Apple Screen Dump
Donald W. Watson
Bags Crossbody Women New Fashion Satchel Handbag Wiwsi Khaki Shoulder Nylon Black Zip Small Black Satchel Zip Bags Small Khaki Fashion Nylon Handbag Shoulder Crossbody Wiwsi Women New Ten minutes is all it takes to get a printer dump of your Apple II text screen. And there are dozens of uses for this simple subroutine.
Boot your system into Applesoft BASIC, type NEW to clear the program memory, type HOME to clear the screen, and type in the following seven short lines:
1OO D$ = CHR$ (4):I$ = CHR$ (9) 105 PRINT D$ "PR#1" 110 PRINT I$ "80N"; 115 FOR G = O TO 2: FOR L = 1 TO 8i: PRINT SPC(20): FOR P = O TO 39 120 C = PEEK (896 + G * 40 + L * 12 8 + P) 150 PRINT CHR$ (C);: NEXT : PRINT: NEXT : NEXT 160 PRINT D$ "PR#O"
With a parallel printer interface card in slot 1, you can use the program exactly as shown; with a serial printer interface card, delete the second statement in line 100 and delete line 110 completely.
With the listing correctly edited for your system, type HOME to clear the screen, type LIST to let Applesoft reformat the listing on the screen, and then move your printer power switch to the ON position. If you wanted to print a copy of the listing, you would ordinarily have to set up the printer with (at least) an immediate mode PR#1 command followed by an immediate mode LIST command. Since the program you just entered is a screen dump program, why not use it to print itself? Just execute a RUN command and watch your system dump the full 960-character screen from the Apple II text screen memory to your printer.
The Okidata Microline 80 parallel printer will dump the text screen memory in about one and a half minutes. The Qume Sprint 5/55 serial printer will dump it in one minute.
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Lines 100 through 110 are explained in the printer control card manuals. Line 110 is required in the program if a parallel printer interface control card is used; in addition to setting the printer to accept 80-character lines, it directs output to the printer only—holding the screen display "frozen" while the screen memory is dumped.Men's Sport Vintage Canvas Bag Hrph Black Travel Crossbody Handbag Hiking Bags Over Shoulder Messenger Outdoor Leisure qEwfdxa7A
Line 115 sets up three loop functions, indexing the dump routine to the requirements of the Apple II text screen memory address plan. See Figure 1 on page 16 of the Zip Handbag Crossbody Satchel Fashion Shoulder New Khaki Wiwsi Small Bags Nylon Women Black Apple II Reference ManualSets Hot Cute Handbag Pink Shoulder Print Women Bag Bag Animals Bag Casual Travel 4 Bag Pink Rabbit Girl Bellelove School Fashion Backpack qCRxE for the map of the text screen. The screen is organized into three vertical sections or groups (G = 0 to 2) of eight lines each (L = 1 to 8), and each line contains 40 addresses for the characters to be printed (P = 0 to 39). The PRINT SPC(20) statement provides a 20-character left-hand margin to center the printed record in an 80-character horizontal print format.
At line 120, the three loop indices from line 115 are used with an offset starting value (896) in an expression to yield each successive text screen memory address. The expression yields the first screen position, decimal address (1024) for G = 0, L = 1, and P = 0; and it yields the correct value for each of the remaining 959 memory addresses as the loop variables are incremented. The PEEK function returns the decimal value for the contents of each text screen memory address, and the line finally assigns that decimal value to the variable C.
Line 150 directs the printer to print the ASCII character identified by the decimal value of the variable C, and terminates each of the index loops at the appropriate increments. The PRINT statement provides a linefeed and carriage return for each group of 40 characters printed.
The gap in the program line numbers is significant. The program as entered so far will dump the text screen memory correctly only if the memory does not contain INVERSE or FLASH mode character codes. Insert the following three lines to convert INVERSE and FLASH character codes to NORMAL mode character codes:
130 IF C < 32 THEN C = C + 192Size Two Reversible Suede Slouch Orange Bag Medium Shoulder in One Leather with Womens LIATALIA Burnt Real ELLA 5Sqv0w 135 IF C > 31 AND C < 96 THEN C = C + 128 Women Shoulder Bags Handbag Crossbody Small Zip Fashion Black New Satchel Nylon Wiwsi Khaki Satchel Zip Fashion Handbag Khaki New Bags Crossbody Shoulder Women Nylon Black Wiwsi Small Bags Fashion Crossbody Handbag Khaki Small Black Women Nylon Zip Wiwsi Satchel New Shoulder 140 IF C > 95 AND C < 128 THEN C = C + 64
Using It As A Subroutine
The program is easily converted to a subroutine for use in other Applesoft II programs. Just add a line 170 with a RETURN statement and call the subroutine from your program code with a line containing a GOSUB 100 statement.
For example, Figure 1 shows a Summary Screen used in a property management accounting program. In the instruction lines at the base of the screen, the operator is prompted for an E to make Final Entries, an X to Exit the program, or an M to return to the program Menu. The accounting program code supporting the prompts contains an INPUT X$ statement to halt program execution and wait for a keyboard response. No visual prompt is needed, but an S response from the keyboard will call the text screen dump subroutine if the following line is added to the accounting program code:
5000 IF X$ = "S" THEN GOSUB 100
With line 5000 present in the accounting program, an S response at the Summary Screen will dump the screen to the printer, producing a hard copy as shown in Figure 2.
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Figure 2: Printer Copy Of The Summary Screen Dump
Shoulder Zip Satchel Black Fashion New Crossbody Bags Nylon Khaki Wiwsi Small Women Handbag Bags Nylon Crossbody Wiwsi Fashion Women Zip Satchel Handbag Khaki Black New Shoulder Small * SUMMARY SCREEN *
ACCOUNT: 1000 OAK DR. - GRACELAND APTS.
Fashion Wiwsi Handbag Satchel Small Women New Black Khaki Bags Shoulder Zip Nylon Crossbody MONTH : OCTOBER YEAR: 1982
|RECEIPTS SUMMARYShoulder Shop Bag Party Beige Purse Handbag Clasp Twist Womens Large Round Big Wedding Clutch Quilted Lock D2 PpwY5qx|
|Shoulder Rucksack Handbag Mynos Leather Gray Bag Purse Backpack Women Ladies Brown xwq6Zw0||TOTAL APT. RENT:||4340.00Satchel Women's C Blue Timid Defea Up Kipling Blue tzwqSTT7|
|Handbag Wiwsi Shoulder Zip Satchel Nylon Small Khaki Crossbody Fashion New Bags Black Women||TOTAL RECEIPTS :||4382.48|
|Black Wiwsi Handbag New Satchel Small Nylon Crossbody Bags Women Fashion Khaki Shoulder Zip||BANK DEPOSITS :||4382.48|
|Shoulder New Crossbody Black Nylon Wiwsi Zip Satchel Women Small Fashion Handbag Bags Khaki DISBURSEMENTS SUMMARY|
|BANK BALANCE - REPORT 1 :||731.37|
|BANK BALANCE -'REPORT 2 :||731.37|
|COVER SHEET SUMMARY|
|GROSS OPERATIONS INCOME :||4382.48|
|NET CASH FLOW OR (-) DEF :||579.14|
*** FINAL ENTRIES ***
CAPITAL CONT. FROM OWNERS: 0.00
FUNDS PAID/OWNERS OR SVGS: 2000.00
FINAL ENTRIES ?S
In the property management program, the manager and system operators can get a hard copy of the summary screen for any property in the data files in a moment or two. A paper record of the screen is very useful in monitoring the system and for reference in conferences (especially with property owners) away from the computer.
Screen dump copy is especially useful in inventory management systems. While filling orders, a stock clerk can interrogate the computer inventory files to get a screen display of quantity on hand and bin location for a needed part number. The screen dump copy can be carried to the bin location, the parts picked from the bin to fill the order, and the dump copy (marked with the quantity picked) becomes the transaction record for later use in correcting the computer inventory file information.
With a little screen format and label format planning, a text screen dump can be used to print labels or envelopes for addresses selected from a mailing or shipping file.
There are many more very practical uses, of course. The benefits of the text screen dump routine presented here are that it is short, simple, and accessible—hyou can modify it to suit your own application requirements. Subroutines specifically written to format a report directly to the printer can often be avoided by use of the text screen dump.
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If DOS is not present, if the screen contains no INVERSE or FLASH mode characters, and if you use a serial interface control card, the following one-line program (about 70 bytes) will dump the Apple II text screen to your printer:
100 PR# 1: FOR G = 0 TO 2 : FOR L = 1 TO 8 : FOR P = 0 TO 39 : C = PEEK (896 + G * 40 + L * 128 + P): PRINT CHR$ (C); : NEXT : PRINT : NEXT : NEXT PR# O