Exactly. I came here to say that. The amazing thing is Lancaster wrote that book before there was a pc of any kind to hook up to. But he showed very clearly how to generate NTSC monochrome video with a bucket of TTL chips. Such good times and good memories. SWTPC sold a kit of that TV Typewriter that I built. Not only Apple and SWTPC but Sol and mo doubt others basically cloned Lancaster’s design.