Difference between revisions of "Cirkit serial interface"
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== Technical == | == Technical == | ||
| + | (information from the documentation with the "Prestel Link" software.) | ||
| + | |||
| + | Prestel link hardware: | ||
* 4Mhz clock from expansion bus is clock for 8251 | * 4Mhz clock from expansion bus is clock for 8251 | ||
| − | * Chipset: uses [[8251 USART chip|8251 UART]] | + | * Chipset: uses [[8251 USART chip|8251 UART]] |
| + | * I/O ports are: | ||
| + | FADF read/write data | ||
| + | FBDF read status/write control | ||
| + | |||
| + | |||
* Note - Cirkit reportedly also made a "Twin-port" serial interface (which probably used other chipset) | * Note - Cirkit reportedly also made a "Twin-port" serial interface (which probably used other chipset) | ||
Revision as of 09:57, 30 July 2010
Reportedly, it did "flourish", but almost nothing else is known.
- Some information fragments are here: Cirkit.
Technical
(information from the documentation with the "Prestel Link" software.)
Prestel link hardware:
- 4Mhz clock from expansion bus is clock for 8251
- Chipset: uses 8251 UART
- I/O ports are:
FADF read/write data FBDF read status/write control
- Note - Cirkit reportedly also made a "Twin-port" serial interface (which probably used other chipset)
Pictures
Circuit board, etc.
Downloads
- None such...?
Specs (from advert)
- Fully compatible with the CPC464, CPC664 and CPC6128.
- Plugs into Disk Drive, through Bus Connector for Disk Drives and other peripherals.
[Note: On the CPC 464, the "Expansion Port" was called "Floppy Port", this is probably what is meant by "into Disk Drive"]
[Note: The photo in advert seems to be a fake. It looks like a 2x28 pin expansion for Sinclair Spectrum, re-badged as Amstrad Interface for the advert] - Can be used to interface to other RS232 devices, such as Modems, Plotters and Printers.
- Baud rates supported 75/1200, 1200/1200 and 300/300
- INPUTS:- Data, one handshake - RS232 compatible
- OUTPUTS:- Data, one handshake - +5 volt positive going Works with all TTL level inputs and most RS232 devices.
- All interface features are software addressable, uses 8251 UART.
- Supplied with full RSX drivers, which may be used in your own programs.
- Not directly compatible with Amstrad CPM.
- Extensive documentation about interface and RSX's supplied on cassette.
