1240

Manuals – Specifications – Links – Pictures

The Tektronix 1240 is a logic analyzer, introduced in 1984. The 1241 is the same device but with a color-shutter CRT, it was introduced in 1986.

Specifications

The 1240/1241 accommodate one to four acquisition boards of type 1240D1 with 9 channels or 1240D2 with 18 channels for a total of up to 72 acquisition channels. Acquisition speeds reach up to 100 MHz asynchronous or 50 MHz synchronous. The 1240/41 provides 14 levels of triggering with conditional branching.

There are two cartridge interfaces.

The rear slot is for I/O devices; three were produced. The 1200C01 is the RS232C Comm pack. The 1200C02 is the GPIB comm pack. The 1200C11 is the parallel printer comm pack. It required the 12RC01 Printer Support ROM pack.

The cartridge slot interface on the side of the instrument was memory specific and was for ROM and RAM packs. Both 8K and 64K RAM packs with battery backup were made, note that the battery is a potential HazMat made by Catalyst Research and may destroy the cartridge when it leaks. There were also ROM packs (12RMXX series) that allow for mnemonic disassembly and state analysis of most microprocessors of the time. The ROM packs were made with a generic PCB that had two socketed ROMs and jumpers to select the size.

See the Microprocessor support table for processor configuration options.

There is a design for a multipurpose RAM/ROM pack, called SuperPack by Pavel Korensky. Note the errata in the README file.

It uses either P6460 (general purpose) or P6462 (TTL) 9-channel probes.

Internals

The 1240 is built around an Intel 8088 as the control processor with 64K DRAM, and firmware in a bank of EPROMs.

A separate I/O processor board is powered by a Zilog Z-80A CPU. The display controller is built from individual TTL and ECL ICs.

The power supply is a switch-mode supply that mainly generates 5 V at up to 45 A. It requires a minimum load of 11.6 A. Additionally it generates 3 V at up to 8 A with no minimum load and several other voltages that are derived from linear post regulators.

Boards are two to six layers.

The CPU board has battery backed up RAM to save the current configuration and one user configuration. This battery is a lithium iodide cell. It will eventually fail and leak, damaging the PCB. The battery is visible on the picture for the A09 processor board.

See Also

• Time Stamp

Links

• Tektronix 1240 / 1241 / 1240D2 @ barrytech.com
• Video showing basic operation
• Video showing GPIB implementation
• Teardown of a 1241 nice pictures, but the site is in German.

Pictures

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  Tektronix 1240, front view

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  Rear panel (note second power switch)

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  Tektronix 1241 display

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  Tektronix 1241, front view

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  Tektronix 1241, rear view

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  Side with probe panel

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  1240 self test display

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  1240 state table view

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  1240 timing diagram view

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  6502 Disassembly

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  Tek 155-0270-00 probe data interface hybrid (one of three)

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  A06 CRT drive board (also includes comms pack interface)

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  A06 CRT drive board (rear side)

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  A07 Power supply

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  A07 Power supply (rear side)

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  A07 Power supply low voltage regulators

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  A08 Interface board

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  A08 Interface board (rear side)

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  A09 Control processor board

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  A09 Control processor board (rear side)

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  A10 I/O processor board

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  A10 I/O processor board (rear side)

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  A11 Display generator board

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  A11 Display generator board (rear side)

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  A14 Trigger board

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  A14 Trigger board (rear side)

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  A15 1240D1 9-channel board

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  A15 1240D1 9-channel board (rear side)

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  1240D2

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  1200C02 GPIB COMM PACK

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  ROM PACK

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  1241 State Table View

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  1240D1

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  1240D2

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Plugins

Some plug-ins / accessories compatible with 1240

Page	Manufacturer	Model	Description	Introduced	Discontinued
1200C01	Tektronix	1200C01	RS-232 Comm Pack (interface)	(?)	(?)
1200C02	Tektronix	1200C2	GPIB Comm Pack (interface)	(?)	(?)
1200C11	Tektronix	1200C11	Parallel Printer Comm Pack (interface)	(?)	(?)
1240D1	Tektronix	1240/D1	9-channel input card	(?)	(?)
1240D2	Tektronix	1240D2	18-channel input card	(?)	(?)
12R01	Tektronix	12R01	Performance Analysis ROM Pack	(?)	(?)
12RC01	Tektronix	1200C11	Printer Support ROM Pack	(?)	(?)
12RM01	Tektronix	12RM01	Disassembler ROM Pack (Intel 8080)	(?)	(?)
12RM02	Tektronix	12RM02	Disassembler ROM Pack (Intel 8085)	(?)	(?)
12RM03	Tektronix	12RM03	Disassembler ROM Pack (Intel 8086)	(?)	(?)
12RM04	Tektronix	12RM04	Disassembler ROM Pack (Intel 8088)	(?)	(?)
12RM05	Tektronix	12RM05	Disassembler ROM Pack (Intel 80186)	(?)	(?)
12RM06	Tektronix	12RM06	Disassembler ROM Pack (Intel 80188)	(?)	(?)
12RM08	Tektronix	12RM08	Disassembler ROM Pack (Intel 80286)	(?)	(?)
12RM21	Tektronix	12RM21	Disassembler ROM Pack (Motorola 6800)	(?)	(?)
12RM22	Tektronix	12RM22	Disassembler ROM Pack (Motorola 6802)	(?)	(?)
12RM23	Tektronix	12RM23	Disassembler ROM Pack (Motorola 6808)	(?)	(?)
12RM24	Tektronix	12RM24	Disassembler ROM Pack (Motorola 6809)	(?)	(?)
12RM25	Tektronix	12RM25	Disassembler ROM Pack (Motorola 68000)	(?)	(?)
12RM26	Tektronix	12RM26	Disassembler ROM Pack (Motorola 68008)	(?)	(?)
12RM27	Tektronix	12RM27	Disassembler ROM Pack (Motorola 68010)	(?)	(?)
12RM31	Tektronix	12RM31	Disassembler ROM Pack (Motorola 68020)	(?)	(?)
12RM33	Tektronix	12RM33	Disassembler ROM Pack (Motorola 68030)	(?)	(?)
12RM41	Tektronix	12RM41	Disassembler ROM Pack (Zilog Z-80)	(?)	(?)
12RM42	Tektronix	12RM42	Disassembler ROM Pack (Zilog Z8001)	(?)	(?)
12RM43	Tektronix	12RM43	Disassembler ROM Pack (Zilog Z8002)	(?)	(?)
12RM62A	Tektronix	12RM62A	Disassembler ROM Pack (Fairchild F9450)	(?)	(?)
12RM63	Tektronix	12RM63	Disassembler ROM Pack (MOS Technology 6502)	(?)	(?)
12RM71	Tektronix	12RM71	Disassembler ROM Pack (National Semiconductor NSC800)	(?)	(?)
12RM99	Tektronix	12RM99	Disassembler ROM Pack	(?)	(?)
12RS01	Tektronix	12RS01	8K RAM Pack	(?)	(?)
PM201	Tektronix	PM201	Intel 8086/8088 personality module	(?)	(?)
PM202	Tektronix	PM202	Intel 80186/80188 personality module	(?)	(?)
PM203	Tektronix	PM203	Motorola 68000/08/10 personality module	(?)	(?)
PM204	Tektronix	PM204	Intel 80286 personality module	1985	(?)
PM205	Tektronix	PM205	Motorola 68020 personality module	(?)	(?)