hours. If you are unsure, then click here to see examples. Odd behavior from IBM 5150 with CGA card/Display After I got my 5150 with an MDA card, and no display, I just wanted to see if it ran properly. I bought an IBM PC for something crazy like £900 with a CGA monitor back in the day. This used analog RGB signals, rather than four or six digital color signals as on previous CGA and EGA monitors. This is a very nice example of an original IBM 5150 PC system. So I started running it with a VGA display, and a 16-bit ISA backwards compatible card from the late '90s, which works just fine, but definitely wrong-era equipment to use with this machine. In fact, the same exact ROM chip is used for the MDA and CGA cards. All of the new PS/2 graphics systems (whether MCGA, VGA, 8514, or later XGA) used a 15-pin D-sub connector for video out. Vintage IBM 5150 Personal Computer PC CGA Card Boots w/original box. I have a CGA card so when I put that in and attached the CGA monitor (5153) it boots fine and I see display. That might tell you whether it's a problem with the card or whether the signal is outside the LCD televisions' range. VGA video connector. First I wanted to do some tests on the IBM 5150 with a Hercules card. IBM 5150 PC COMPUTER WITH KEYBOARD POWERS ON CHEAPEST PRICE RARE 515 2/21. The IBM Personal Computer (model 5150, commonly known as the IBM PC) is the first computer released in the IBM PC model line and the basis for the IBM PC compatible de facto standard. Here are … I'm trying to figure out how the IBM 5150 PC handled the case where multiple physical devices (memory chips) were mapped to the same address within the 8088's physical address space. Its been sitting in a box for nearly 25 years at least and ”... Read more. Pulled this monster out of storage for the first time in 3 & 1/2 years, and finally gave it a basic cleaning to remove the decades of cat hair, dust, and general funk that had built up in the case under the previous owner. There is the normal beep, the drives are lighting up etc. I'll have to try this out today. This drawing is a combination of the card specifications found within the IBM 5150 Technical Reference Manual, with additional references/changes to accommodate the Keystone 9202 mounting bracket that is commonly used in modern ISA designs. Released on August 12, 1981, it was created by a team of engineers and designers directed by Don Estridge in Boca Raton, Florida.. It seems to have sync issues when they're doing the crazy color stuff. Like this one, for example: All the screenshots up to this time were made using a VGA card, and here is the CGA: OK, everything is set up and works, system bootable floppy is at hand, a monitor with a composite input is ready, we can start the tests? The IBM CGA card has 16KB of RAM and an 8KB Character ROM (only 4KB used). All guides are very rare first editions except EasyWriter which is version 1.1. The CGA card that came with my 5150 has both TTL (the 9-pin monitor connector) and composite video outputs (the RCA jack), and I've used the composite output with one of my 13-inch CRT televisions successfully. Edit: Gave it a try. An IBM PC asks for a CGA or a Hercules card (no MDA, i want some graphics too). reenigne. Item Information. Before going into each part, let’s define what the target system was for the demo: A 1981 IBM 5150 (aka the very first “IBM PC”) with 640 KB RAM, a floppy drive, IBM CGA card, and internal speaker. Switch block SW1 Of SW1 and SW2, SW1 is the switch block closest to the center of the motherboard. The IBM 5150 does work fine. In the early part of 1980, IBM decided to create a microcomputer (up to this date, IBM produced only mini and mainframes). Hercules testing on the IBM 5150. Both an MDA and CGA card could work in the machine at the same time, driving two separate monitors. Time left: d. h. m. s. day. This is meant for vintage PCs. Stuffed a Hercules graphics card in and used a Hanterex green screen monitor with a long persistance phosphor, P39 maybe. Hardware Design. Popped a hard disk controller in and a 6Mbyte hard drive so now I've nearly got an XT. That isn’t surprising, since IBM built the PC to do just that. Details. This supported CGA graphics modes, VGA 320x200x256 and 640x480x2 mode, but not EGA or color 640x480.