There's a rather nice repository of Northstar Horizon CP/M stuff here (http://bitsavers.org/bits/NorthStar/NorthStar_Horizon/!northstar_horizon_disk_images.html).
Naturally it won't all work on the 128, but as it was Z80 equipped most of the binaries will be compatible.
Listing :
D01B01 "CP/M RELEASE 2.2 1.2.0 DQH 013658"
D02B01 "CP/M RELEASE 2.2 1.2.0 DQH 014254 FOR 15MB WIN"
D03B01 "CP/M RELEASE 2.2 1.2.0 DQH 013860"
D04B01 "HDOS 2.2.0 H SYSTEM DISK"
D05B01 "HDOS 2.0.0 H SYSTEM DISK"
D06B01 "HDOS 2.1.0 H SYSTEM DISK"
D07B01 "HDOS 2.2.1 H INITIAL RECOVERY DISK"
D08B01 "HDOS 2.0.0 H INITIAL RECOVERY DISK"
D09B01 "HDOS 2.1.0 H INITIAL RECOVERY DISK"
D10B01 "TSS/C INSTALLATION DISK 1.1.0 H 301792"
D11B01 "TSS/C CP/M UTILITIES DISK 1.1.0 H"
D12B01 "TSS/A START-UP DISK 2.1.1 H"
D13B01 "TSS/A UPDATE DISK 2.1.1 H"
D14B01 "TSS/A UTILITIES DISK 1 OF 2 2.1.1 H"
D15B01 "TSS/A UTILITIES DISK 2 OF 2 2.1.1 H"
D16B01 "TSS/A PASSWORD DISK 2.1.1 H"
D01B02 "DOS/BASIC 2.1.1 QG SYSTEM DISK (SUPERCEDES DOS 5.2)"
D02B02 "DOS/BASIC 2.1.1 QG SYSTEM DISK (SUPERCEDES DOS 5.2)"
D03B02 "DOS/BASIC 2.1.1 QG SYSTEM DISK (SUPERCEDES DOS 5.2)"
D04B02 "NORTH STAR REL 5 DOUBLE DENSITY BITSTREAMER II SYSTEM DISKETTE"
D05B02 "FORTRAN-80 1.0.0.*DQH"
D06B02 "APPLICATION SOFTWARE UTILITIES 1.1.0 DQ TRANSFER UTILITIES HORIZON VERSION"
D07B02 "MICRO 80, MACRO 80, SER 39138 VER 3.44, FORMAT NS"
D08B02 "DBASE II 2.35 1.0.0 *QH"
D09B02 "MICROPLAN 1.1.0 *QH 001934"
D10B02 "MICROPRO WORDSTAR 3.0 1.0.0 *DQH WORDSTAR 3.0 XG7995TZ"
D11B02 "MICROPRO WORDSTAR 3.0 WH6454S1"
D12B02 "MICROPRO SPELLSTAR 1.2 1.0.0 *DQH SPELLSTAR 1.21 S26396BE"
D01B03 "MIKE BERNSONS SMALL 'C'"
D02B03 "WORDSTAR (INSTALLED)"
D03B03 "MBASIC V5.2"
D04B03 "DOS/BASIC 2.1.1 DQ"
D05B03 "BACKUP MICROMOTION FORTH 79 FLOATING POINT PACKAGE NORTHSTAR CPM"
D06B03 "MICROMOTION FORTH 79 NORTHSTAR - CPM"
D07B03 "MICROMOTION FORTH 79 FLOATING POINT PACKAGE"
D08B03 "MICROMOTION FORTH 79"
D09B03 "PASCAL Z"
D10B03 "SAVE DISK - SUPERCALC"
D11B03 "DISK FROM CRAY CMOS 1.1 UTILITIES"
R0 "TINY"
R1 "CP/M PDS"
R2 "COMSTAR"
R3 "ALL GAMES BACKUP 1"
R4 "ALL GAMES BACKUP 2"
R5 "FORMATMW CM5619 [ON JACKET]"
R6 "WORKING CP/M C"
R7 "DEFENDER EPROMS"
R8 "PDS CP/M"
101DISK "WORKING DOS BACKUP"
102DISK "COPY OF ORIGINAL CPM 2.011 (UNCONF)"
103DISK "GRAPHICS BACKUP"
104DISK "BIOS BACKUP"
105DISK "WORDSTAR + DOCUMENT FILES, BOOT"
106DISK "FORTRAN, CBASIC-2, MBASIC, MAC, NO BOOT"
107DISK "CONFIGURED CPM 2.2 BACKUP"
108DISK "PICTURES (N-DOS)"
109DISK "BDS 'C' COMPILER, VERSION 1.42 (COPY) S/N 0425 – VOL 2/2"
110DISK "BDS 'C' COMPILER, VERSION 1.42 (COPY) S/N 0425 – VOL 1/2"
111DISK "BDS C COMPILER, VOL 2/2"
112DISK "BDS C COMPILER, VOL 1/2"
113DISK "PASCAL/Z FOR CP/M, VOL 1/4"
114DISK "PASCAL/Z FOR CP/M, VOL 2/4"
115DISK "PASCAL/Z FOR CP/M, VOL 3/4"
116DISK "PASCAL/Z FOR CP/M, VOL 4/4"
117DISK "FORTRAN, CBASIC-2, MBASIC, MAC, NO BOOT"
118DISK "ADA COMPILER, ORIGINAL, QUAD"
119DISK "AZTEC C COMPILER"
120DISK "ADA COMPILER, WORKING DISK, QUAD"
010DISK "AUTOLOAD DOS & BASIC, DOC – WORD PROCESSOR NORTHSTAR IN 5/20/85"
011DISK "ARTICLE, SYNC BUSTER PRIME DISK 3/19/87"
012DISK "WORD PROCESSOR FILES, ARTICLE – RBG MONITOR, NORTHSTAR IN 8/20/85"
013DISK "AUTOLOAD DOS & BASIC, REPORT, PEMBROOK, NORTHSTAR IN 3/26/84"
014DISK "START 6/18/85, REPORT FILES #34"
015DISK "WORD PROCESSOR FILES, ARTICLES – RBG MONITOR, NORTHSTAR IN 5/20/85"
016DISK "DOS & BASIC AUTOLOAD & UTILITIES, STORE, PRINT, PRINT1, PRINT2, NORTHSTAR, IN 4/25/85, USE 3/12/85. USE 5/17/85"
017DISK "VIDEO GAMES FILES, VIRGINIA, FUN-PUTT, IN 4/29/84, USE 5/17/85"
018DISK "DOS & BASIC AUTOLOAD & UTILITIES, STORE, PRINT, PRINT1, PRINT2, NORTHSTAR, IN 3/27/84"
019DISK "VIDEO GAME FILES – 3/12/85, IN 4/24/84"
020DISK "BAUDOT RTTY, IN 4/24/84"
021DISK "DOS & BASIC AUTOLOAD W/CF, INVOICE & BID, IN 3/26/84"
022DISK "VIDEO GAMES – FILE 6/1/84, NORTHSTAR, IN 4/24/84"
023DISK "VIDEO GAME FILES INCLUDING MASTER, NORTHSTAR, IN 3/27/84"
024DISK "AUTOLOAD DOS & BASIC, BILLING SERVICE, NORTHSTAR, IN 6/23/84"
025DISK "CHART OF ACCOUNTS – GENERAL LEDGER WITH DOS, BASIC, CF DD, IN 4/24/84"
026DISK "AUTOLOAD DOS & MODEM 3/30/84, NONWORKING DOS – SD?, NORTHSTAR, IN 3/26/84"
027DISK "WORD PROCESSING, MIKE, BACKUP 6/23/84"
028DISK "AUTOLOAD DOS & BASIC, LOAD MENU NORTHSTAR, PRIME BACK-UP, 3/24/84"
029DISK "FULL 6/18/85, START18, REPORT FILES"
030DISK "PRIME MASTER BACKUP, IN 3/28/84"
031DISK "AUTOLOAD DOS & MODEM, CF, M2D00, MODEM 0100, NORTHSTAR, IN 6/23/84"
032DISK "MRP DEMO, JOBS DRIVE #1, SINGLE DENSITY"
033DISK "MRP DEMO, FILES DRIVE #2, SINGLE DENSE"
034DISK "WP FILE, JOHN LETTER, MDEM1, 6/20/85"
035DISK "AUTOLOAD DOS & BASIC, DOC – WORD PROCESSOR, NORTHSTAR, 6/25/84"
036DISK "MRP DEMO – FILES DRIVE #2, IN 8/30/84"
037DISK "REPORT FILES, DRIVE #2, FULL, IN 3/27/84"
038DISK "DOS & BASIC & CF, MRP DEMO – JOBS DRIVE #1, IN 8/30/84"
039DISK "FILES FOR BILLING SERVICE, NORTHSTAR, 3/24/84"
040DISK "PRIME MASTER, BACK UP, SYSTEM START UP, DD"
041DISK "AUTOLOAD DOS & BASIC, LOAD 'CHECK', NORTHSTAR, IN 4/29/84"
042DISK "AUTOLOAD DOS & BASIC & CF, 'LOAD CHECK', NORTHSTAR, IN 4/29/84"
043DISK "LIBRARY – CLIPPER DD 4/27/84, IN 3/27/84"
044DISK "AUTOLOAD DOS & BASIC PRINTER, 'FILL 8206, 128', 'FILL 8206, 176', LOAD MENU, BILLING SERVICE NORTHSTAR, IN 3/21/84"
045DISK "DOC, WORD PROCESSOR, MASTER, SER #998, DD"
046DISK "ASSEMBLER – PLAY, IN 3/26/84"
047DISK "ASSEMBLER, HOMEBREW, MASTER MIKES DOS, BASIC, MONITOR – M2A00"
048DISK "DOS, BASIC, DAZZ D800, TIC TAC, 11/4/83"
049DISK "SYNCBUSTER COPY 1, IN 4/12/87"
050DISK "NSUG #7, GAME PACK, N*TREK, MEMSET 40959"
051DISK "NSUG #10, GAME PACK, ED, SCH2222, ENTER 0 IF NO CHANGE"
052DISK "NSUG #11"
053DISK "NSUG #12"
054DISK "NSUG #13, BANNER 2, COPY-DOC, (SINGLE DRIVE)"
055DISK "NSUG #14, GAME PACK, (MEMSET 40959)"
056DISK "NSUG #15"
057DISK "NSUG #16, STORM"
058DISK "NSUG #17"
059DISK "NSUG #18, GAME PACK"
060DISK "NSSE #1, GAME PACK, STARTREK MEMSET 40959, HOMEBREW NORTHSTAR 57343"
061DISK "NSSE #2"
062DISK "NSSE #3, GUESS, GAME PACK"
063DISK "NSSE #4"
064DISK "NSSE #5, GAUSS, LF PILOT 2A00"
065DISK "NSSE #6"
066DISK "NSSE #7, GAME PACK"
067DISK "NSSE #8, GAME PACK"
068DISK "NSSE #9, GOOD DISASSEMBLER, DASM"
069DISK "NSSE #10, FINANCIAL"
070DISK "NSSE #11, GAME PACK"
071DISK "NSSE #12"
072DISK "NSSE #13, GAME PACK"
073DISK "GENERAL LEDGER, SINGLE DENSITY"
074DISK "AUTOLOAD DOS & BASIC, GENERAL LEDGER – CHART OF ACCOUNTS, HOMEBREW, IN 4/29/84"
075DISK "PHONE BOOK (A) 7/22/83"
076DISK "DICK'S INVOICE, XMAS LETTER, FUN & PIZZA (GYRUSS) (A), CHARLIE'S ESTIMATES (LOAD 'JOB')"
077DISK "SYSTEM MASTER DISK, SYSTEM START UP, *SPARE*"
078DISK "HORIZON, SYSTEM DISK, VERSION 5.1DQ, 2034"
079DISK "CP/M 2.011, 48K SYSTEM"
080DISK "NORTHSTAR DOS & BASIC, SERIAL IN FLASHWRITER I"
Nice collection! Back in the day, I frequented a CP/M-80 oriented BBS in my area with a huge file archive, without which I wouldn't have had any CP/M programs other than what Commodore provided. Nearly anything that wasn't system-specific worked just fine on the 128. I wonder if the sysop still has all those files somewhere...
Can't remember his name at the moment, but I think I may have an old BBS guide around here somewhere. Since those days, I've never come across such a large archive. I wish I still had all the stuff I downloaded.
Didn't spend a ton of time in CP/M mode, but for a while it had my only C & Pascal compilers.