IBM 500 manual COM Port Setup, Video Modes

SurePOS 500 4846-XX5 Technical Reference

768-831 KB	C0000-CFFFF	64 KB	Video BIOS ROM (shadowed)
832-835 KB	D0000-D0FFF	4 K	Network ROM boot loader
836-895 KB	D0FFF-EFFFF	124 KB	Free for EMM386
896 – 959KB	E0000-EFFFF	64KB	Free for EMM386
960 KB - 1MB	F0000-FFFFF	64 KB	System ROM BIOS
1- 16 MB	100000-FFFFFF	15 MB	PCI/ISA Space
16 MB – 4095.5	1000000-FFF7FFFF	4079.5 MB	OS, PCI adapter memory decode, etc.
GB
4095.5 MB -	FFF80000-FFFFFFF	512 KB	System ROM BIOS (ISA Bus)
4096 MB

3.9COM Port Setup

Physical	Tailgate	Function	Connector	Location	Notes	Default
	Port					I/O and
UART			Type
	Name					IRQ
UART1	COM1	Available to	RJ45	Rear	BDA COM1	3F8/4
		user		Tailgate
UART2	COM2	Available to	RJ45	Rear	BDA COM2	2F8/3
		user		Tailgate
UART3	COM3	Available to	RJ45	Rear	COM6	2E0/11
		user		Tailgate
		Distributed		Rear	BDA COM4
		VFD	DB15 F
				Tailgate	Only one of integrated or
		connection
					distributed VFD may be
		Integrated
UART4	Dist-VFD		Custom	Tower Top	enabled at the same time.	2E8/6
		VFD
					CMOS Setup allows
		connection
					selection.
		8051 1	Internal	Internal	Communications with 8051
					for EEPROM, cash drawer,
					and LCD control.
UART5	n/a	MSR	RJ45	Tablet Side	BDA COM3	3E8/5
		connection
					COM5
UART6	n/a	Touch	Internal	Internal	Resources hardcoded to	2D8/7
					2F0h/IRQ 7

3.10 Video Modes

Supported VGA Video Display Modes

		Color					Dot	Horiz.		Video
Video	Pixel		Mode	Display	Font	Character	Cloc		Vert
		Depth					k	Freq.		Memory
Mode	Resolution		Type	Adapter	Size	Resolution			Freq(Hz)
		(bpp)					(MHz	(KHz)		(KBytes)
							)

1Information for communicating with the 8051 can be found in the Bryce I/O Subsystem Microcontroller Firmware Specification.

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