T-Rex II image (above left) used with permission from MyAmigaShop.com
T-Rex, T-Rex II (G-Force 040-40, A4060DT)
TekMagic 2060 (A2060) and 'cousins'
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Updates: Sept. 25, 2021
T-Rex II A4060DT boards were apparently still available for $445 as late as December 2010. At what point Michael at GVP-M stopped selling them is unknown; presumably around the same time as the last update was made to the website—June 27, 2011.
Jeff Boyer, Ralph Babel, and GVP / GVP-m
Jeff Boyer - According to his resume, worked for GVP from 1989 to 1998. Darren Eveland notes on comp.sys.amiga.misc (August 8, 2000) that he designed both the GVP-m '060 and QuikPak 68060 cards (the latter of which QuikPak licensed the board design from him).
The GVP-m A4060 accelerator card was indeed designed by Jeff Boyer, as Olaf Barthel explains:
"He designed the DMA controller Commodore would use in all SCSI/XT hardware up to and including the A3000. He also was Commodore's SCSI guru until he left to join GVP-m. Here again he was responsible for the data storage products and the accelerator cards. The GVP-m A4060 was his last feat, which draws upon the earlier 68040 designs he did for GVP-m."
Where is Jeff Boyer today? If his resume and/or LinkedIn info (additional link) is still current, he's owner and president of Tekmagic, Inc. in Glenmoore, Pennsylvania:
441 Highspire Rd
Glenmoore, PA 19343
Ralph Babel - Wrote the original GVP-m 68060.library for the TekMagic card in 1995, and the only modifications made to it by Jeff Boyer (which resulted in v2.2) were the patching of the copyright string and the commenting out of the NoBypass mask-bug workaround. In 2018, Ralph also updated the original GVP-m 68060.library file to v2.3 (the primary fix identifies the Rev. 5 68060's Load/Store Buffer Bypass bug, and disables the mode). QuikPak licensed Ralph's 68060.library from him for their 68060 accelerator cards.
GVP / GVP-m - (source: Amiga Hardware Database)