BCR TTL SERIAL HACK - Revision history

Sadolph: /* BCR Hack */

2024-05-05T13:51:56Z

BCR Hack

← Older revision		Revision as of 06:51, 5 May 2024
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	==BCR Hack==		==V1 BCR Hack==

	This the original BCR hack, and is supported in both CP/M and VT100 driver.		This the original BCR hack, and is supported in both CP/M and VT100 driver.

Sadolph at 13:51, 5 May 2024

2024-05-05T13:51:28Z

← Older revision		Revision as of 06:51, 5 May 2024
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	=== The Hardware Modification ===		=== The V1 Hardware Modification ===

			quick hint- use V2!

	====M100====		====M100====
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	(2) Connect from M34 pin 2 (not pin 12) to pin 3 of the BCR port.		(2) Connect from M34 pin 2 (not pin 12) to pin 3 of the BCR port.

	==~~NSC800~~ BCR Hack==		== The V2 BCR Hack ==

			This hack is a variant that I use for NSC800 based M100, and CP/M.
			It's great because it actually works for either processor, making it more generic.

	~~This hack is a variant that I use for NSC800 based M100, and CP/M.~~
	Basically this hack is only useful with NSC800, and it was needed because the NSC800 does not support SIM instruction, so there is no SOD pin.		Basically this hack is only useful with NSC800, and it was needed because the NSC800 does not support SIM instruction, so there is no SOD pin.
	Documented here for completion, but I don't think now that it should be mainstream, because the original hack is slightly simpler to do, and is already supported with VT100 and CP/M.		Documented here for completion, but I don't think now that it should be mainstream, because the original hack is slightly simpler to do, and is already supported with VT100 and CP/M.
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	* Tandy 102		* Tandy 102

	=== The Hardware Modification ===		=== The V2 Hardware Modification ===

	This improved implementation is more universal. SOD pin is available on 80C85 but not Z80. The original modification therefore cannot work on NSC800. By utilizing the /REMOTE signal on the CASSETTE port, we can accomplish the same thing...making this hack usable with both NSC800 and 80C85 processors.		This improved implementation is more universal. SOD pin is available on 80C85 but not Z80. The original modification therefore cannot work on NSC800. By utilizing the /REMOTE signal on the CASSETTE port, we can accomplish the same thing...making this hack usable with both NSC800 and 80C85 processors.
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	=== 57600 Baud Tx/Rx Routines for 80C85 and the original BCR Hack circuit ===		=== 57600 Baud Tx/Rx Routines for 80C85 and the original V1 BCR Hack circuit ===

	Currently both CP/M and my own VT100 driver uses 57600, and employsthe modification posted here.		Currently both CP/M and my own VT100 driver uses 57600, and employsthe modification posted here.
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	Faster transmission is possible; both 115600 and 128000 baud have been demonstrated. The core Tx routines are provided here. Can the Rx function run faster than 57600? A bit more on that below.		Faster transmission is possible; both 115600 and 128000 baud have been demonstrated. The core Tx routines are provided here. Can the Rx function run faster than 57600? A bit more on that below.

	These routines are tested and work for sending a byte at the rate stated.		These routines are tested and work for sending a byte at the rate stated (again for V1 hack).

	for Tx at 57600 baud:		for Tx at 57600 baud:
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	[[Media:bcrtx_128000.zip\|bcrtx_128000.asm]]		[[Media:bcrtx_128000.zip\|bcrtx_128000.asm]]

	=== 57600 Baud Tx Routine for NSC800 and 80C85 with the ~~modified~~ BCR Hack ===		=== 57600 Baud Tx Routine for NSC800 and 80C85 with the V2 BCR Hack ===

	The following code has been used to patch CP/M, when using NSC800 processor and the associated BCR hack.		The following code has been used to patch CP/M, when using NSC800 processor and the associated V2 BCR hack.
	This code uses only 8080 opcodes, so it runs on either processor, actually.		This code uses only 8080 opcodes, so it runs on either processor, actually.
	The timing is subtly different, but it manages to "just work".		The timing is subtly different, but it manages to "just work".

Sadolph at 22:46, 23 November 2023

2023-11-23T22:46:46Z

← Older revision		Revision as of 15:46, 23 November 2023
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	[[Category:Model T Hardware]]		[[Category:Model T Hardware]]


			[[Category:Model T Video]]

Sadolph: /* The Hardware Modification */

2021-01-15T22:26:57Z

The Hardware Modification

← Older revision		Revision as of 15:26, 15 January 2021
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	=== The Hardware Modification ===		=== The Hardware Modification ===

			====M100====

	The core of the modification is to connect pin 3 of the BCR port to the SOD output of the CPU. This is accomplished by adding a single wire to the PCB.		The core of the modification is to connect pin 3 of the BCR port to the SOD output of the CPU. This is accomplished by adding a single wire to the PCB.
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	[[Image:layout2.png\|\|center]]<br/>		[[Image:layout2.png\|\|center]]<br/>

			====T102====

			Notes:
			Hack is basically the same, with 2 differences.
			(1) You need to add a ground wire between pins 5 and 7 on the BCR port.
			(2) Connect from M34 pin 2 (not pin 12) to pin 3 of the BCR port.

	==NSC800 BCR Hack==		==NSC800 BCR Hack==

Sadolph: /* Supported Models */

2021-01-15T22:24:41Z

Supported Models

← Older revision		Revision as of 15:24, 15 January 2021
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	=== Supported Models ===		=== Supported Models ===
	* TRS-80 Model 100		* TRS-80 Model 100
	* ~~a hardware hack for T102 is likely however not explored at this time~~		* Tandy 102


	=== The Hardware Modification ===		=== The Hardware Modification ===

Sadolph: /* NSC800 BCR Hack */

2021-01-10T13:13:42Z

NSC800 BCR Hack

← Older revision		Revision as of 06:13, 10 January 2021
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	'''Note'''		'''Note'''
	This hack happens to work on both NSC800 and 80C85.		This hack happens to work on both NSC800 and 80C85.
	But, it is slightly more work to ~~use~~, and CP/M already leverages the original Hack.		But, it is slightly more work to implement, and CP/M already leverages the original Hack.
	And, no one in the world other than me is using the NSC800 ;).		And, no one in the world other than me is using the NSC800 ;).

Sadolph: /* NSC800 BCR Hack */

2021-01-10T13:13:25Z

NSC800 BCR Hack

← Older revision		Revision as of 06:13, 10 January 2021
Line 70:		Line 70:
	Basically this hack is only useful with NSC800, and it was needed because the NSC800 does not support SIM instruction, so there is no SOD pin.		Basically this hack is only useful with NSC800, and it was needed because the NSC800 does not support SIM instruction, so there is no SOD pin.
	Documented here for completion, but I don't think now that it should be mainstream, because the original hack is slightly simpler to do, and is already supported with VT100 and CP/M.		Documented here for completion, but I don't think now that it should be mainstream, because the original hack is slightly simpler to do, and is already supported with VT100 and CP/M.

			'''Note'''
			This hack happens to work on both NSC800 and 80C85.
			But, it is slightly more work to use, and CP/M already leverages the original Hack.
			And, no one in the world other than me is using the NSC800 ;).


	===Status===		===Status===

Sadolph: /* Status */

2021-01-10T13:11:27Z

Status

← Older revision		Revision as of 06:11, 10 January 2021
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	* currently supported in CPM210/410 as CASS video option		* currently supported in CPM210/410 as CASS video option
	* supported in Version 2 REX#/REXCPM		* supported in Version 2 REX#/REXCPM
			* well tested


	=== Supported Models ===		=== Supported Models ===

Sadolph: /* NSC800 BCR Hack */

2021-01-10T13:11:11Z

NSC800 BCR Hack

← Older revision		Revision as of 06:11, 10 January 2021
Line 68:		Line 68:
	==NSC800 BCR Hack==		==NSC800 BCR Hack==

	This hack is a variant that I use for NSC800 based M100, and CP/M. Documented here for completion, but I don't think now that it should be mainstream, because the original hack is slightly simpler to do, and is already supported with VT100 and CP/M.		This hack is a variant that I use for NSC800 based M100, and CP/M.
			Basically this hack is only useful with NSC800, and it was needed because the NSC800 does not support SIM instruction, so there is no SOD pin.
			Documented here for completion, but I don't think now that it should be mainstream, because the original hack is slightly simpler to do, and is already supported with VT100 and CP/M.

	===Status===		===Status===
	* CP/M: currently supported in CPM210/410 as CASS video option (via patch from me)		* CP/M: currently supported in CPM210/410 as CASS video option (via patch from me)
			* tested and working well

Sadolph: /* What is this all about? */

2021-01-10T13:09:37Z

What is this all about?

← Older revision		Revision as of 06:09, 10 January 2021
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	This hacks shown here enable the BCR port to send and receive half duplex serial TTL signals. The BCR port is already set up for TTL receive function as this is used for the Bar Code Reader function. So these hacks provides facility to transmit as well. In addition I provide some software routines that demonstrate the capability.		This hacks shown here enable the BCR port to send and receive half duplex serial TTL signals. The BCR port is already set up for TTL receive function as this is used for the Bar Code Reader function. So these hacks provides facility to transmit as well. In addition I provide some software routines that demonstrate the capability.

	There are 2 modifications described. I recommend the ~~improved~~ hack, as it works with both 8085 and ~~NSC800 processors~~. For CP/M users, a patch is available which can be applied to CPM410/210 to update the CASS functionality.		There are 2 modifications described. I recommend the oroginal hack, as it works with both 8085 processors and is integrated into both CP/M and VT100 driver.

			For CP/M users that have an NSC800 processor installed (I think I am the only one in the world!), a patch is available which can be applied to CPM410/210 to update the CASS functionality to use the NSC800 specific BCR Hack.

	BCR port serial TTL is supported in Model 100 CP/M as well as with the MVT100 Driver, for use with MVT100 Terminal or other VT100 CRT solution.		BCR port serial TTL is supported in Model 100 CP/M as well as with the MVT100 Driver, for use with MVT100 Terminal or other VT100 CRT solution.