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:
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
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| 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) |
Schematics
Motherboard
Centronics
Uni-PIO
RS232
Power Supply
DAC/ADC
RTC
SRAM/EPROM
Eprom Burner
Pictures
Schneiderware #2
Basisplatine (component side)
Schneiderware #2
Basisplatine (solder side)
Schneiderware #2
Centronics (component side)
Schneiderware #2
Centronics (solder side)
Schneiderware #3
V24 (component side)
Schneiderware #3
V24 (solder side)
Schneiderware #4
Supply/Netzteil (only +12V/-12V components installed)
Schneiderware #4
Supply/Netzteil (solder side)
Schneiderware #5
RTC/Echtzeituhr (component side)
Schneiderware #5
RTC/Echtzeituhr (solder side)
Schneiderware #6
Uni-PIO (component side)
Schneiderware #6
Uni-PIO (solder side)
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Software
Databoxes: UHR8000 RTC-RAM-driver in 10-1986 (hex listing, plus Hisoft Devpac source code) (caution this version uses incorrect I/O addresses FBE1-FBE3), UHRC000X RTC-ROM-driver in 4-1987 (this version uses correct I/O addresses FBE2-FBE4). Uni-PIO examples in 12-1986 (=only a few basic lines). There seem to be no Centronics and V/24 drivers included in databoxes.
Datasheets
- 8251 Datasheet - older 8251 datasheet (pin-outs only, without programming info)
- 8251A Datasheet - newer 8251A datasheet (detailed info)
- 8253 Datasheet - 8253 Timer Datasheet (slower clock, write-only control registers)
- 8254 Datasheet - 8254 Timer Datasheet (faster clock, read/write-able control registers, otherwise compatible with 8253)
- 8255 Datasheet - PPI Datasheet (Mitsubishi)
- ADC0848 Datasheet.pdf - 8 channel A/D converter
- DAC0832 Datasheet.pdf - 1 channel D/A converter
- LM323 Datasheet - 3-pin 5V voltage converter (used by the power supply)
- L200 Datasheet - 5-pin variable-voltage converter (seems to be used by an alternate version of the power supply)
- M5832 Datasheet - Real time clock
Info on various ECB Bus variants can be found here: EBC Bus.