也可以买一块与主板的BIOS芯片兼容的ROM芯片，如 27CXXX、 28CXXX系列 EPROM，用专门的可写 EPROM的仪器将正常的BIOS写入，换下升级失败了的BTOS芯片。

But there are simpler ways to generate patterns, including an old-fashioned EPROM, as [DrMattRegan] points out in a recent video. Generating video signals is an exercise in periodicity.

After cleanup, everything worked fine — except that the PSU’s 5 V became 6.5 V during the accident, and the EPROM with LocalTalk interface firmware died, connection between VCC and GND ...