Recent content by peterbbu

If you want to change CCP you can patch the CP/M 2.2 build system. The code extract will produce 2 columns on a 40 character screen and 4 columns on an 80 column screen. CCP QUERY 'Bias (0/100H)' ; patch for 2 dir columns 40 chars, 4 columns 80 chars. CCP_BLANK EQU CCP+0A2H ...

Just curious, why didn't you configure the DPB for the RAMdisk with 96 (95 in the table as it is directory size-1) and just use CP/M dir command on drive M: or what ever drive letter you assigned to the RAMDisk in the BIOS? Peter

Think of a Gotek with Flash Floppy as the equivallent of a physical drive. As with a physical drive there are a number of parameters that can be configured and a number of different types of drives. (3.5", 5.25", 8", 40 Track, 80 Track, or High Density, single or double sided) Different drive...

If you use Flash Floppy firmware on your GoTek, then you can use either HFE files which are flux change bitstream plus some meta data, this is largely agnostic to disk format or you can create an img.cfg file and use .img files, which are arrays of blocks. [However, please note that the 360 Kb...

Doug, Bear in mind that CP/M was originally written to run of a single sided, single density 8" disk (77x 26 x128bytes = 250 KB). 2 tracks were reserved for the os (2 x 26 x 128 bytes = 6.5 KB) of which 3.5 KB was allocated to BDOS, 2 KB for CCP leaving 1 KB for the BIOS. Around the time of...

Does anyone know where I can get a copy of EK-MXV-B2-UG B2 rom set user guide? I have the 2 page installation guide. and the MXV11-B user guide for the card. Thanks Peter

My KDF11 11/23 CPU M8186 has a broken 13.824 Mhz xtal oscillator (metal cased - fits DIL14) 4 pins used is faulty. I am having difficulty in locating a suitable replacement. I have found a 12 MHz and a 13 MHz part but not a 13.824 Mhz part. a) will it run ok, though slightly slower with either...

I have an RXV21 M8029 PCB: 5013080 C Sticky label: AB94473558 Plastic handle: 950 E There are no mod records marked so presume that this is REV E. What are the later changes needed to make the RXV21 work on Q22 micro pdp 11/73? I have read rev H supports Q22, What are the mods / changes to...

I have 2 systems: 1) Windows PC 2) Raspberry Pi 4B with Debian Bulleseye using either the LCD screen or an HDMI monitor and a terminal window to telnet or ssh to the system running simh. I am trying to run Teco/VT amongst other programs on SIMH none of the terminals are very successful other...

I have a Plessey 256KB QBUS memory card 705035 but am lacking any technical information on it. It is a dual card with 36 x 4864 DRAMs (64 K x 1) so 256 KB plus parity. There are 2 switches: S1 4pole all on S2 10 pole 1,6,7,8 off, 2-5 & 9-10 on Is this...

Wildfire, what is the device name for the HP DDS3? Thanks Peter

Many thanks all. I'll do some experimenting. Looks like I can either use the UC07 to emulat either an mscp disk controller or as a tmscp tape controller. Peter

Dave, The board is a little confusing. it is dual width not a quad module. it has multiple designations PCB silk screen says UC0710405-00 rev D Sticky label says: UC0710205-02 Rev K Main ICs say U2 Emulex 2400010 ESP100A U12 is Intel 80C31 U16...

Dave, I have pulled the card - it is Emulex UC07 10405-00 Rev D firmware is labelled G143R. It certainly works with SCSI disk drives and with CDROM. Peter

I would still need a good VT100 terminal emulation. Telnet from Unix still doesn't solve the terminal emulation problem. If I run a telnet session from Debian on the Pi it does not correctly display VT100 sequences on the kbd and screen, if I use a serially connected VT100 emulation / real...