Changes

[[RS232 ]] Interface for the CPC by [[Schneider]]. Schneider is the german German distributor for Amstrad CPC hardware (however, thisinterface seems to be was Schneider's own invention, not an [[Amstrad ]] product).

== Clones == The shape of the case dates back to a original [[Schneider BTX modul (which RS232 Interface]] was being intended to be plugged into released around 1985. Two years later, in 1987, a software-compatible clone was released as DIY schematic in a German book ([[Maschinenspracheprogramme und Hardware-Erweiterungen für Schneider Television SetsCPC's|link]]). Apparently Schneider produced too many casesEven later, and re-used them for around 1996, a copy of that DIY schematic also circulated in the internet ([[Tim Riemann's RS232 interface|link]]). The DIY port address, timings and handshake signals are exactly the same as in the original Schneider version - except that DCD (Data Carrier Detect) isn't implemented in the DIY version.

Image:Schneider rs232.jpg|InterfaceImage:schneider rs232 1.jpg|DescriptionFileImage:NoPictureTerje Schneider RS232 PCB top.gifjpg|PCB topImage:Terje Schneider RS232 PCB bottom.jpg|PCB bottomImage:Schneider RS232 Interface.jpg|InterfaceImage:Schneider-sio-front.jpg|Front PlateImage:Schneider-sio-label.jpg|LabelImage:Schneider-sio-lead.jpg|Expansion Port CableImage:Schneider-sio-psu.jpg|Power Supply</gallery> <gallery caption="Schneider RS232 interface 300dpi scans by Robcfg">Image:Schneider_RS232_Unit.jpg|InterfaceImage:Schneider_RS232_Unit_Bottom.jpg|Front PlateImage:Schneider_RS232_PCB_Top.jpg|PCB TopImage:Schneider_RS232_PCB_Bottom.jpg|Circuit BoardPCB Bottom

Default I/O addresses are F8E0h-F8EFh (though the interface can be jumpered to use different addresses).  F8E0h - [[Z80 -STI ]] Indirect Data Register Read Write F8E1h - [[Z80 -STI Gen. ]] General Purpose I/O Data Register F8E2h - [[Z80-STI]] Interrupt Pending Register B ;\ F8E3h - [[Z80-STI]] Interrupt Pending Register A ; F8E4h - [[Z80-STI]] Interrupt in-Service Register B Read Write; not used F8E5h - [[Z80-STI]] Interrupt in-Service Register A ; F8E6h - [[Z80-STI]] Interrupt Mask Register B ; F8E7h - [[Z80-STI]] Interrupt Mask Register A ;/ F8E8h - [[Z80 -STI Pointer ]] Indirect Index and Interrupt Vector Register Read Write F8E9h - [[Z80-STI]] Timers A and B Control Register ;\ F8EAh - [[Z80-STI]] Timer B Data Register ; not used F8EBh - [[Z80-STI]] Timer A Data Register ;/ F8ECh - [[Z80 -STI ]] USART Control Register Read Write F8EDh - [[Z80 -STI ]] Receiver Status Register Read Write F8EEh - [[Z80 -STI ]] Transmitter Status Register Read Write F8EFh - [[Z80 -STI ]] USART Data Register Read Write Aside from the above 16 directly addressable registers, there are 8 indirectly addressable ones. For details on the direct & indirect registers, see [[Z80-STI]].

* Supported by "Starwriter".* BASIC example (for the official version) is found in the Schneider RS232 manual (see below scans)* ASM example (for the DIY version) is included with [[Tim Riemann's RS232 interface]] == Datasheet Manual (MissingGerman) == <gallery>File:SchneiderSioManualPage1.jpg|Page 1 (cable / jumpers)File:SchneiderSioManualPage2.jpg|Page 2 (schematic)File:SchneiderSioManualPage3.jpg|Page 3 (z80-sti registers)File:SchneiderSioManualPage4.jpg|Page 4 (blank / footer)</gallery> == Note == The uncommon shape of the housing dates back to a Schneider BTX modul (which was being intended to be plugged into Schneider Television Sets). Apparently Schneider produced too many housings, and re-used them for the RS232 interface. Actually, a RS232 interface is very much the same as a BTX interface (the actual BTX modem must be rented separately from Deutsche Bundespost), so even the PCB may be (almost/exactly?) the same for both devices. == Reviews ==

* A "Z80 STI" is a 40pin MK3801 chip from Mostek. Details on that chip are reportedly found review appeared in the "MOSTEK 1982/1983 Microelectronic Data Book" German magazine [[CPC Schneider International]] (there is no datasheet in the internet yetissue 12-1985, pages [[Media:Schneider International 8512-p038 - Schneider RS232.jpg|38]], [[Media:Schneider International 8512-p039 - Schneider RS232.jpg|39]]).

== Info Fragment from a german forum (german) ==* Servus, das ist definitiv eine Schneider Rs2332A [[Media:Mostek_3801_Data. Die ist nicht Amstrad kompatibelpdf|"Z80 STI"]] is a 40pin [[Media:Mostek_3801_Data. Die komischen Gehäuse hat Schneider, so richtig Amstrad typisch, wgpdf|MK3801]] chip from Mostek. kosten genommen. Es gab in der Vergangeheit für den Schneider Fernseher ein BTX Modul, was direkt in den Details on that chip are from the "HighEndMOSTEK 1982/1983 Microelectronic Data Book" Fernseher gesteckt werden konnte(kindly made available by John Robertson). Vorne kam dann die Tastatur dran. So konnte man mit dem Fernseher komplett BTX machen. Hat sich aber wohl nicht verkauft, oder die Produktion hat zu viele Gehäuse für das BTX-Steckmodul gemacht. So hat man die für die RS232 genommen. Genauso schauts mit der Basisplatine des BTX Modules aus, die eben diese Form mit diesem Stecker hatte. Dabei war eben noch ein Kuzes Kabel, das dann einen Platinenstecker auf beiden Seiten oder eben Platinenstecker und Centronics hatte. Das kabel ist nicht 1zu1 gekrimpt, sondern es sind da soweit ich mich erinnern kann einige Pins frei und ich glaub das auch gedrehte Kabel dabei waren. Hope that helps, Tolkin

[[Category:Hardware]] [[Category:Peripherals]] [[Category:Serial_interfaces]]