Virtual Heathkit H8 Computer Help

A variation of the Virtual H89 computer, configured as an H8. This variation always includes an H19 terminal and an INS8250 serial port at 350Q (0E8H) (actually, all four H8-4 ports), although the INS8251 (and cassette) at 370Q (0F8H) is an available option. Also, RAM via H8-1/3 cards do not support gaps, any gaps are automatically filled with RAM.

For additional help refer to the H89 Help files.

Keypad documentation for the (default) PAM-37 monitor ROM (primary function):

Key	Tip	Function
0	BOOT	Universal Boot, prompts for device, port, unit.
1	PRI	Primary Boot.
2	SEC	Secondary Boot.
3	RADIX	Radix select, Hex/Octal.
4	GO	Go, start execution at current PC.
5	IN	In, input byte ....
6	OUT	Out, output byte ....
7	SI	Single Step (not yet implemented).
8	LOAD	.
9	DUMP	.
A (+)	NEXT	In MEM, increment address and show value.
B (-)	LAST	In MEM, decrement address and show value.
C (*)	CANCEL	(Cancel other operations.)
D (/)	ALTER	Enter Alter Value mode.
E (#)	MEM	Select Memory display mode.
F (.)	REG	Select Register display mode.

Note, keys have alternate meanings in other contexts. For example, in the BOOT function (context) the keys 0-3 are used to select device, port, and unit.

The RTM/0 key is not implemented. The RST/0 (system reset) key is implemented by holding the Shift key down while clicking on the "D" ("/") key.

Keys may also be activated using the host computer keyboard. The keys 0-9, A-F, and legacy "+", "-", "*", "/", "#", and ".", are mapped to their keypad equivalents. In this case, the RST/0 function is implemented by combining the Alt key with either "D" or "/".

Configuration properties specific to the H8 follow.

model

Select H8 computer, with value "H8". Default is the H89.

sw1

Specifies the DIP-switch settings for "SW1". This is the logical equivalent of the H89 "SW501". Note that different monitor ROMs might interpret these switches differently.

slot_p1 .. slot_p10

Specifies add-on slots. Memory or I/O may go in any slot.

h8_beep

Specifies a file to use for emiting the beep/alarm on the H8 front panel. Default is "h19beep.wav".

h8_beep_volume

Specifies tjhe volume setting for the front panel beep/alarm. Specified as a percent, 0-100. Default is 50.

h89_keypad

This specifies the labels and tooltips (which appear when the mouse hovers over a key) for the keypad. Strings for each key are separated by semicolons (;). An optional replacement for the key name may be prefixed using a colon (:). If no key name is specified, the default will be used. If no tooltip is specified, that key will have none. Default, and example syntax, is (this matches keypad labels originally issued):

h89_keypad = 0:BOOT H17 170 SP;\
	1:PRI H47 174 AF;\
	2:SEC H67 270 BC;\
	3:RADIX H37 274 DE;\
	4:GO HL;\
	5:IN IX;\
	6:OUT IY;\
	7:SI IR;\
	8:LOAD AF';\
	9:DUMP BC';\
	A:+ NEXT DE';\
	B:- LAST HL';\
	C:* CANCEL;\
	D:/ ALTER RST/\u2191;\
	E:# MEM;\
	F:. REG PC

Not all devices from the H89 have H8 equivalents.

• "H8-1" (4K) or "H8-3" (8K) RAM, in multiples. Append base addr: 0, 8, ... 56.
• "H8-64" 64K DRAM (supports ORG0).
• The 256K RAM add-on X/2-H8 is "X2H8".
• Norberto's 512K RAM add-on is "H8-512K".
• Norberto's RTC (72421) is "H8RTCETH" or "RTC72421" (no ethernet support).
• The 4-port add-on serial card is "H8-4". Port properties use H89 prefixes "con", "lp", "modem", and "aux".
• The serial/cassette add-on card is "H8-5" (includes cassette support). Uses prefix "con" and "cass", overrides "con" on H8-4.
• Norberto's FT245R USB interface is "H8USB" (no VDIP1 support).
• The standard "H17", "H37", and "H67" disk devices are recognized (or "H8-xx").
• Legacy H8 cards may also use "WH...".