80-Bus News

831353.

(PS

with Service Manuals.

. .

Faster than some cheap daisy wheels, and better print Q.

Ian on Ipswich (0473)

)

order,

Nascom 2/Nas-Sys or any system with 8-bit port/Z80.

IBM Selectric KBD Printer, ex 2741, with Hardware/Software interface for

Haggle around £115.00,

In excellent working

(0742) 460609.

standard height disk drives with PSU, £20.00. Carriage at cost.

Telephone

Twin 19" matching instrument cases,

GM804 5v/l2v PSU for twin disk drives, £15.00. to accommodate 5-card rack and PSU,

and 2

key-pad kit, £12.00. G

emini

Nascom 2 key

various electroni

board and PSU card, £60.00. Bi

ts & PCs hexadecimal and control

cs spares i

n origi

Nascom IMP printer with Imprint operating system, nal packing,

£110.00.

Nascom 1

spare ribbon cartridges and with

:

genuine

to refuse it.

St Albans (0727) 73057.

Gemini GM812 IVC card,

3, Zeap, Nas-Pen, Nas-Debug,

MHz), cased with power supply and earom programmer.

£120.00 ono.

Please make me an offer, I may not be able

Tool Kit, Documentation, etc,

Software includes Nas-Sys

£220.00 ono and

disk mounts, power supply.

£85.00 ono.

case suitable for Gemini/Nascom with 8-slot card rack, floppy Plus Nascom 2,

64K RAM A card (4

Large 19" rack

Micropolis 400K Single/S Software,

£75.00.

Mr Ward,

Macclesfield (0625) 610678.

i

ded Disk Drive,

£85.00.

Climax Colour Card and

Private Sales

SUMMARY OF GSX OPCODES = continued

Opcode

28

29

30

31

32

33

Description.

Input locator. This function serves as the interface between GSX and the outside world. Typically this will call the digitiser or mouse to return information on its whereabouts. When in request mode a cursor will appear on the screen and move according to the action of the specified input device. When in sample mode the current locator position is immediately returned and is often used in conjunction with ESCAPE 18 to plot a graphics cursor while at the same time displaying a rubber banding line.

Inquire input valuator. If some sort of analogue device is connected to the workstation, then the current value of its status is returned. Could be of use if graphical displays of external monitoring devices is required.

Inquire choice device. The choice device may be something like a keypad or function keys. For use in menu driven applications I would imagine.

String device. This returns a string from an input device which will of course be the keyboard in most cases.

Set writing mode. This affects the way in which lines or filled areas etc. are placed on the screen. The modes available are replace, overstrike, complement (XOR) and erase.

Set input mode. This lets you specify the type of input device you will require next i.e. locator, valuator, choice or string. You have also to specify whether this device is to operate in request or sample mode. In request mode the device waits until an event occurs such as the digitiser pen being pressed down to terminate input, in sample mode the current status or location of the device is returned without waiting.

26