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Apples: Five Bits or Eight - tired of "Space Invaders"? Then turn your Apple II on to RTTY! ~ .. 0' ., Cll .. OJ 46 04 .~ .. ... "' . Carl Jensen WBt>MEP 9842 PaJa is Road Anaheim ell 91804 Dl:vsh-- - rl .. , •• lOll , ," I " 14LS'"' 1) l' ' ~ , " . e- , . • , If you thi ngs Apple II - . • , , f--' · • , • _O"PM' 721 .. , ,oO"p""'"H, It. leI • 1 'D' have run out of to do with your lately, you might " , ' S .,. --;-61 " 16 I " .. , .. , I., S , ....R. " ... 'S HI nvn ±'~. G NO ." , .' .., '"'''''' nr;; lJ I .'. .. lD' " TO' • ,.." ur, •• •"'""'---~ "'0' o 'DO 06 O~ u. , --::j:+=l=t=l=====~" ,' .~ l , ." • • , .-'.• • I .. •• '.LS'"' 'HS'"' '0 'HSO' It. ItS 74'S20 '''S'O Fig. 1. Apple If interface. ~ 66 73 Magazine · April. 1981 'I $£0....' 0"' 10"GlJI like to try thi s project. It will get you operating on 5-bit RTTY and, with a little rewiring, 8-bit ASCII also. For 8-bit ASCII . you will have to rewrite the program. The Apple II interface in Fig. 1 is built around the COM 2502 UART . The AY5-1013 is an exact re- p lacement and may be used. The system can be used with any SSB or FM transceiver. How It Works See Fig. 1. During receive, the UART accepts serial data at pin 20, RSI. When one complete character has been received. it is available in parallel form at RD1 through RD5. We know this character is ready when RDA goes high. RDA is tied to the Apple's databus bit 6 which we test in the program. The character is processed and printed on your TV monitor. Next, the Apple sends RDAR on bit 5, which resets RDA to low so that we can tell when the next character comes in, Durin g t ra nsmit, t he UAR T tells us it is ready to transmit t he next character by bringing TBMT high. TBMT is tied to data-bus bit 5. When the Apple detects bit 5 high, it puts the next character to be transmitted on data-bus bits 0 through 4 and sets bit 6 high also. Bit 6 high is TDS and enters the character into the UART at TD1 through TD5. The UART then clocks the character out serially at TSO . One start bit and two stop bits are added by the UART . Enabling RDE and SWE puts the received data and status bits on the data bus. When not enabled, these outputs are at a high impedance and will not disturb Apple operation. IC6 is the 16X clock generator. Provision is made for either 6(). or 100-wpm operation. Fig. 2 is the demodulator. Receiver audio is fed into J1 from your receiver headphone jack. The speake r is handy for li stening to incoming signals. The audio bandpass filter is not necessary but can help with QRM and QRN. Also, the output of the filter can be fed to a scope fo r use as a tuning indicator of sorts. More on t his later, I used an Autek filter. You can use a ny kind of fi lter you wish, or none at all. During FSK, when the demodulator senses a 2295 Hz tone, it puts out a high level at 12 . When a 2125-Hz
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