Commodore MAX Machine
| Commodore MAX Machine | |
 | |
| Type: | Home Computer |
| Producer: | Commodore |
| Price: | 149.95 US$, (498 DM, ca. 250 €) |
| Released: | 1982 |
| Discontinued: | 1982 |
| Processor: | MOS 6510 @ ca. 1 MHz |
| Memory: | 2.5 KByte |
| OS: | Only with cartridge Mini BASIC I or BASIC V2.0 |
| Info: | alias Ultimax (USA) or VC10 (Germany) |
The Commodore MAX Machine was released in 1982 as a cut down version of the C64 and was only sold in Japan for $179. The MAX Machine used the same architecture as the C64, but only had 2 kilobytes of RAM compared to the C64's 64K. About 50,000 units were produced. In Germany was it called VC-10, in the USA: Ultimax. Because of its limited capabilities, and the popularity of the more capable VIC-20, the MAX Machine was quickly discontinued.
Contents
Weak points[edit]
- Only two kilobytes of memory → the Commodore 64 has 64 kB
- A membrane keyboard instead of a full-travel keyboard
- No Serial Port → no disk drives or Printer
- No User Port
- No ROM-chips → no Operating System → a cartridge is necessary for functionality
- No cartridge included
- Access to the datasette is only possible with the "MAX BASIC"-cartridge. (Maximum program size is two kiloBytes)
BASIC[edit]
To use the Max Machine with an OS like BASIC you must plug in one of these two cartridges:
MINI BASIC I[edit]
The cartridge MINI BASIC I contains a cut down BASIC V2 with 510 free Bytes.
- The following commands are missing: ATN, CLOSE, CMD, COS, DEF, DIM, EXP, FN, INPUT#, LEFT$, LOAD, LOG, ON, OPEN, PRINT#, RIGHT$, SAVE, SIN, SQR, TAN, USR, VAL, VERIFY and WAIT.
MAX BASIC[edit]
The cartridge MAX BASIC contains the full BASIC V2 with 2047 free Bytes.
Construction[edit]
Interfaces[edit]
Most connections are on the rear (from left to right):
- Power on/off switch
- Power connection (7 pin) for the power supply (4 pin DIN)
- Audio connection (1/8" jack)
- Expansion Port (44 pin; I/O)
- Channel select (channel 1 or 2)
- RF out (RCA jack)
- Datasette connector (Cassette Port; 12 pin; I/O) for connecting a 1530 or C2N
There is a Control Port on both sides.
Mainboard[edit]
It was always built a Assy 325565 Rev.A or Rev.B board.
- Processor: MOS 6510 with ca. 1 MHz clock
- Memory: 2 KB RAM (M58725P) + 0,5 KB Color RAM
- Graphics: VIC-II (MOS 6566)
- Display in text mode (big letters/graphic symbols or big/small letters) 40 (columns) * 25 (rows) chars or in graphic mode (HiRes) 320*200 pixel in 16 colors, 16 frame colors and 16 background colors (additional 8 sprites (HiRes or Multicolor) in BASIC
- Sound: SID 6581
- Miscellaneous: One interface chip CIA (MOS 6526) for I/O (Input/Output), PLA 6703
- Operating System: None, must be supplied through cartridge ("MINI BASIC I" or "MAX-BASIC")
Specifications[edit]
- Dimension: Max machine: 350x185x60mm, Package: 445x330x140 mm
- Weight: 1820 g
- Keyboard: Membrane keyboard with 66 keys (QWERTY layout)
- Power supply: Sekundär: 5V DC and 9V AC
- Power consumption: 25W
Ultimax-mode[edit]
MAX Machine cartridges are compatible with the C64, since the C64 has a MAX Machine compatibility mode. Freezer cartridges for the C64 used this compatibility mode to write their ROM in the address section of the hardware interrupt vectors $FFFA to $FFFF (for normal C64 cartridges, these addresses are not accessible) and so they can freeze a program without crashing the CPU or modifying the RAM content.
Block diagram[edit]
Memory map[edit]
| Memory map (hex) | Memory map (decimal) | Standard configuration | Cartridge Mini Basic I | Cartridge Max Basic |
|---|---|---|---|---|
| $E000-$FFFF | 57344-65535 | - | 8KB Kernal/Basic/Char-ROM | 8KB Kernal/Char-ROM |
| $D000-$DFFF | 53248-57343 | I/O-area | I/O-area | I/O-area |
| $A000-$CFFF | 40960-53247 | - | - | - |
| $8000-$9FFF | 32768-40959 | - | - | 8KB Basic-ROM |
| $1000-$7FFF | 4096-32767 | - | - | - |
| $0800-$0FFF | 2048-4095 | - | - | 2KB RAM (on the cartridge) |
| $0400-$07FF | 1024-2047 | screen RAM | screen RAM | screen RAM |
| $0200-$03FF | 512-1023 | 0,5KB RAM | 0,5KB RAM | RAM (system area) |
| $0000-$01FF | 0-511 | RAM (zeropage, stack) | RAM (zeropage, stack) | RAM (zeropage, stack) |
Note: Green background means free basic-memory.
Ultimax cartridges[edit]
The Commodore MAX cartridges are mainly published in 1982 in Japan. They can be also used on the C64.
| Part No. | Name | ROM-size | ROM-chip | Description |
|---|---|---|---|---|
| 3101 | Mini BASIC I | 8KB | 901233-01 (Kernal+Basic+Char) | Application |
| 3102 | Max BASIC | 8KB 8KB 2KB |
901231-01 (Kernal+Char) 901230-01 (Basic) HM6116P-4 (RAM) |
Application |
| 3201 | Music Composer | 8KB | Application | |
| 3401 | Omega Race | 8KB | Game | |
| 3402 | Wizard of Wor | 8KB | Game | |
| 3403 | Kickman | 8KB | 325362-02 | Game |
| 3404 | Gorf | 16KB | Game | |
| 3501 | Avenger | 8KB | 325350-01 | Game |
| 3502 | Jupiter Lander | 8KB | 325351-01 | Game |
| 3503 | Super Alien | 8KB | Game | |
| 3504 | Radar Rat Race | 8KB | 325352-01 | Game |
| 3505 | Road Race | 8KB | Game | |
| 3508 | Mole Attack | 8KB | Game | |
| 3509 | Clowns | 8KB | 325356-01 | Game |
| 3510 | Money Wars | 8KB | 325357-01 | Game |
| 3511 | Bowling | 16KB | Game | |
| 3512 | Slalom | 16KB | Game | |
| 3xxx | Le Mans | 8KB | Game | |
| 3xxx | Billiards | 8KB | Game | |
| 3xxx | Music Machine | 4KB | Application | |
| 3xxx | Pinball Spectacular | 16KB | Game | |
| 3xxx | Sea Wolf | 8KB | Game | |
| 3xxx | Speed/Bingo Math | 8KB | Game / Learning software | |
| 3xxx | Visible Solar System | 8KB | Application |
MultiMAX Cartridge[edit]
MultiMAX [1] is a cartridge for the Commdore MAX Machine. This cartridge can also used in a C64 or C128! MultiMAX was present at "Vintage Computing Festival" in New Jersey in April 2014. The price of a complete cartridge is 29,95 USD [2] plus 4 USD for shipping (without uninsured ).
The PCB has a 1 MByte large EPROM-Chip (27C801), which contains all published games and applications for the Commodore MAX Machine. A 2 KByte large RAM-Chip (6116) is also installed, because it is needed for correct running "MAX BASIC". After installing and power on the computer appears a program menu. The cartridge has also a reset button.
 Multimax start screen. |
References[edit]
- ↑ MultiMAX Cartridge http://www.multimax.co
- ↑ MultiMAX selling price http://www.multimax.co/purchase/
Links[edit]
| Wikipedia: Commodore MAX Machine |
- MAX/Ultimax at Secret Weapons of Commodore
- Overview of Max Machine cartridges at c64preservation.com
- All about the MultiMAX Cartridge
