Name the Display Terminals and Printers That Actually Shipped with Charactergenerator Roms
# Name the Display Terminals and Printers That Actually Shipped With Character-Generator ROMs
## 1. Place the Character-Generator ROM Inside a Real Product Category
Early alphanumeric video display terminals — the class of equipment that let a user type commands and read text output from a computer over a serial line, displacing teleprinters for interactive use through the 1970s — commonly built their text-display logic around a dedicated character-generator ROM supplying a fixed font, because generating glyph shapes by any other means (discrete logic gates wired per character, for instance) would have been far more hardware-expensive than one small ROM addressed as described in Step 8. Dot-matrix impact printers from the same era used the identical lookup principle to drive a print head: the character code selected a column-by-column hammer-firing pattern from a character-generator ROM instead of a glyph pixel for a screen, but the addressing idea — character code in, fixed dot pattern out — was the same mechanism applied to a mechanical output device instead of a video one.
## 2. Recognize the Shared Economics With Step 5's Mask Economics
Every terminal or printer model built around a fixed character-generator ROM inherited exactly the mask-design-and-fabrication economics from Steps 5–7: the font itself, being mask-fixed, could not be changed by field update, and adding a new character set or symbol genuinely meant a new mask set with its own design-and-fabrication lead time and its own respin risk if a glyph came out wrong. This is precisely why later display and printer designs eventually moved toward downloadable or EEPROM-based character sets for applications that needed font flexibility, a product-positioning shift directly analogous to the EPROM/EEPROM niche distinction already told in `eprom_eeprom_history_step08` and `step10`, named here rather than re-derived.
Step 10 turns to a second named application beyond the 4001: game-cartridge ROMs, and the commercial product category they actually created.