8bit ISA Floppy Disk and Serial RS232 Controller by Sergey Kiselev


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Location: Riga
Ships to: US,
Item: 326157741484

All returns accepted:ReturnsNotAccepted
Compatible Brand:Sergey Kiselev
Type:Floppy controller, ROM, RS232
Vintage:Yes

Original PCB design by Sergey Kiselev. Specifications Floppy disk controller based on Intel 82077AA or National Semiconductor PC8477 FDC IC. Supports IBM PC, AT, and PS/2 floppy types from 160 KB 5.25″ single side disks to 2.88 MB 3.5″ ED (Extended Density) disks.Supports 2.88 MB IBM PS/2 drives (e.g. IBM FRU 64F4148 and IBM FRU 64F0204), that require +5V on pin 3. This feature is enabled using jumper JP1. Serial port. Uses UART IC in PLCC package, supports newer UART versions such as 16C650 and 16C750 with extended FIFO.Also compatible with 16550 and 16450 ICs in PLCC package.UART I/O address and interrupt is selectable using a DIP switch. Supported I/O addresses: 3F8h, 2F8h, 3E8h, 2E8h. Supported interrupts: IRQ3, IRQ4, IRQ5, IRQ7. 8 KiB BIOS extension ROM. Supports 28C64 EEPROMs and 27C64 UV erasable EPROMs.The ROM is configured using a DIP switch: It can be enabled or disabled; the /WR line can be disabled; the address can be selected from 0C0000h to 0EE000h in 8 KiB increments. All functions above are optional (can be either installed or not)Configuration Switches and Jumpers SW1 – Serial Port (UART) Configuration SW1.1 – SW1.4 – Serial port IRQ selection SW1.1: ON – IRQ3 (default setting for COM2 and COM4)SW1.2: ON – IRQ4 (default setting for COM1 and COM3)SW1.3: ON – IRQ5SW1.4: ON – IRQ7 Note: Only one of SW1.1 – SW1.4 should be ON. All switches can be off if software doesn’t use interrupt based I/O. SW1.5 – SW1.8 – Serial port base address selection SW1.5: ON – 0x2E8 (COM4)SW1.6: ON – 0x3E8 (COM3)SW1.7: ON – 0x2F8 (COM2)SW1.8: ON – 0x3F8 (COM1) Note: One and only one of SW1.5 – SW1.8 switches should be ON. SW2 – ROM Configuration SW2.1 – SW2.7 – ROM Configuration SW2.1: ON – Enable ROM; OFF – Disable ROMSW2.2: ON – Enable EEPROM write. This jumper is only relevant for EEPROM. It should be OFF if EPROM is used.SW2.3 – SW2.7 – ROM address. Refer to the table below SW2.8 – Unused ROM Addresses Configuration Table SW2.3 SW2.4 SW2.5 SW2.6 SW2.7 Start Address End Address SW2.3 SW2.4 SW2.5 SW2.6 SW2.7 Start Address End Address ON ON ON ON ON 0xC0000* 0xC1FFF OFF ON ON ON ON 0xE0000** 0xE1FFF ON ON ON ON OFF 0xC2000* 0xC3FFF OFF ON ON ON OFF 0xE2000** 0xE3FFF ON ON ON OFF ON 0xC4000* 0xC5FFF OFF ON ON OFF ON 0xE4000** 0xE5FFF ON ON ON OFF OFF 0xC6000* 0xC7FFF OFF ON ON OFF OFF 0xE6000** 0xE7FFF ON ON OFF ON ON 0xC8000 0xC9FFF OFF ON OFF ON ON 0xE8000** 0xE9FFF ON ON OFF ON OFF 0xCA000 0xCBFFF OFF ON OFF ON OFF 0xEA000** 0xEBFFF ON ON OFF OFF ON 0xCC000 0xCDFFF OFF ON OFF OFF ON 0xEC000** 0xEDFFF ON ON OFF OFF OFF 0xCE000 0xCFFFF OFF ON OFF OFF OFF 0xEE000** 0xEFFFF ON OFF ON ON ON 0xD0000 0xD1FFF OFF OFF ON ON ON 0xF0000*** 0xF1FFF ON OFF ON ON OFF 0xD2000 0xD3FFF OFF OFF ON ON OFF 0xF2000*** 0xF3FFF ON OFF ON OFF ON 0xD4000 0xD5FFF OFF OFF ON OFF ON 0xF4000*** 0xF5FFF ON OFF ON OFF OFF 0xD6000 0xD7FFF OFF OFF ON OFF OFF 0xF6000*** 0xF7FFF ON OFF OFF ON ON 0xD8000 0xD9FFF OFF OFF OFF ON ON 0xF8000*** 0xF9FFF ON OFF OFF ON OFF 0xDA000 0xDBFFF OFF OFF OFF ON OFF 0xFA000*** 0xFBFFF ON OFF OFF OFF ON 0xDC000 0xDDFFF OFF OFF OFF OFF ON 0xFC000*** 0xFDFFF ON OFF OFF OFF OFF 0xDE000 0xDFFFF OFF OFF OFF OFF OFF 0xFE000*** 0xFFFFF Notes: * – Address range conflicts with EGA / VGA BIOS.** – 0xE0000 – 0xEFFFF address range is not available on IBM AT – Reserved for on-board BIOS extension ROMs*** – 0xF0000 – 0xFFFFF address range is not available on IBM PC, IBM XT, and IBM AT – Used system BIOS or reserved for on-board BIOS extension ROMs When setting ROM address make sure it doesn’t conflict with system BIOS and with BIOS extension ROMs of other cards installed in the system.Some component manufacturers may differ from those shown in the picture, but this does not affect the functionality of the device. Documentation is available onhttps://github.com/skiselev/isa-fdc

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