Difference between revisions of "Schneiderware Summary"

Revision as of 14:32, 30 September 2010

This page contains a summary of Schneiderware related info. For details refer to the separate pages (links are found on the Schneiderware page.

I/O Port Summary

Address (default)	Address (alternate)	Usage
DFxxh	N/A	Schneiderware RAM/EPROM - Expansion ROM bank number (W) Battery-backed SRAM and/or EPROM are selected when the bank-number matches the jumper-selected values; the memory is then mapped to C000h..FFFFh (in case of READing one must also enable upper ROM via Gate Array). The bank number decoding is a bit strange: EPROM/Read bank: All 8 bits decoded (bank 00h..FFh) SRAM/Read bank: Only lower 4 bits decoded (bank X0h..XFh) SRAM/Write bank: Only lower 4 bits decoded (bank X0h..XFh) The SRAM/Write mode doesn't disable the internal RAM in the CPC, so writes are going both to SRAM and normal RAM at C000-FFFF, that no matter if upper ROM is enabled/disabled via Gate Array; the author recommended to map VRAM to 4000-7FFF via CRTC registers, in order to prevent video dirt during writing.
F8E0h	F8F0h (later redefined to F8E4h)	Schneiderware Centronics Port 8255 PPI Port A (data)
F8E1h	F8F1h (later redefined to F8E5h)	Schneiderware Centronics Port 8255 PPI Port B (unused)
F8E2h	F8F2h (later redefined to F8E6h)	Schneiderware Centronics Port 8255 PPI Port C (busy/strobe) (bit7=busy, bit6-1=unused, bit0=strobe; strobe is externally inverted) (autolf is wired to GND, all other control/status signals are not connected)
F8E3h	F8F3h (later redefined to F8E7h)	Schneiderware Centronics Port 8255 PPI Control
F8E8h	F8F0h, F8F8h	Schneiderware Uni-PIO 8255 PPI #1 Port A (without pull-ups, with red LEDs)
F8E9h	F8F1h, F8F9h	Schneiderware Uni-PIO 8255 PPI #1 Port B (with pull-ups and green LEDs)
F8EAh	F8F2h, F8FAh	Schneiderware Uni-PIO 8255 PPI #1 Port C (lower 4bit without pull-ups and red LEDs, upper 4bit with pull-ups and green LEDs)
F8EBh	F8F3h, F8FBh	Schneiderware Uni-PIO 8255 PPI #1 Control
F8ECh	F8F4h, F8FCh	Schneiderware Uni-PIO 8255 PPI #2 Port A (without pull-ups or LEDs)
F8EDh	F8F5h, F8FDh	Schneiderware Uni-PIO 8255 PPI #2 Port B (without pull-ups or LEDs)
F8EEh	F8F6h, F8FEh	Schneiderware Uni-PIO 8255 PPI #2 Port C (without pull-ups or LEDs)
F8EFh	F8F7h, F8FFh	Schneiderware Uni-PIO 8255 PPI #2 Control
F9E0h	F9E2h	Schneiderware V/24 Interface 8251 USART Data
F9E1h	F9E3h	Schneiderware V/24 Interface 8251 USART Control
F9ECh	F9E8h	Schneiderware V/24 Interface 8253 Timer 0 (TX clock)
F9EDh	F9E9h	Schneiderware V/24 Interface 8253 Timer 1 (RX clock)
F9EEh	F9EAh	Schneiderware V/24 Interface 8253 Timer 2 (unused)
F9EFh	F9EBh	Schneiderware V/24 Interface 8253 Timer Control Note: Timer clock input is jumper select-able: 2MHz (default), or 1MHz
FAE0h	N/A	Schneiderware Analog Converter ADC 0848 A/D Converter (R/W) Read: Get 8bit data from selected channel Write: Select channel & mode; bit0..2=channel (0..7), bit3..4=mode, bit5-7=unused Mode 0 (or 1) - Differential: Plus=Channel(N), Minus=Channel(N XOR 1) Mode 2 - Single-Ended: Plus=Channel(N) and Minus=AGND Mode 3 - Pseudo-Differential: Plus=Channel(N) and Minus=Channel(7)
FAE1h	N/A	Schneiderware Analog Converter DAC 0832 D/A Converter #1 (W) Write: 8bit data
FAE2h	N/A	Schneiderware Analog Converter DAC 0832 D/A Converter #2 (W) Write: 8bit data
FAF0h	N/A	Schneiderware EPROM Burner 8255 PPI #1 Port A (Data, 8bit)
FAF1h	N/A	Schneiderware EPROM Burner 8255 PPI #1 Port B (Address LSBs, 8bit)
FAF2h	N/A	Schneiderware EPROM Burner 8255 PPI #1 Port C (Address MSBs, 7bit; bit7=unused)
FAF3h	N/A	Schneiderware EPROM Burner 8255 PPI #1 Control
FAF4h	N/A	Schneiderware EPROM Burner 8255 PPI #2 Port A (bit0-7=unused)
FAF5h	N/A	Schneiderware EPROM Burner 8255 PPI #2 Port B (bit0-5=unused, bit6=Red LED, bit7=Green LED)
FAF6h	N/A	Schneiderware EPROM Burner 8255 PPI #2 Port C (programming signals, 8bit)
FAF7h	N/A	Schneiderware EPROM Burner 8255 PPI #2 Control
FBE2h	BUGGED:FBE1h	Schneiderware Real Time Clock Index/Control (W)
FBE3h	BUGGED:FBE2h	Schneiderware Real Time Clock Data 4bit (W)
FBE4h	BUGGED:FBE3h	Schneiderware Real Time Clock Data 4bit (R)