Having done well in the calculator and Pong system markets, APF needed a system to compeat with the Atari VCS (2600). Like Bally and Mattel (Intellivision) they thought that a system that expanded into a full computer would be a sure winner.
Thus the APF MP 1000 was born, and a year later the IM-1 Imagination Machine computer expansion.
Released in 1979, The Imagination Machine qualifies as the First Hybrid game system-computer to make it to the market.
| CPU | Motorola 6800 @ .9MHz |
| Video chip | Motorola MC-6847 Video Display Generator |
| Text Modes | 32x16 with 2x2 'semi graphics' in 9 colours (8 +Black) |
| Displayable Chars. | 64 |
| Programable Chars. | None |
| Graphic Modes | 256x192 in 4 colours 128x192 in 8 colours * |
| Sprites | None |
| Sound | One voice 5 octaves |
| Controls | two non removable 8 direction joysticks with 12 key keypad and 1 fire button. |
| Ram | 1K |
| Rom | Built in game (4k?) Rocket Patrol |
| Ram | 8k expandable to 24k* |
| Rom | 14k |
| Keyboard | 53 Key full stroke with 'Repeat', 'Line Feed' and 'Here Is' |
| Media | 1500 baud tape and up to two 5.25 floppy drives 68K each. |
| Optional | Serial port 300-9600baud |
With the Keyboard attached the 1k in the MP 1000 effectively becomes video ram.
If you bought the machine on the power of the Demo, you were surely disappointed with the Basic manual. However once the secret of accessing the graphics modes is revealed, the system becomes quite enjoyable to use. Add to the the fact that you can inbed machine language into the basic, and save it as one chunk. It becomes quite powerful.
Demo.mpeg 77.8MBOr view the You-Tube version
APF uses the same Motorola MC-6847 VDG as the TRS-80 COCO, Dragon computer, and NEC TREK. But does so in a different way.
Like the NEC Trek, the APF doesn't use the SAM memory manager to drive the VDG. It uses it's own memory management system.
On the COCO, or any normal system a 256x192 graphic mode would need 6K of ram. (256/8 = 32bytes per line * 192 lines = 6144Bytes or 6K). However, the MP 1000 (The Brain and Only video ram for the IM-1) has only 1K of RAM available.
What APF does, is use the first half of that RAM (0-511) as a 32x12 character table. Much like the text mode. It then uses the other half (512-1023) as a character description table of 32, 8x16 highres or 4x16 colour characters.
This introduces some limitations, like not being able to display a full screen bitmaped image, but also makes it much simpler to manage game graphics.
Due to this set-up, APF Basic games use the High res. and Colour graphics quite easily.
Ram is usually added through the addition of a 'Building Block' expander plus an 8K cart. Giving a total of 16K (plus 1K in the MP 1000)
However, Our keyboard has a 3rd party internal expansion of 8K. Thus adding/enabling the 8K expansion cart gives us 24K
Unlike the Ram cart, the internal expansion doesn't have an On/Off switch. We have to POKE 41446,191 to return our keyboard to 8K
The BASIC programming language is provided through a cartridge.
Unfortunately, it had some short comings. Like needing to CALL a routine in the Game system to clear the screen, and a rather nasty habit of spectacularly crashing the system if you forget an ending bracket.
There is a 3rd party Expanded basic. It adds commands like CLS (CLear Screen), LEFT$, RIGHT$ and MID$. Plus a Ram manager (for adding ML programming to BASIC) if you hit the 'HERE IS' key.
More on the BASICs in the Programming section.
