Gradiente Expert
From Wikipedia, the free encyclopedia
 | |
| Also known as | Expert XP-800 |
|---|---|
| Manufacturer | Gradiente Eletrônica |
| Type | home computer |
| Released | December 1985 |
| Discontinued | 1990 |
| Operating system | MSX BASIC, MSX-DOS, CP/M |
| CPU | Zilog Z80A @ 3.58 MHz |
| Memory | 64 KB–4096 KB (max.) |
| Removable storage | Cassette tape, cartridges, floppy discs |
| Graphics | TMS9918 |
| Sound | AY-3-8910 |
| Backward compatibility | MSX |
| Successor | Expert GPC-1 |
The Expert (or Expert XP-800), made by Gradiente Eletrônica (to date best known as a game console and Hi-Fi equipment company) was the second and last MSX home computer launched in the Brazilian market, in the mid-1980s.[1]
It was presented to the public at the 5th International Computing Fair, nicknamed "Informatica '85".[2] The event took place at Anhembi Convention Center in the city of São Paulo from September 23 to 29, 1985.[3] At the announcement, the computer was priced 65 ORTN s.[4]
Its market release date was 1 December 1985, one week after Epcom's Hotbit, just in time for 1985's Christmas and with a massive media campaign on magazines, newspapers and TV. In the newspapers ads the initial offer price was Cr$ 4,640,000, or US$470 by the value at the time,[5] or US$1,390 by Q2 2025.
The machine was a clone of the National CF-3000, with a computer case resembling a stereo system, a detached keyboard with a proprietary connector, no caps lock LED and no reset key,[1] although the soft-reset could be achieved by pressing simultaneously the keys Shift + Control + Delete, while a hard-reset could be achieved by pushing in either of the cartridge slot covers, if they were free.[6][7]
The Expert XP-800 was followed by the Expert GPC-1 ("Gradiente Personal Computer") in 1987, and by Expert Plus and Expert DD Plus (a system with a built-in 720 KB 31⁄2" floppy disk drive) in 1989.[8]
The Expert users waited for an MSX2 machine, but Gradiente never produced it[8] and discontinued the MSX line in 1990.
The two first versions had a graphite case and socketed chips, which caused a chronic problem: when the machine heated, the chips frequently pulled out and the system "froze". Also, the GPC-1, released in 1987, had a ROM slightly modified to solve an ASCII table compatibility issue with the other popular Brazilian MSX, Sharp's Hotbit.
Versions Plus/DD Plus
The last two versions had a black case and the problematic socketed chips were replaced by an ASIC. Nevertheless, the RAM was mapped to a secondary slot and, although it was straight by the MSX standards, caused a lot of crashes with programs who searched for memory in the wrong place. It did not contribute for the popularity of any of the Plus versions.[8]
These machines used the MSX-Engine T7937A instead of the Z80A CPU of previous models.