Z80 STI RS232 interface - Revision history

Ygdrazil at 10:35, 26 August 2014

2014-08-26T10:35:46Z

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	[[File:Rs232cpc.lzh]] - All info and files on topic		[[File:Rs232cpc.lzh]] - All info and files on topic

			[[Category:Peripherals]]

Octoate: /* Intro */ - anonymized image name

2011-04-29T20:50:23Z

Intro: - anonymized image name

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	Image:SchneiderSioManualPage2.jpg\|Schneider's Schematic (1985)		Image:SchneiderSioManualPage2.jpg\|Schneider's Schematic (1985)
	Image:NoPicture.png\|Paul Bauriedl's Schematic (1987)		Image:NoPicture.png\|Paul Bauriedl's Schematic (1987)
	Image:Tim Riemann RS232.gif\|~~Tim Riemann's~~ Schematic (1996)		Image:Tim Riemann RS232.gif\|Z80 STI Schematic (1996)
	</gallery>		</gallery>

Octoate: moved Tim Riemann's RS232 interface to Z80 STI RS232 interface: The title shouldn't contain a real name

2011-04-29T20:44:17Z

moved Tim Riemann's RS232 interface to Z80 STI RS232 interface: The title shouldn't contain a real name

← Older revision	Revision as of 20:44, 29 April 2011
(No difference)

Nocash: /* Intro */

2010-08-09T19:35:19Z

Intro

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	The circuit is nearly indentical to the [[Schneider RS232 Interface]] from 1985, both circuits are using a [[Media:Mostek_3801_Data.pdf\|Z80 STI]], both mapped to the same I/O port addresses. Both circuits are driven by the 4MHz signal on the CPC's expansion port, and connect CTS/RTS/DSR/DTR to the same pins, so they are (almost) 100% compatible. Some differences:		The circuit is nearly indentical to the [[Schneider RS232 Interface]] from 1985, both circuits are using a [[Media:Mostek_3801_Data.pdf\|Z80 STI]], both mapped to the same I/O port addresses. Both circuits are driven by the 4MHz signal on the CPC's expansion port, and connect CTS/RTS/DSR/DTR to the same pins, so they are (almost) 100% compatible. Some differences:
	* The Schneider circuit additionally implements CHRDET.		* The Schneider circuit additionally implements CHRDET.
	* The Schneider circuit contains 2 diodes and 2 ~~diodes~~ for converting ~8V AC to +/-8V DC.		* The Schneider circuit contains 2 diodes and 2 capacitors for converting ~8V AC to +8V/-8V DC.
	* The Schneider circuit uses only 2 chips for port decoding (the overcomplicated DIY uses 5 chips for exactly the same purpose)		* The Schneider circuit uses only 2 chips for port decoding (the overcomplicated DIY uses 5 chips for exactly the same purpose)

Octoate: /* Intro */

2010-05-13T22:31:49Z

Intro

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	== Intro ==		== Intro ==

	This interface was originally described in the book "[[Maschinenspracheprogramme und Hardware-Erweiterungen für Schneider CPC's]]" written by [[Paul Bauriedl]], released by IDEA Verlag in 1987. Around mid-nineties, ~~Tim Riemann has~~ circulated ~~the schematic as GIF~~ in the internet.		This interface was originally described in the book "[[Maschinenspracheprogramme und Hardware-Erweiterungen für Schneider CPC's]]" written by [[Paul Bauriedl]], released by IDEA Verlag in 1987. Around mid-nineties, it was turned into a single package and circulated in the internet.

	The circuit is nearly indentical to the [[Schneider RS232 Interface]] from 1985, both circuits are using a [[Media:Mostek_3801_Data.pdf\|Z80 STI]], both mapped to the same I/O port addresses. Both circuits are driven by the 4MHz signal on the CPC's expansion port, and connect CTS/RTS/DSR/DTR to the same pins, so they are (almost) 100% compatible. Some differences:		The circuit is nearly indentical to the [[Schneider RS232 Interface]] from 1985, both circuits are using a [[Media:Mostek_3801_Data.pdf\|Z80 STI]], both mapped to the same I/O port addresses. Both circuits are driven by the 4MHz signal on the CPC's expansion port, and connect CTS/RTS/DSR/DTR to the same pins, so they are (almost) 100% compatible. Some differences:

Nocash: /* Schematic and source code */

2010-05-11T12:12:28Z

Schematic and source code

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	First about the connection plan: You need a power supply that supports +9V,-9V and 5V. Connect all pins. You have to connect D0..D7 from the adressbus with the Z80 STI. You have to connect D0 with pin 21, D1 with pin 22, ..., D7 with pin 28. That's all.		First about the connection plan: You need a power supply that supports +9V,-9V and 5V. Connect all pins. You have to connect D0..D7 from the adressbus with the Z80 STI. You have to connect D0 with pin 21, D1 with pin 22, ..., D7 with pin 28. That's all.
	Now you can plug in the interface in the CPC. Switch the power on. If the CPC doesn't work normal please switch the power off and you have to watch for faults in the connection of your interface :-(. If everything is ok then you have to copy the assembler code and do the next test.		Now you can plug in the interface in the CPC. Switch the power on. If the CPC doesn't work normal please switch the power off and you have to watch for faults in the connection of your interface :-(. If everything is ok then you have to copy the assembler code and do the next test.

			'''Bugs and Confusing things in the GIF schematic:'''
			* Confusing: Signals 0..15 on the left side of the schematic refer to address lines A0..A15
			* Bug: Z80-STI Pin 3 (TCO) should be wired to Pin 39 (RC), not to Pin 34 (A1).

	Second part: How to program the interface. (The assembler code is saved in RS232.ASM)		Second part: How to program the interface. (The assembler code is saved in RS232.ASM)

Nocash: /* Intro */

2010-05-10T21:36:17Z

Intro

← Older revision		Revision as of 21:36, 10 May 2010
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	This interface was originally described in the book "[[Maschinenspracheprogramme und Hardware-Erweiterungen für Schneider CPC's]]" written by [[Paul Bauriedl]], released by IDEA Verlag in 1987. Around mid-nineties, Tim Riemann has circulated the schematic as GIF in the internet.		This interface was originally described in the book "[[Maschinenspracheprogramme und Hardware-Erweiterungen für Schneider CPC's]]" written by [[Paul Bauriedl]], released by IDEA Verlag in 1987. Around mid-nineties, Tim Riemann has circulated the schematic as GIF in the internet.

	The circuit is nearly indentical to the [[Schneider RS232 Interface]] from 1985, both circuits are using a [[Media:Mostek_3801_Data.pdf\|Z80 STI]], both mapped to the same I/O port addresses. Both circuits ~~seem to be~~ driven by the 4MHz signal on the CPC's expansion port, so ~~even the the timings should be~~ 100% compatible. The ~~only difference is that the DIY~~ circuit ~~uses more logic chips for decoding of the I/O port addresses (the extra chips are just more over-complicated, not actually better)~~. ~~Another difference, concerning the power supply, is that the~~ Schneider circuit contains 2 diodes and 2 diodes for converting ~7V AC to +/-7V DC.		The circuit is nearly indentical to the [[Schneider RS232 Interface]] from 1985, both circuits are using a [[Media:Mostek_3801_Data.pdf\|Z80 STI]], both mapped to the same I/O port addresses. Both circuits are driven by the 4MHz signal on the CPC's expansion port, and connect CTS/RTS/DSR/DTR to the same pins, so they are (almost) 100% compatible. Some differences:
			* The Schneider circuit additionally implements CHRDET.
			* The Schneider circuit contains 2 diodes and 2 diodes for converting ~8V AC to +/-8V DC.
			* The Schneider circuit uses only 2 chips for port decoding (the overcomplicated DIY uses 5 chips for exactly the same purpose)

	<gallery>		<gallery>

Nocash: /* Used components: */

2010-05-10T20:58:49Z

Used components:

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	Note: The 74LS20, 74LS04, 74LS32 are the smaller logic symbols in the schematic.		Note: The 74LS20, 74LS04, 74LS32 are the smaller logic symbols in the schematic.

	Note 2: The 74LS138 splits the address space to four regions (which is total nonsense), the 74LS20 is then merging them back to a single region (which is undoing that nonsense). ~~There seems to be no real reason for doing that - except maybe to avoid legal copyright problems (claiming something like "no~~ this ~~isn't a unlicensed remake of Schneider's schematic~~, ~~our schematic is doing total nonsense~~, ~~it's has absolutely nothing to do with Schneider's hardware")~~.		Note 2: The 74LS138 splits the address space to four regions (which is total nonsense), the 74LS20 is then merging them back to a single region (which is undoing that nonsense). Although the 74LS138 is rather useless in this case, the book from Paul Bauriedl contains further schematics, in which the 74LS138 does have some purpose.

	== Downloads ==		== Downloads ==

	[[File:Rs232cpc.lzh]] - All info and files on topic		[[File:Rs232cpc.lzh]] - All info and files on topic

Nocash: /* About the assembler code */

2010-05-10T19:35:41Z

About the assembler code

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	6 = 1200 bps		6 = 1200 bps
	7 = 2400 bps		7 = 2400 bps

	Number of stop bits: 1 = 1 stop bit		Number of stop bits: 1 = 1 stop bit
	0 = 2 stop bit		0 = 2 stop bit

	Data bits: 0 = 7 data bits		Data bits: 0 = 7 data bits
	1 = 8 data bits		1 = 8 data bits

	Parity even/odd: 1 = even		Parity even/odd: 1 = even
	0 = odd		0 = odd

	Parity on/off: 1 = on		Parity on/off: 1 = on
	0 = off		0 = off

Nocash: /* About the assembler code */

2010-05-10T19:35:16Z

About the assembler code

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	'''\|FORMAT''', number of bps, number of stop-bits, data bits, parity on/off, parity even/odd		'''\|FORMAT''', number of bps, number of stop-bits, data bits, parity on/off, parity even/odd

	Number of bps:		Number of bps: 0 = 50 bps
			1 = 75 bps
			2 = 110 bps
			3 = 150 bps
			4 = 300 bps
			5 = 600 bps
			6 = 1200 bps
			7 = 2400 bps

	0 = ~~50 bps~~		Number of stop bits: 1 = 1 stop bit
	1 = ~~75 bps~~		0 = 2 stop bit
	2 ~~= 110 bps~~
	~~3 = 150 bps~~
	~~4 = 300 bps~~
	~~5 = 600 bps~~
	~~6 = 1200 bps~~
	~~7 = 2400 bps~~

	~~Number of stop~~ bits: 1 = 1 ~~stop bit~~		Data bits: 0 = 7 data bits
	0 = ~~2 stop bit~~		1 = 8 data bits

	~~Data bits~~: 0 = ~~7 data bits~~		Parity even/odd: 1 = even
	1 = ~~8 data bits~~		0 = odd

	Parity: 1 = ~~even~~		Parity on/off: 1 = on
	0 = ~~odd~~		0 = off

	~~Parity:~~ 1 ~~= on~~		Normally, you use 8N1 for connection with BBS's you can initialise this with \|FORMAT, number of bps, 1, 1, 0, 1.
	0 ~~= off~~

	~~Normally, you use 8N1 for connection with BBS's you can initialise this with~~		'''\|RECORD, @a$''' - The incoming chars will be read in a string. Control codes will be send to the string, too, because sometimes you need it for binary transmissions.
	~~\|FORMAT, number of bps, 1, 1, 0, 1.~~


	'''\|RECORD~~'''~~, @a$
	The incoming chars will be read in a string. Control codes will be send to the
	string, too, because sometimes you need it for binary transmissions.


	~~'''\|SEND''', @a$~~
	~~The string is send until it ends, except you press ESC. The program will not~~
	~~send CR or LF, so you can use this for binary transmission~~.

			'''\|SEND, @a$''' - The string is send until it ends, except you press ESC. The program will not send CR or LF, so you can use this for binary transmission.

	== Used components: ==		== Used components: ==