In 1984, there is extensive evidence that Atari designed two CP/M Z80 cards for the 1090XL. One of these cards was a non-functional prototype and one may still exist. A schematic diagram exists of the other card. The discovered software appears to work with the card version for which only a schematic diagram remains. Either of these cards did not have their own memory and, instead, used memory from one of Atari's 64k 1090XL memory cards.

This card is a full-size updated version, in a classic styling, with 64k of on-board memory. It's function is based upon the schematic of the second card. Unlike many 1090XL cards, this card capitalizes on 4 programmable logic chips so as to reduce the chip count and add the 64k of on-board memory.

The pictures are as follows:

1. CP/M running on this card on a 1090XL with an optional 80 column RP board (not included).

2. The front side of the card described within this listing. (A Z-80 chip is shown installed and is optional.)

3. PlanetFall running.

4. MicroSoft BASIC running.

5. WordStar 3.0 running.

At this time, this card's CP/M OS customization and utilities are at the end of the beta stage of development.

The current state of the software is as follows:

• ADM-3a terminal emulation is fully supported.

• VT-52 terminal emulation is partially supported.

• The boot process works properly and CP/M executes.

• Printer support has been added.

• CP/M can be used to format floppy disks in Atari 1050 enhanced density format via a custom format.com utility.

• Double density disks are supported when the hardware supports double density disks. (i.e. Happy 1050)

• The system can be installed on floppy disks and the floppy disks can be copied from within CP/M.

• Other CP/M utilities function such as such as stat.com, pip.com, ddt.com, etc.

• WordStar 3.0 and SuperCalc run on this card.

• Infocom games such as Zork, Hitchhiker's Guide To The Galaxy, and Planetfall run on this card.

• Other CP/M programs, that run on a Z-80 or 8080, have been proven to run on this card.

• A boot/OS/utilities disk has been created and is available.

• Files can be copied from an Atari DOS 2 disk onto a CP/M disk.

• CP/M device re-direction has been added.

As the Z-80 CPU has been discontinued this card is available with or without the Z-80 CPU. Due to my minimal supply of Z-80 CPU's, I have them listed at a premium price point. This card requires the Z-80 CPU have a minimum speed of 8Mhz.

Shipping within the US will require a signature upon delivery.

Please allow several business days for shipment as these cards are made on an as-needed basis.

More information, source code, etc., can be found here: AtariAge Z-80 Thread