Model T Serial Cable - Revision history

Bkw: /* Summary */

2024-08-17T13:20:02Z

Summary

← Older revision		Revision as of 13:20, 17 August 2024
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	{\| class="wikitable" style="text-align: center; margin: auto;"		{\| class="wikitable" style="text-align: center; margin: auto;"
	\|-		\|-
	!colspan="4"\|looking at cable end!!rowspan="0"\|[[File:RS-232-Null-Modem-Cable-DE9F-to-DB25M.jpg]]		<!-- !colspan="4"\|looking at cable end!!rowspan="0"\|[[File:RS-232-Null-Modem-Cable-DE9F-to-DB25M.jpg]] -->
			!colspan="4"\|looking at cable end!!rowspan="0"\|[[File:DE9F DB25M.jpg\|400px]]
	\|-		\|-
	!colspan="2"\|female<br>[[File:Conn_dsub9f.gif]]!!colspan="2"\|male<br>[[File:Conn_dsub25m.gif]]		!colspan="2"\|female<br>[[File:Conn_dsub9f.gif]]!!colspan="2"\|male<br>[[File:Conn_dsub25m.gif]]

Bkw: /* USB */

2022-04-19T09:40:29Z

USB

← Older revision		Revision as of 09:40, 19 April 2022
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	*[https://www.amazon.com/dp/B0762BSKGC/ Tera Grande USB2-RS232WN-03] (FTDI)		*[https://www.amazon.com/dp/B0762BSKGC/ Tera Grande USB2-RS232WN-03] (FTDI)
	*[https://www.amazon.com/dp/B01DT6K8G2/ Gearmo GM-FTDI2-LED] (FTDI)		*[https://www.amazon.com/dp/B01DT6K8G2/ Gearmo GM-FTDI2-LED] (FTDI)
			*[https://www.amazon.com/dp/B01AT2FTOU/ DTECH DT-5018] (FTDI, has both 9 and 25 pin connectors)
	*[https://www.amazon.com/dp/B0007T27H8 TRENDnet TU-S9] (Prolific)		*[https://www.amazon.com/dp/B0007T27H8 TRENDnet TU-S9] (Prolific)

Bkw: /* USB */

2021-12-12T19:35:13Z

USB

← Older revision		Revision as of 19:35, 12 December 2021
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	===USB===		===USB===
	*[https://www.amazon.com/dp/B005SYQV9C/ Sabrent SBT-FTDI]		*[https://www.amazon.com/dp/B005SYQV9C/ Sabrent SBT-FTDI] (FTDI)
	*[https://www.amazon.com/dp/B0762BSKGC/ Tera Grande USB2-RS232WN-03]		*[https://www.amazon.com/dp/B0762BSKGC/ Tera Grande USB2-RS232WN-03] (FTDI)
	*[https://www.amazon.com/dp/B01DT6K8G2/ Gearmo GM-FTDI2-LED]		*[https://www.amazon.com/dp/B01DT6K8G2/ Gearmo GM-FTDI2-LED] (FTDI)
	*[https://www.amazon.com/dp/B0007T27H8 TRENDnet TU-S9] (Prolific)		*[https://www.amazon.com/dp/B0007T27H8 TRENDnet TU-S9] (Prolific)

Bkw: /* USB-C */

2021-12-12T19:34:49Z

USB-C

← Older revision		Revision as of 19:34, 12 December 2021
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	===USB-C===		===USB-C===
	*[https://www.amazon.com/dp/B073ZJ6M2X/ Gearmo GM-FTDI2-LED16-C]		*[https://www.amazon.com/dp/B073ZJ6M2X/ Gearmo GM-FTDI2-LED16-C] (FTDI)
	*[https://www.amazon.com/gp/product/B074VN9ZG4/ Startech ICUSB232C] (Prolific)		*[https://www.amazon.com/gp/product/B074VN9ZG4/ Startech ICUSB232C] (Prolific)

Bkw: /* USB-C */

2021-12-12T19:29:26Z

USB-C

← Older revision		Revision as of 19:29, 12 December 2021
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	===USB-C===		===USB-C===
	*[https://www.amazon.com/dp/B073ZJ6M2X/ Gearmo GM-FTDI2-LED16-C]		*[https://www.amazon.com/dp/B073ZJ6M2X/ Gearmo GM-FTDI2-LED16-C]
	*[https://www.amazon.com/gp/product/B074VN9ZG4/ Startech ICUSB232C] (Prolific ~~chip, but works~~)		*[https://www.amazon.com/gp/product/B074VN9ZG4/ Startech ICUSB232C] (Prolific)

	===USB===		===USB===

Bkw: /* USB */

2021-12-12T19:29:06Z

USB

← Older revision		Revision as of 19:29, 12 December 2021
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	*[https://www.amazon.com/dp/B0762BSKGC/ Tera Grande USB2-RS232WN-03]		*[https://www.amazon.com/dp/B0762BSKGC/ Tera Grande USB2-RS232WN-03]
	*[https://www.amazon.com/dp/B01DT6K8G2/ Gearmo GM-FTDI2-LED]		*[https://www.amazon.com/dp/B01DT6K8G2/ Gearmo GM-FTDI2-LED]
			*[https://www.amazon.com/dp/B0007T27H8 TRENDnet TU-S9] (Prolific)

	==Legend==		==Legend==

Bkw: /* USB-Serial Adapters */

2021-12-12T19:13:30Z

USB-Serial Adapters

← Older revision		Revision as of 19:13, 12 December 2021
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	Any one will work well enough. But some considerations are:		Any one will work well enough. But some considerations are:

	Models based on FTDI chips are generally better than the ones based on Prolific chips.		Models based on FTDI chips are generally better than the ones based on Prolific or other chips.

	Try to get a usb-serial adapter that has nuts, not screws.		Try to get a usb-serial adapter that has nuts, not screws.

	Here are a few ideal examples~~, with FTDI chips and jack nuts~~.		Here are a few ideal known-good examples.

	*[https://www.amazon.com/gp/~~product~~/~~B074VN9ZG4/ Startech ICUSB232C] (USB~~-C)		===USB-C===
	*[https://www.amazon.com/dp/~~B073ZJ6M2X~~/ ~~Gearmo GM-FTDI2-LED16-C~~] (~~USB-C~~)		*[https://www.amazon.com/dp/B073ZJ6M2X/ Gearmo GM-FTDI2-LED16-C]
			*[https://www.amazon.com/gp/product/B074VN9ZG4/ Startech ICUSB232C] (Prolific chip, but works)

			===USB===
	*[https://www.amazon.com/dp/B005SYQV9C/ Sabrent SBT-FTDI]		*[https://www.amazon.com/dp/B005SYQV9C/ Sabrent SBT-FTDI]
	*[https://www.amazon.com/dp/B0762BSKGC/ Tera Grande USB2-RS232WN-03]		*[https://www.amazon.com/dp/B0762BSKGC/ Tera Grande USB2-RS232WN-03]

Bkw: /* Summary */

2021-06-08T02:52:15Z

Summary

← Older revision		Revision as of 02:52, 8 June 2021
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	\| TX \|\| 3 \|\| 3 \|\| RX		\| TX \|\| 3 \|\| 3 \|\| RX
	\|-		\|-
	\| DTR \|\| 4 \|\| 6<br>8 \|\| DSR<br>DCD		\| DTR \|\| 4 \|\| 6<br>8 \|\| DSR<br>DCD(note)
	\|-		\|-
	\| SG \|\| 5 \|\| 7 \|\| SG		\| SG \|\| 5 \|\| 7 \|\| SG
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	<br clear=all>		<br clear=all>

	~~<!--~~ Model 100 does not have anything connected to the DCD pin, so you ~~may connect, ignore, or~~ omit pin 8 on the 25-pin end of the cable. ~~-->~~		(note) Model 100 does not have anything connected to the DCD pin, so technically you could omit pin 8 on the 25-pin end of the cable, but the cable itself should still have it just to conform to standards and so there are no mystery surprises when connected to other things. Also perhaps some of the other Model T's besides Model 100 may actually have that pin connected. I haven't checked all models for that detail.

	==Ideal Cables==		==Ideal Cables==

Bkw: /* Summary */

2021-06-08T02:44:43Z

Summary

← Older revision		Revision as of 02:44, 8 June 2021
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	have a DTE pinout, the same as a com port on a PC, but with a female connector, unlike a pc.		have a DTE pinout, the same as a com port on a PC, but with a female connector, unlike a pc.

	This is a backwards configuration from everything else today. This ~~may have been more common before~~ the ~~first IBM pc, and IBM came along later and created a new~~ standard ~~by using male connectors for the COM ports on their PCs~~, ~~probably to distinguish them from the printer port which used a female DB25. But~~ the universal standard '''today''' is that DTE ports are male (9-pin or 25-pin), and a DB25F (25-pin female) is either a parallel printer port or a DCE port on a peripheral (like a modem), not a DTE port on ~~a host (~~a computer).		This is a backwards configuration from everything else today. This was not always the universal standard, but the universal standard ''today''' and ever since the IBM PC, is that DTE ports (serial ports on host computers) are male (9-pin or 25-pin), and a DB25F (25-pin female) is one of 2 things: it is either a parallel printer port, or a DCE port on a peripheral (like a modem or printer), not a DTE port on a computer.

	This means that most serial cables you will find today will need some sort of adapter to connect a "Model T" to anything else~~.<br>~~		This means that most serial cables you will find today will need some sort of adapter to connect a "Model T" to anything else.
	~~If you have a null-modem cable, it will probably have the wrong connectors, in which case you will need either a gender-changer or a 9-to-25 adapter or both.<br>~~
	~~If you have a cable with the right connectors, it is probably a straight-though "modem" cable, in which case you will need at minimum a male-to-female null-modem adapter~~.

	So a single cable with both the right wiring on the inside, and the right connectors on the outside, without needing a stack of adapters, is a little bit special. They do make them, but you just have to search for them specially. Sometimes you can find a cable with that combination of properties by searching for a "Serial Printer" cable. Several known-good ideal cables are linked below.		If you have a null-modem cable, it will probably have female connectors on both ends, and probably will be 9-pin on both ends. You would need either a gender-changer or a 9-to-25 adapter or both to use that.

			If you have a cable with the right connectors on both ends (25 pin male and 9 pin femal), it is probably a straight-through "modem" cable, not a null-modem cable. You would need at minimum a male-to-female null-modem adapter to use that.

			So a single cable with both the right wiring on the inside, and the right connectors on the outside, without needing a stack of adapters, is a little bit special. They do make them, but you just have to search for them specially. Sometimes you can find a cable with that combination of properties by searching for a "Serial Printer" cable.

			Several known-good ideal cables are linked below.

	The ideal cable is this:		The ideal cable is this:

Bkw: /* Software Flow Control Only Cables */

2021-06-08T02:32:50Z

Software Flow Control Only Cables

← Older revision		Revision as of 02:32, 8 June 2021
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	Software flow-control is the only thing any software ever used on these machines, because the system ROM doesn't contain any code to accesses the RTS/CTS pins. The hardware is present and functional, but can only be accessed from machine language programs. [http://bitchin100.com/wiki/index.php?title=HTERM HTERM] and [https://bitchin100.com/wiki/index.php?title=TBACK TBACK] are the only known examples of that.		Software flow-control is the only thing any software ever used on these machines, because the system ROM doesn't contain any code to accesses the RTS/CTS pins. The hardware is present and functional, but can only be accessed from machine language programs. [http://bitchin100.com/wiki/index.php?title=HTERM HTERM] and [https://bitchin100.com/wiki/index.php?title=TBACK TBACK] are the only known examples of that.

	These cables have the correct physical plugs, and correct TX/RX wiring, and have DSR/DTR at least faked, and so they work for all software flow-control applications, which is just about everything, including [[TPDD_Emulators\|TPDD]].		These cables have the correct physical plugs, and correct TX/RX wiring, and have DSR/DTR at least faked, and so they work for all software flow-control applications, which is just about everything, including [[TPDD_Emulators\|TPDD emulators]].

	Special note about TPDD: TPDD clients all require that the DTR pin be connected to something. It can be faked (shorted to the machine's own DSR), or real (connected to the other ends DSR), or even wierder setups like connecting to RTS+CTS, but it has to be connected to something. A minimal 3-conductor cable can still do TPDD as long as it has DTR shorted to DSR at the DB25 ~~connector~~. Many generic cables don't have that but these specific cables all do~~, and these all work for TPDD~~.		Special note about TPDD emulators: [https://github.com/bkw777/dlplus/tree/master/clients TPDD clients] all require that the DTR pin be connected to something. It can be faked (shorted to the machine's own DSR), or real (connected to the other ends DSR), or even wierder setups like connecting to RTS+CTS, but it has to be connected to something. A minimal 3-conductor cable can still do TPDD as long as it has DTR shorted to DSR in the DB25 plug. Many generic cables don't have that but these specific cables all do.

	*[https://www.monoprice.com/product?p_id=479 Monoprice 479]		*[https://www.monoprice.com/product?p_id=479 Monoprice 479]
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	:DSR+CTS<-->DTR		:DSR+CTS<-->DTR
	:No RI		:No RI
	:This is a very unusual type of cable. If you don't have an HP or IBM plotter, I would not recommend getting this. But, strictly for the TX/RX and the physical connectors, as long as the software is ignoring RTS/CTS and DSR/DTR, it does work, so if you do have an HP or IBM plotter, then you could use this for both your plotter and your M100.		:This is a very unusual type of cable. If you don't have an HP or IBM plotter, I would not recommend getting this. But, strictly for the TX/RX and the physical connectors, as long as the software is ignoring RTS/CTS and DSR/DTR, it does work, so if you do have an HP or IBM plotter, then you could use this for both your plotter and your M100. It is included here simply for completeness and reference, not as a suggestion.
	* [https://www.amazon.com/dp/B078M4H4H8 AYA NM9F25M-06]		* [https://www.amazon.com/dp/B078M4H4H8 AYA NM9F25M-06]
	:DCD<-->RTS+CTS		:DCD<-->RTS+CTS