CHALLENGER SPORT J95 User Manual download pdf (Page 11)

Likewise, again because

of

the

dlrecl

ASCII usage by the monitor, the

carriage return (CRj, plus sign, minus

sign, forward arrow and

reverse

atrow

functions

of

the ASCII keyboard

will

per-

form Ihe same

lunctions

as those

equivalent keys on

the built·ln keypad.

It<.

Accessing the remainder

01

the

monJtOl"

functions

wilt require the use of

two

keys simultaneously,

in

the fashion

of

a shifted character. One

ollhe

keys is

the

CONTROL key

olten

found on an

ASCII keyboard. The function

01

this

key

(if your

keyboard

doesn'l

have one) is

to

inhibit

Ihe

output

ollhe

Iwo

mosl

signifi·

cant

bits

of

the ASCII output, in

this

case,to

fOl"ce

a zero

10

both

inpul

lines

2PAS

and

2PAS.

This

can

be

accomplish-

ed with a single

swllch

and one

type

7408

IC as suggested

In

Figure

2.

As..:.

11

\\

tT

1

---.j.r-L_/

2 PAS

Figure

2:

Adding a CONTROL key

STA (IND,Y) 6 5

(ABS,X) 5

<I

LOA ABS,Y

<I

3

INC ABS,X 7 6

DEC

ABS,X 7 6

ASL ABS,X 7 6

ADL ABS,X 7 6

ADA ABS,X

7 6

TAX IMPLIED 2 1

TXA IMPLIED

2 1

TAY IMPLIED

2 1

TYA IMPLIED 2 1

TSX

IMPLIED 2 1

TXS

IMPLIED 2 1

SEC IMPLIED 2 1

CLC IMPLIED 2 1

SED IMPLIED 2 1

CLD IMPLIED 2 1

SEI

IMPLIED 2 1

CLI IMPLIED 2 1

CLV IMPLIED 2 1

INX IMPLIED 2 1

DEX IMPLIED 2 1

DEY IMPLIED

2 1

PLP IMPLIED

4 3

PLA IMPLiED 4 3

NDP IMPLIED

2 1

ATI IMPLIED 6

5

ATS IMPLIED 6 4

TSX

FLAGS N,Z NO FLAGS

TSA ABS 6

5

Table 1: SY6516 Pseudc>16 compatability to

SY6500

series microprocessors

MICRO

--

The

6502

Journ.'

The SY6516 PSEUDO-tS microprocessor,

after power up,

is

identical

to

the 6500

series microprocessor.; in terms

01

In·

struction set (source code only),

registers

and system timing. However, due to

1m·

21:7

6516 NCycles

provements made in

the

state counter

and

look

ahead carry in the SY6516,

several

of

the

instructions

in

the 6500

series will require fewer cycles

to

ex·

ecule.

instructions

in

this

category are:

6500 NCycles

Addressing

Mod.

Instruction

The following functions

ate

access-

ed by

lirst

holding down the control key,

then pressing the

indicated ASCII key:

(control key

relerenced

by

CNTL below)

Store Double Byte: CNTL P

Load Paper Tape: CNTL

a

LOl (KIM format): CNTLR LD2 (SYM hi

spd): CNTL S

USAO: CNTL T

USA1: CNTL U

USA2: CNTL V

USR3: CNTL

W

USR4: CNTL X

USR5: CNTL Y

USA6: CNTL

Z

USA7; CNTL (

SAVP save paper tape: CNTL

SAVl

(KIM format):

CNTL)

SAV2 (SYM hi spell: CNTL

Febru.ry,

1980

As may

be

seen above, although cer·

lain

of

the

keys may

be

dillerent, all

01

Ihe monitor functions are accessible

Irom the

external keyboard, fullUling our

objecllves in adding it In the

firsl

place.

Actually I have hedged a bit for a couple

of

Items, but these Items I figure are not

needed on the

external keyboard, but

serve their purpose

beller

on the keypad,

specilically the DEBUG ON/OFF, the

SHIFT, and the ASCII keypad Items.

DEBUG

Is a hardware function which can

be

simulated by software, so in a program

we can access the function. SHIFT is a

monitor translation routine, appropriate

only

to

the placement and arrangement

of

the keys on the keypad. Finally, the

ASCII key

is

not necessary externally

since everything we

output

from the ex·

ternal keyboard Is

1000matled

in parallel

ASCII anyway.

The SYM·t is a very powerful

single-

board computer. The addition

01

a

parallel

ASCII keyboard inexpensively

provides us

with

a

basis

10l"

further ex·

pansion

of

the

SYM-l's

capabilities.

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 71 72

Comments to this Manuals

No comments