Found in 2 comments on Hacker News
nickt · 2023-06-21
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It also reminds me of a similar option, the Jupiter Ace [1] which ran FORTH natively. The co-founders worked on the speccy and certainly borrowed some design aspects from the ZX81 (had a better keyboard though - ha!)
The manual was great for its time, a little dated now but still a decent read [2]. It was reprinted in 2018 and still available [3].
[1] https://en.wikipedia.org/wiki/Jupiter_Ace
[2] https://archive.org/details/vickers_steven_jupiter_ace_4000_...
[3] https://www.amazon.com/Jupiter-ACE-Manual-Anniversary-Progra...
The manual was great for its time, a little dated now but still a decent read [2]. It was reprinted in 2018 and still available [3].
[1] https://en.wikipedia.org/wiki/Jupiter_Ace
[2] https://archive.org/details/vickers_steven_jupiter_ace_4000_...
[3] https://www.amazon.com/Jupiter-ACE-Manual-Anniversary-Progra...
[0] https://news.ycombinator.com/item?id=36416325