問題：
What are the available features on the old TDS500 and TDS700 scopes?
答案：
| Model | Date/F. W. Ver/SN | Features added |
TDS540 TDS520 | 6/1/91, v1.0 | Introduction. 500 MHz, 15 k record, 50 k option, 250 MS/s/channel sample rate; state, pattern, width, glitch, runt triggering. |
TDS540 TDS520 | 4/6/92, v2.0, | Cursor improvement; Area, cycle, and phase auto measurements; measurement gating and snapshot, EPS hardcopy, TekSecure, Pass/fail test, delay-by-events-then-time, TIFF hardcopy, Intensified samples, single-shot button, trig. level bars. |
TDS540 TDS520 | 6/1/92, v2.0, | Option 2F introduction, FFT. Option 13 printer interface introduction (RS232 and Centronics ports). |
| TDS544A | 3/15/93, | Color Display, floppy disk drive, video trigger option, FastFrame, math averaging and template testing, Fit-to-Screenrecord length waveform viewing, VGA output, printer interfaces standard. |
| TDS544A | 4/25/93 | FFT standard |
| TDS524A | 7/12/93 | Introduction |
TDS540A TDS520A | 7/12/93 | video trigger option, FastFrame, math averaging and template testing, Fit-to-Screen record length waveform viewing, Monochrome VGA output, clock/calender, Options available: Floppy disk, video trigger. |
TDS544A TDS540A | 5/2/94, B012170 5/2/94, B010670 | Standard record length increased to 50 k. |
| TDS744 | 6/15/94 | Introduction. ReplacedTDS544A. 500 MS/s/channel, max 1 GS/s on 1 channel, option 1M = 130 k/ch, 1 ns peak detect, Slew rate, Set-up-and-hold trigger, 400 Hz power supply. |
TDS744A TDS784A | 11/1/94 | InstaVu, 500 k record length on one channel with option 1M, 1 GHz bandwidth and 4 GS/s sample rate on TDS784A, with 1 GS/s on each channel. |
TDS520A TDS524A | 5/29/95 | 50 k record length per channel standard. |
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