Recent content by z80eu

I own a Mac IIci and I was able after a long time of "no use", to start into Mac OS 7. A starting "Apple" sound was not produced. I switched the computer off (by a menu entry), and after that, I tried to restart the computer again. But the Mac IIci generates now repeating switch on switch off...

Because I have some trouble with getting color from an Apple II+ (with an inserted PAL Encoder card) with my Commodore 1084 monitor (CVBS aka Composite), I am desperately looking for a schematic/diagram of that "PAL Encoder" card. Any suggestion where to find it (e.g. I didn't found it at...

I am out of ideas. I tried already to replace some typical faulty TTL chips on the Disk Controller itself (74LS174, 74LS132, 74LS259) and on the analog board of the drive (74LS125). The Apple II+ itself is working (showing the prompt, typing in some BASIC statements working, beeps on powerup)...

Hi, I read the blog entry http://www.vintage-computer.com/vcforum/entry.php?330-Cloning-a-PAL-HAL-Part-13 which includes at the end a zipped JEDEC file for a Trantor T130(B). Because my Eprom Programmer do not understand the JEDEC file, I tried to alter the structure a bit to make it...

Trying to use a WD8013EBT and XENIX 2.3.4 with TCPIP package, but I was unsure what h/w configuration would be suitable for the network card itself. This card has really a lot of jumper, and for me not all of them have a self explanatory imprinted labeling. There is a jumper with a label "W0B"...

Trying to go on writing my expiriences with Xenix at my blog ( http://www.z80.eu/blog ), I discovered a problem with my german keyboard layout. I am using a MF-II compatible keyboard (Extended Keyboard, Chicony 5312, No Windows Key but already an AltGr key) with german key layout. Using 'z' and...

Hi, because my target 486 machine does only have a 3.5" floppy drive, I was a bit curious about writing a 1.2MB XENIX floppy disk image to a (real) 3.5" floppy disk media. Is this possible (I know, number of sectors for DOS floppy disks is different, but this is NOT DOS) ? I would like to boot...

Hi all, short question(s), hopefully not difficult to answer. I would like to let run XENIX-86 and MS-DOS on my 5160. Are there any 8088 compatible boot manager existing to have it coexistent (booting one of two from the harddisk) ? And btw. does anybody tried to install XENIX-86 with a SCSI...

I was quite surprised how difficult it is to set a serial port (COM1, the used I/O card has a working 16550 UART) to a baud rate of more than 9600 baud - all done with an original IBM PC/XT. I figured out that the BIOS itself (NOT the used DOS 5.0) prevents to set more than 9600 baud (at least...

Help wanted... don't know the meaning of the DIP switches and Jumper of an 8-Bit ISA card labeled Acer PB85026-2L (which is also selled at Ebay as "Multitech"). See picture, my PC/XT only recognizes the parallel port, but not the two serial interfaces :-( Any hints related to/about the DIP...

Just for the records... at http://www.minuszerodegrees.net/rom/rom.htm a BIOS version 3.3 for the Seagate ST-01/ST-02 is offered. Meanwhile I was able to identify even a newer version at http://r3tr0.de/mirror/ftp.mpoli.fi/hardware/ROM/SEAGATE/index.html (...

Need a bit advice.... have exchanged the original empty drive frame with a 3.5" floppy drive. Before that, I had to remove a metal sheet (see picture). Now I have to fix this metal sheet back to its original place. But I do not know how ... any suggestions (I have to fix the whole drive frame...

Does someone have any infos about a "Seagate SL-02" SCSI Controller (8 Bit ISA card) I would really appreciate it if someone can post some more info about a "Seagate SL-02" SCSI Controller (made around 1990). Perhaps it is a "successor" card of a ST-02, but Google does not give me *any* hint...