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This allows the TI Speech Synthesizer's audio to be carried through the console to the monitor. The PEB also carries an analog sound input on the expansion bus. Each card has on-board regulators for its own requirements, thus reducing power consumption on a partially loaded PEB and allowing for future expansion cards which might have unusual voltage requirements. As on the earlier S-100 bus, the section of the power supply that power the card slots is unregulated. Each card also has its own "access light", an LED which would blink or flicker when the card was being used by software. Encased in silver plastic but made from sheet steel, these plug into the bulky "Peripheral Expansion System" (usually known among TI owners as the Peripheral Expansion Box or "PEB"), an eight slot chassis, containing its own linear power supply and a full-height 5¼" floppy bay. This original idea was soon replaced by a system based on expansion cards. The "sidecar" expansion units can be connected together in a continuing chain, but can rapidly occupy an entire desktop and cause crashes and lockups due to the large numbers of connectors on the system bus. The TI-99/4's original expansion concept was that peripherals would be connected serially to the console and each other, in a " daisy-chain" fashion.
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TI-99/4 'PEB' or Peripheral Expansion Box
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For example, Alpiner 's speech includes male and female voices and can be quite sarcastic when the player made a bad move. In many games (mostly those produced by TI), the speech synthesizer has relatively realistic voices.
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However, the success of software text-to-speech in the Terminal Emulator II cartridge cancelled that plan. The original intent was to release small cartridges that plugged directly into the synthesizer unit, which would increase the device's built in vocabulary. The synthesizer uses a variant of linear predictive coding and has a small in-built vocabulary.
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Speech synthesizers were offered free with the purchase of a number of cartridges and were used by many TI-written video games (notable titles offered with speech during this promotion were Alpiner and Parsec). In the early 1980s, TI was known as a pioneer in speech synthesis, and a highly popular plug-in speech synthesizer module was available for the TI-99/4 and 4A. The TI-99/4A did ship with an RF modulator. Federal Communications Commission in time. The TI-99/4 was sold with both the computer and a monitor (a modified 13" Zenith color TV) as Texas Instruments could not get its RF modulator approved by the U.S.
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This area gets very hot so users commonly refer to it as the " coffee cup warmer." The external power supply, which was different according to the country of sale, is a step-down transformer.Īvailable peripherals included a 5¼" floppy disk drive and controller, an RS-232 card comprising two serial ports and one parallel port, a P-code card for Pascal support, a thermal printer, an acoustic coupler, a tape drive using standard audio cassettes as media, and a 32 KB memory expansion card. The power regulator board is housed below and in front of the cartridge slot under the sloped area to the right of the keyboard. The TI-99/4A's CPU, motherboard, and ROM cartridge ("Solid State Software") slot are built into a single console, along with the keyboard. 1.1 First personal computer with a 16-bit processor.