XCT1 procedure (compatible with DG/L)


Comments and Notes
------------------
	- Compiler accepts /* ... */ as comment in addition to COMMENT
	  statement;
	- input characters masked to 7 bits;
	- source input lines terminated with <CR> and <FF>;
	- source input <TAB> [<011>] are expanded;
	- DG CHAIN procedure error handling is bad
	- FATAL or RT IO error not Eclipse or MV compatible(?)
	- ALGOL compiler source code characters have even parity in some
	  places which confuses ASM or MAC assembler
	  (old RDOS stripped parity, RDOS > ~7.1 kept parity!)
	- DG 2.08 is 2.10 octal, DG set it in wrong radix
	- ALGOLWH.LB created with ERROR, MOVESTR, SYSTEM and XCT1 updates


Maintenance Notes
-----------------
	- SYSTEM.WH   [SR] created
	- XCT1.WH     [SR] created
	- MOVES.WH    [SR] created
		main string variable current size not properly updated
		MOVES.SR
		USGT should be USGE
	- ERROR.WH    [SR] created
		bad parameter specifier for string (2 vs 3 word)
	- SYSTEST.WH  [AL] created
	- XCT1TEST.WH [AL] created


Possible projects
-----------------
	- DG/L-harmony (RDOS)
		GCHANNEL [ ( ERROR_LABEL ) ]
		GCINPUT  [ ( ERROR_LABEL ) ]
		GCOUTPUT [ ( ERROR_LABEL ) ]
		XCT2( INSTRUCTIONR8P2, AC0, AC1, AC2, AC3, CARRY [, SKIP_LABEL] )
		ARGCOUNT()
		ERETURN( ERROR_NUMBER [, ERROR_LABEL ] )
		SYSRETURN [ ( ERROR_LABEL ) ]
		READCHAR  [ ( ERROR_LABEL ) ]
		GETCHAR   [ ( ERROR_LABEL ) ]
		PUTCHAR( character [, ERROR_LABEL ] )
		OEBL
		ODIS
	- determine side-effects (if any) of ANOP definition in ALGOL code
		Eclipse: 100010 (octal)
		MV:      100011 (octal)
	- Multi-tasking (woohoo!)
	- save/trace compiler intermediate file, separate tree-walker program
	- ALGOL port to MP/OS, MP/AOS, AOS, AOS/VS[II] (RDOS syscall translator?)


2023-Feb-05


2023-Mar-04

	7-bit strip
	reconstruct official release
	save intermediate files (i.e. /I global switch for <filename>.<$1,$$>)
	multi-level include
	post-optimization options
	RTL fixes
	RTL additions
	N/E compiler differences, H/SMPYD 
	N/E RTL differences, H/SMPYD, LDB/STB
	dynamic N/E determination,
	hardware FPU
	Eclipse instruction use for performance (i.e. CLM, BLM, etc.)
	Extended ASM versus MAC use
	DG/L-style ECL instruction emulation for Nova
	update RTL routine name/summary
	automatic overlay calls
	consistent numbering scheme
	Position: common compiler/runtime for all DG OSes
		single source, simple, 
	line terminator: <CR> versus <LF>, <FF>[?]


	Patch # 1:

	Preserve ALG.$1 and ALG.$$ temporary files:
	(make ALGOL.SV command line option?)

	AL2.SV
		445 + 464/ 6017  403
		445 + 471/ 6017  403


	Patch # 2:

	Execute AL1.SV and/or AL2.SV with debug address.

	

Possible ALGOL Roadmap

	- establish DG product baseline from DG master tapes
		. compiler
			. 8-bit strip
			. N/E compiler differences
		. RTL
			. 2.11 update incorporated?
			. N/E RTL differences
		. releases
			. compiler official release
			. RTL official releases
			. date/time stamp harmony
	- product continuation
		. dev/maint environment
		. fixes
			. compiler (any known problems?)
			. RTL
				. separate WH .LIB
				. fix 'master' sources
		. enhancements
			. WH routines (XCT1, SYS, etc.)
		. deployment