Re: The A-Series, apparently introduced in 1983, appears to be compatible with the E-Series, F-Series, L-Series. (best viewed with non-proportional font) Memory Cycle T&M Catalog $ for Time (nanosecs) Year "system" A400 0.4 MIPS (or, 1 MIPS as of 1992 catalog) 12100A (board) 1990, 1993 2424A (boxed) 1990..1992 2434A (boxed) 1990..1992 2484B (?) 1990..1992 2134A (boxed) 1990..1992 A600 Model 6, 2186A/B 454 1983 Model 16, 2196A/B 454 1983 A600+ 0.4 MIPS 2106CK/DK (board) 1990..1992 2426G/H (boxed) 1990..1992 2436G/H (boxed) 1990..1992 2486B/C (board?) 1990..1992 2156C/D (boxed) 1990..1992 2196G/H (board?) 1990..1992 A700 Model 17, 2197A/B 500 1983 A900 1.3 MIPS (or, 3 MIPS as of 1992 catalog) 2439B (boxed) 1990..1993 2489B (board?) 1990..1993 2139B (boxed) 1990..1993 2199E (board?) 1990..1993 A990 3.2 MIPS (or, 7 MIPS as of 1992 catalog) 12990B/C (board) 1991..1993 2939A (boxed) 1991..1993 2989A (board) 1991..1993 2959A (boxed) 1991..1993 2999A (boxed) 1991..1993 E-Series Model 60, 2178A/B 665 1983 Model 40, 2176C/D 595 1980..1982 37,000 Model 20, 2174A/B 595 1980..1981 22,000 F-Series Model 65, 2179A/B 420 1983 Model 45, 2177C/D 350 1980..1982 43,500 Model 25, 2175A/B 350 1980..1981 27,500 L-Series Model 5, 2142A 680 1982 Model 10, 2146B 680 1981 22,500 M-Series 2105A 650 1980 2108M 650 1980, 1981 2112M 650 1980, 1981 All of the above run DS/1000 and IMAGE/1000 In many cases, you may see other model numbers (e.g., L-Series with 12030A, or 2103L ... both are in the "Ordering Information" in the 1981 catalog, but neither are in the table of HP 1000 systems on the prior page (which has only 2142A). Apparently, the rest of the universe slowed down after the 1991 catalog came out, because MIPS got faster in 1992 (IIRC, the floating point performance for the A-Series didn't change when the MIPS rating changed) The oldest Test & Measurement Catalog I have is 1980. I looked in 1980..1983, and 1990..1993 for the above data.