- #Sinclair zx spectrum dogboy serial#
- #Sinclair zx spectrum dogboy upgrade#
- #Sinclair zx spectrum dogboy professional#
To support the new BASIC commands, it came with twice the ROM size (32K) of the earlier models.
#Sinclair zx spectrum dogboy serial#
It also received new peripheral ports on the back (MIDI compatibility for the AY-3-8912, RS232 serial port, and an RGB/composite monitor port), plus an improved version of Sinclair BASIC. It also got a new 3-channel sound chip in the form of the Yamaha AY-3-8912, which can also be found in the Vectrex, MSX, Amstrad CPC range, and Atari ST/STFM. It could also be used as a RAM disk, so several programs could be stored in memory at the same time. The 128 machine boasted 128K of RAM, with this extra memory being 'paged' into the top 16K of memory when needed. Sadly this meant that they missed the important Christmas selling season for the new model. Sales of the 128 began in Spain in the second half of 1985, and in the UK half a year later, in January 1986 for a retail price of £179.95. Investrónica had previously helped Sinclair adapt their Spectrum+ for the Spanish market, where the government had imposed a special tax on home computers below 64K that did not support the Spanish alphabet and support messages in Spanish. This was because Sinclair still had a large number of unsold 48K units in its warehouse, and wanted to ensure sales of the new system wouldn't impede the sale of existing stock. Initially it was launched at the SIMO '85 trade show in Spain through Sinclair's Spanish distributor, Investrónica, not the home market of the UK.
#Sinclair zx spectrum dogboy upgrade#
In September 1985, the Spectrum line got a much needed upgrade with the release of the Spectrum 128. Over time, this could cause the connector to become loose and reset the computer inadvertently, so having a proper reset button was a big deal!įor existing Spectrum owners, the Spectrum+ keyboard could be purchased as a home-upgrade kit for £50. With the original spectrum no facility existed to power down or reset the machine, short of pulling the power connector out. It also had a much larger space bar and Enter key.Īnother positive addition was a reset button on the side of the casing.
#Sinclair zx spectrum dogboy professional#
This revised keyboard still used the underlying rubber membrane, but had more professional plastic key caps, not unlike those found on the Sinclair QL released the same year. Furthermore, issues with the original's keyboard were well known, and a number of manufacturers were successfully selling third-party keyboards as replacements for the Spectrum rubber keyboard - Sinclair wanted to compete with them.
Since the launch of the Spectrum it's looks had been somewhat revolutionary, but two years on it was looking small, insignificant, and dated. In October 1984, the Spectrum+ was released for £179.95 in order to address customer complaints over the rubber keyboard on the original Spectrum. Later, the 16K model's price was dropped to £99 and the 48K down to £129. Initially, in April 1982, there were two models available: The Spectrum 16K, available for £125 and the Spectrum 48K for £175, the only difference being the amount of RAM. Featuring colour and sound, and a lot more memory, it paved the way for home computer games as we know them today. In the UK, the ZX Spectrum was by far the most widely known home computer of the 1980s - sold in their millions, it was truly a major upgrade over the ZX81 it replaced. MIDI-out via Yamaha AY-3-8912 on Spectrum 128 andĬodenames: ZX-82 (Spectrum, Spectrum+), Derby (Spectrum +128K) MIDI-out, 2 x joystick ports, RS232 port, parallel port, 2nd disk drive portīuilt-in ROM: 16K (16K/48K/+), 32K (128), 64K (+2/+3)Ĭolours: 8 colours plus 8 flashing and 8 bright equivalents Ports: Ear/Mic (for tape playback/record respectively), Retired: December 1990 (Spectrum +3), 1992 (Spectrum +2B) Introduced April 1982 (16K and 48K versions)
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