Note on Model I/III LDOS manuals

Corrected 10-16-98
Updated 12-2-98
Updated 1-4-99
Updated 9-3-02

Mark Fishman tells me that "at the end Roy did update and print brand-new complete manuals for the operating system(s) and BASIC(s) -- one manual covering both LDOS and LS-DOS, and one for both MI/III and M4 BASIC." I don't have copies of those manuals, but I hope to get them eventually. They should cover LDOS 5.3.1 and LS-DOS 6.3.1. If anyone reading this has a copy, please get in touch with me.

What I do have is as follows:

The 2nd Edition manual for Model III LDOS version 5.1.x. This manual was scanned, OCR'ed, and reformatted in MS Word by Pete Cervasio, so it is searchable and it looks great. Most of the information in this manual applies to both Model I and Model III, but Model I specific information is not included. See below for some information on the differences between Model I and III.
The 3rd Edition manual for Model I LDOS 5.1.x. This manual is scanned at 300 dpi, but is not OCRed, so it is a much larger download (6.7 MB) and is not searchable. Thanks to James Brusewitz for scanning this manual.
The Radio Shack edition manual for Model I/III LDOS 5.1.3R, the first version of LDOS that Radio Shack licensed as their hard disk operating system. This edition combines Model I and III information, but leaves out a few things Radio Shack didn't want in there, such as LX-80 information. This manual is scanned at 300 dpi and not OCRed. It weighs in at 7.7 MB. Thanks to James Brusewitz for scanning it.
The update booklet documenting the changes between 5.1 and 5.3.1, scanned, OCR'ed, and reformatted. This booklet covers both Model I and Model III.
Update pages highlighting the changes between 5.3.0 and 5.3.1, scanned, OCR'ed, and reformatted. The pages cover both Model I and Model III. Note that the previous item subsumes this one, but I've supplied both anyway.

Here are some differences between Model I and Model III LDOS, for those who would prefer to download only the searchable Model III manual but need Model I information too:

Model I LDOS included the FDUBL/CMD driver for double density support on machines with double density adaptors, and SOLE/CMD to support making bootable double density disks. See the online help.
A few system files are differently named, such as MOD1/DCT vs. MOD3/DCT (floppy drivers) and RS232R/DVR vs. RS232T/DVR (serial port drivers).
Model I LDOS has different RAM addresses for a few system functions and memory areas available to programmers. A summary of both Model I and Model III addresses follows. This data was scanned in from a paper copy of the LDOS Quarterly, volume 2 number 1, so it reflects LDOS version 5.1.3.
The LDOS way of checking for Model I vs. III is to test whether the byte at (125H) is 'I'; if so, it's a Model III. The 'I' is part of the ROM's "Model III Basic" signon message.

M E M O R Y    M A P  -  A L P H A B E T I C    L I S T I N G

This  memory map  section  is  provided to  allow quick  lookup  of  a  memory  address
corresponding to  an LDOS  system  label. An  asterisk marks those addresses which  are
different on the (Mod I) and [Mod III].

   @ABORT----(4030),[4030]      @PAUSE----(0060),[0060]      JFCB$-----(4358),[4265]*
   @ADTSK----(4410),[403D]*     @PEOF-----(4448),[4448]      JLDCB$----(43C0),[42C2]*
   @BKSP-----(4445),[4445]      @POSN-----(4442),[4442]      JRET$-----(430C),[4222]*
   @CKDRV----(44B8),[4209]*     @PRINT----(446A),[446A]      KFLAG$----(4423),[429F]*
   @CKEOF----(444B),[4458]*     @PRT------(003B),[003B]      KIDCB$----(4015),[4015]
   @CLOSE----(4428),[4428]      @PUT------(001B),[001B]      KIJCL$----(43BE),[42BE]*
   @CMD------(4400),[4296]*     @RAMDIR---(4396),[4290]*     KISV$-----(43B8),[42B8]*
   @CMNDI----(4405),[4299]*     @READ-----(4436),[4436]      LDRV$-----(4308),[4427]*
   @CTL------(0023),[0023]      @REW------(443F),[443F]      MFLAG$----(442F),[ N/A]*
   @DATE-----(4470),[3033]*     @RMTSK----(4413),[4040]*     MULTEA----(4B6C),[4B6B]*
   @DEBUG----(440D),[440D]      @RPTSK----(4416),[4043]*     OSVER$----(403E),[441F]*
   @DIV------(44C4),[4451]*     @RREAD----(4454),[445E]*     OVRLY$----(430E),[4414]*
   @DODIR----(4463),[4419]*     @RUN------(4433),[4433]      PDRV$-----(4309),[4423]*
   @DOKEY----(44BE),[4285]*     @RWRIT----(4457),[4461]*     PRDCB$----(4025),[4025]
   @DSP------(0033),[0033]      @SKIP-----(4460),[4464]*     PRSV$-----(43BC),[42BC]*
   @DSPLY----(4467),[4467]      @TIME-----(446D),[3036]*     RDSECT----(4777),[4777]
   @DVRHK----(4033),[4033]      @VER------(443C),[443C]      RDSSEC----(4B45),[4B45]
   @ERROR----(4409),[4409]      @WEOF-----(444E),[445B]*     RSELCT----(4759),[4759]
   @EXIT-----(402D),[402D]      @WHERE----(000B),[000B]      S1DCB$----(43D8),[42D4]*
   @FEXT-----(4473),[444B]*     @WRITE----(4439),[4439]      S2DCB$----(43E0),[42DA]*
   @FNAME----(44BB),[4293]*     CFCB$-----(4480),[4485]*     S3DCB$----(43E8),[42E4]*
   @FSPEC----(441C),[441C]      DATE$-----(4044),[421A]*     S4DCB$----(43F0),[42E6]*
   @GET------(0013),[0013]      DAY$------(4047),[4417]*     S5DCB$----(43F8),[ N/A]*
   @ICNFG----(4303),[421D]*     DBGSV$----(405D),[405D]      SBUFF$----(4200),[4300]*
   @INIT-----(4420),[4420]      DCT$------(4700),[4700]      SEEK------(475E),[475E]
   @KBD------(002B),[002B]      DCTBYT----(479C),[479C]      SELECT----(4754),[4754]
   @KEY------(0049),[0049]      DFLAG$----(441F),[4289]*     SFCB$-----(44A0),[42A1]*
   @KEYIN----(0040),[0040]      DRCYL-----(4B65),[4B64]*     SFLAG$----(430F),[442B]*
   @KILL-----(442C),[442C]      DIRRD-----(4B10),[4B10]      SIDCB$----(43C8),[42C8]*
   @KITSK----(4300),[4285]*     DIRWR-----(4B1F),[4B1F]      SODCB$----(43D0),[42CE]*
   @KLTSK----(4419),[4046]*     DIVEA-----(4B7B),[4B7A]*     SVDAT1$---(4306),[442F]*
   @LOAD-----(4430),[4430]      DODCB$----(401D),[401D]      SVDAT2$---(4307),[4457]*
   @LOC------(445A),[446D]*     DOSV$-----(43BA),[42BA]*     TCB$------(4500),[4500]
   @LOF------(445D),[4470]*     GETDCT----(478F),[478F]      TIME$-----(4041),[4217]*
   @LOGER----(447E),[428D]*     HIGH$-----(4049),[4411]*     TIMER$----(4040),[4288]*
   @LOGOT----(447B),[428A]*     INBUF$----(4318),[4225]*     USTOR$----(4DFE),[4DFE]
   @MSG------(4479),[4402]*     INTIM$----(404B),[4473]*     VERSEC----(4772),[4772]
   @MULT-----(44C1),[444E]*     INTMSK$---(404C),[4474]*     WRPROT----(4768),[4768]
   @OPEN-----(4424),[4424]      INTVC$----(404D),[4475]*     WRSECT----(4763),[4763]
   @PARAM----(4476),[4454]*     JDCB$-----(430A),[4220]*     WRTRK     (476D),[476D]