13th October 2019. ZETA V2 with 8 inch floppy drive support!

12th October 2019. Yep! My ZETA V2 is running fine with my 8 inch NEC FD1165. It's really quite simple. I just needed a little bit to rebuild the new ROM (RomWBW) with the new floppy driver. Then just reburn/flash the ROM (GALEP-5) and that's it.


6th October 2019. RC2014: XMODEM works perfectly with 115.200 bps in combination with the RAM disk! (see Workaround part 3)

29th September 2019 / 22:08: Hooray! I didn't have time for pictures yet. My RC2014 works fine! There were problems only with the strange assignment of my FTDI-USB cable. I unplugged the connector and manually connected the lines to the dual serial board. It works!

Probably I set about 800 solder points and everything worked fine. I am speechless. I have never soldered before in my life!

27th September 2019. RC2014: Building my own Z80 Computer

25th September 2019. Hercules Graphics Card (GB101, GB102)

22nd September 2019. Setting up a hard disk with HDMAINT within CP/M-86 on an IBM XT 5160

9th September 2019. Using an external 5.25" floppy diskette drive with power supply through a DC37 connector/cable.

18th August 2019. Replacing the DOS-Format program: FDFORMAT

4th August 2019. 8 bit MFM NCL Controller: NDC-5027

30th July 2019. You need the ROM BIOS for the CompatiCard IV, version 1.05? Look here at downloads.

2nd June 2019. Since the page about my test systems was hopelessly outdated, here is the new edition.: My testsystems and floppy stations.

30th May 2019. MicroSolutions: Megamate 2.8 Floppy disk drive (3.5") with 2.88 MByte.

29th May 2019. My 386DX-AT with a CompatiCard IV is up and running with four floppy disk drives. A: - 8" (M2896), B: - 5.25"/360K, E: - 5.25"/1.2M, F: - 3.5"/2.88M (Megamate 2.8). The Copy II PC Option Board Deluxe is also connected between drives A: and B:.

28th May 2019. Update: Exploring the features of CompatiCard IV floppy disk controller.

26th May 2019. Hooray! The "Magic Five" are complete: Option Board Deluxe, CompatiCard I and IV, Kryoflux and Catweasel MK4 PCI.

25th May 2019. My Catweasel MK4 is up and running. Even with my 8 inch NEC FD1165. Tim Mann's software CW2DMK and DMK2CW works perfect.

23rd May 2019. Emulation of floppy disk formats: CP/M to DOS interchange

12th May 2019. Emulation of floppy disk formats: SuperCopy

11th May 2019. TEAC FD-55 Series: FD-55E

10th May 2019. Data recording - from 'Single Density' to 'High Density'

1st May 2019. HBASIC (Hercules Graphics Card): HBASIC

26th April 2019. TEAC FD-55 Series: FD-55A

24th April 2019. 8 inch floppy disks: Single sided, double sided, flippy disk

12th April 2019. TARBELL BASIC: Source code found on old 8 inch floppy disks (1978/79)

7th April 2019. MicroSolutions: UniDOS

5th April 2019. MicroSolutions: UniForm-PC

4th April 2019. The Three Musketeers: CompatiCard / UniForm / UniDOS

30th March 2019. Update: My CompatiCard PC (286 AT) / My CompatiCard works only with DOS 3.20 not with 3.30!

29th March 2019. 8 bit MFM Western Digital Controller: WD1002S-WX2

26th March 2019. Disk drive speed (RPM) How fast does my floppy spin?

23rd March 2019. An odd 5.25 inch floppy disk drive: BASF 6106 (Siemens)

9th March 2019. 8 bit MFM Western Digital Controller: WD1002S-WX2A

Furthermore I replaced the fan in the power supply for my IBM PC 5150 today. I wrestled with myself for a long time, but the old fan was so loud that I replaced it with a quiet one. What a heavenly silence now!

28th February 2019. Memory expansion card: KOUWELL KR-513A

24th February 2019. Hooray! The "Magic Four" are complete: Option Board Deluxe, CompatiCard I, Kryoflux and Catweasel MK4 PCI.

23th February 2019. CTT Munich, IT-803 / 8 bit MFM hard disk controller from Germany

21th February 2019. Links updated / Malcolm Macleod: Floppy Disk Imaging

8th February 2019. Information about the Mitsubishi M4854-342M / Jumper settings, manual

17th January 2019. TEAC FD-55F running under PC/MS-DOS? (2M-XBIOS)

16th January 2019. East meets West - DDR (GDR) DIP RAM in IBM PC (U2164D C15)


28th December 2018. How do I transfer files from a modern computer to an old computer?

27th December 2018. Memory expansion card: IBM 256KB MEMORY CARD

26th December 2018. Running CD-ROM via the parallel port

2nd December 2018. I have updated the page about my My CompatiCard PC (286 AT). Among other things I have also described the program UNIFORM in connection with the CompatiCard. Finally I "quickly" created an 8 inch system disk with MS-DOS 2.11 for the NEC APC! You won't believe it, but I can actually run some programs on my IBM compatible PC under MS-DOS 3.20!

7th November 2018. Running CP/M-86 on an IBM PC

7th November 2018. Today my new "old" Option Board Deluxe arrived. I also bought it for little money on eBay. The description said used, but while unpacking it I saw that this board has never been plugged into an ISA bus connector before. The gold contacts were absolutely flawless! A first test. The card works perfectly! The complete package consists of the option board, the original manual and the original diskette with Transcopy V5.18. I miss the words!

Quick test: The Option Board Deluxe is not compatible with the CompatiCard I. To be continued.

4th November 2018. How do I import an old Word 5.5 *.txt file into modern text processors (i.e. OpenOffice) and covert it into a *.pdf file?

31st October 2018 Short info on the fast: With my IBM 5150 board and the ROM cassette Basic I actually wrote a short basic program and was able to save it via the cassette connection on a cassette. Awesome!

20th October 2018. Part 3: My CompatiCard PC (286 AT)

17th Oktober 2018. Links updated

14th October 2018. Exploring the features of floppy disk controllers.

Suddenly there was a loud bang. The blown capacitor

6th October 2018. I bought a CompatiCard I on ebay for little money. Awesome! This card is really a versatile floppy disk controller. This controller supports 8 inch drives with the original 77 tracks under MS-DOS. No tricks are required.

10th July 2018. Kaypro: About revisions and versions of the Kaypro family.

16th June 2018. Kaypro 10: Installing a new CP/M Version (2.2H) with the help of eight reload or autoload disks. I will report in more detail soon.

A brief outline. The Don Maslin Archive lacks the 8th image disk (k10hald8.td0)! Have a look at the submit file RELOAD.SUB (USER 0: k10hald1.td0). I downloaded all 8 Teledisk images (*.td0) from: www.mrynet.com.

As far as I can tell, both 2.2H image reload versions (Don Maslin / mrynet) are the same. The second line of RELOAD.SUB says: "last modified 9-14-84 rwb".

2nd June 2018. The Kaypro 10 arrived. CP/M 2.2F, one hard disk 10 MByte and a floppy (390 KByte). Awesome!

25th May 2018. BASF 6106 / revision of the website

20th May 2018. The site retrocmp.de is now "secure": https://retrocmp.de

5th March 2018. BASF 6106 / revision of the website

3rd March 2018. www.retrocmp.de is online