IMSAI 8080 EMULATOR PRO 10 HAS

Emulation of an IMSAI 8080 with 2D frontpanel model currently running IMSAI 8K BASIC. Emulation of an IMSAI 8080 with 3D frontpanel model.

Imsai 8080 Emulator Pro 10 Has

C'mon, I work in I.T., this is old hat for me.CRT Technology was the dominant form of display from the dawn of computer and video games up until the mid-late 1st decade of the 21st century when HD LCD Televisions took over popularity, as did wider than 4:3 aespect ratio 'square' monitors. The front panel of the Kaypro 10 has a 9 inch green, monochrome, anti-glare CRT display which is 80 columns by 24 rows in text mode and 160 x 100 in graphics mode. The display is recessed which reduces the risk of screen glare.

Here we have the CRT display device, they are big for the size of picture you get, bulky, heavy, and consume a LOT of electricity compared to their LCD counterparts. Why on earth, especially in 2021 or later, would anyone want to have something like this in their home? Well, that's the focus of this document, not to make a choice for you, but rather to outline the pros, cons, and what you need to know before taking the plunge on an old CRT based monitor or TV set for retro-gaming. This 3D model is fully functional as described in the. Imsaisim - Emulation of an IMSAI 8080 system with 8080 or Z80 CPU, 64KB RAM, Cromemco Dazzler graphics, IMSAI FIF disk controller with four 8 SD disk drives.Nostalgia Miscellanious YouTube Links E-mail AN INTRODUCTION TO CRT'S IN THE REALM OF GAMINGThe CRT, or Cathode Ray Tube, are those old, larger screens used for computers and watching TV from about year 2005 on back. They are large, heavy, consume lots of electricity, but they also have visual character.

I also discovered that my drive controller was set up a bit differently than the default Tarbell settings. I needed to change the ports and RDA/TBE values to correspond to my hardware. The BIOS assumed a console output using the MITS 88-2SIO at ports 10h/11h. These required minor changes initially and provided a reasonable base for generating subsequent CP/M disks.I started by editing the system tracks of the disk images, then writing the images to physical media using my disk imaging workstation. AВ number of websites have archived CP/M distributions with the single density Tarbell controller custom BIOS (CBIOS.ASM) and boot (CBOOT.ASM) files.

Hand dump of PROM on Tarbell using the front panel showed that mine was set up to use ports starting at E8, a configuration that was available from Tarbell for the Processor Tech Sol 20, which had an I/O conflict at F8вЂ”I think for the video controller. Basically, the bootstrap is executed from the PROM and is supposed to load the first sector of the disk. The controller has a small 82S123 PROM for anВ initial bootstrap loaderВ that starts at $0000 on a machine reset.

The d isks were acting up. I thought it was the 3P+S. But then something happenedвЂ”a bus conflict? The serial port was dead. A few months later, the computer was working fine.

Bit 2 (4) is coming on in the first 1K and staying on. I took out the Tarbell controller. I entered the simple serial loader and transferred the monitor to 1C00. I verified that the 3P+S was working. No disk booted on either controller (I was also testing a ThinkerToys Disk Jockey at the time), although the head would load. Disk activity became erratic.

My biggest mystery: Running CP/M 1.4 (2-15-78) using the Tarbell single density controller BIOS, I had persistent PIP failures when copying files from drive A to B, and sometimes back. MEMORY was the problem! Again! It's curious thatВ sometimes memoryВ fails or is marginal under CP/M but otherwise worksВ through the front panel or a simpler monitor. Both disk controllers were up and running again. U4 is the first row (top) chip 3 from the left. Which chip? I switched out U4 with a replacement and that took care of the problem.

Using ASM to compile a file like 'ASM format.abb' resulted in garbage in the files written to drive B. Was it software or hardware?В And it wasn't just PIP. At first I thought it was reading the the wrong sector (or wrong track) when it started.

If it acts up again, I'll check whether the J1 pins on the logic board have cracked solder joints. I re-patched the J1 connections, and this seems to have solved the problem. Well, drive B started acting up (repeated head load / unload when trying to write or read), but jiggling the J1 jumper would often get it to work. My first repair job on J1 was probably sub-par, but the fact that the wires were cut may have also indicated another problem. Drive B was pretty glitchy. I hadn't grasped the meaning of this setting earlier, but as a result the drives weren't using their appropriate entries in the disk track tableвЂ”they were 'sharing' the same entry, which led to track verification errors.

Maybe I'll even migrate to CP/M 2.2. I might eventually get it running with the Z-80 board as an alternate configuration of the machine. I spent some time getting it running, but it was a lot slower than the Tarbell 1011A, so I gave up on the idea for now.

Imsai 8080 Emulator Mac