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7854: Difference between revisions
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The CPU in the 7854 is a [https://en.wikipedia.org/wiki/Texas_Instruments_TMS9900 Texas Instruments TMS9900 16-bit microprocessor], | The CPU in the 7854 is a [https://en.wikipedia.org/wiki/Texas_Instruments_TMS9900 Texas Instruments TMS9900 16-bit microprocessor], | ||
known from the infamous TI-99/4 home computer of the late 70s, with 32+6KByte ROM and 8KByte RAM. | known from the infamous TI-99/4 home computer of the late 70s, with 32+6KByte ROM and 8KByte RAM. | ||
The firmware consists of mask ROMs, an FPLA, and patch EPROMs. These ROMs (particularly the early ones from Mostek) are a common point-of-failure. Several remedies exist, [[7854rom|outlined here]]. | |||
==Software== | ==Software== | ||