INMC 80 News


May-September 1981, Issue 4

Page 13 of 71


I recently got a Centronics 737 printer and with the help of a m/c programming genius, a 74123 and a few bits of wire, built a parallel interface, using, of course, the PIO. (The Centronics 737 is a delight to use and the script is most definitely correspondance quality. The write up in the March 81 issue of Practical computing is very fair and I agree with it.)

Now, not a lot of people know this as its never been published before, (I think), but it is possible to insert printer control codes into Naspen with complete success!

I have read the NASPEN documentation countless times and there are absolutely no clues as to this capability.

Some codes appear to be a little tricky, ESCape for example, but if you use the little ‘i’ (insert), it works perfectly. I won’t provide a list as working them out for oneself helps to memorise them, but if anyone would like a list, an SAE will do the trick.

For those interested in how Nascoms are housed, mine for the first 8 months of its life was housed in a settee, complete with PSU. The keyboard cable came from within to the keyboard which used to sit on my knees and the whole setup was very domestic but portability was a real problem!

I eventually bought a Ball Miratel Monitor from Electronic Brokers and shovelled the whole lot in. It was a tight squeeze I can tell you. None the less in that tiny cabinet I have the VDU and all its PSUs, Nascom 2 and all its PSUs, a board to give me seperate vert. and horiz. syne which the monitor requires, a tape drive relay board, a sound board (for the dreaded space invaders), a board for the Sargon chess graphics and last but not least a board for the printer interface.

I would like a 48K board as well as the 32K board but that is absolutely out of the question unless I bring the Nasbus outside the Ball Miratel housing but as everything is contained at the moment it is very neat and tidy.

Finally, I have worked professionally with Ap*le, Sh*rp, P*t and the like, and in my opinion, Nascom is streets ahead of any of them!

C.R. Bruce, Farnham, Surrey.

Space Sounds.

Space invader freak’s may find this worth a try, it’s a bit messy and slows the action down quite a bit, but visitors seem to prefer the game with sound.

The only hardware mod. is to hook a speaker onto port 0, bit 5, (that’s IC 24 pin 15 for Nascom 2), via a suitable buffer of course.

I read somewhere that someone wanted an approximation to PI better than 22 over 7, how about 355 over 113?

R. Cutler, Birmingham.

ZEAF Z80 Assembler -- Source Listing

6010 $ «K kK xk K K KK KK K KK K KK 0020 3} x SOUND for SPACE INVADERS. x

0030 3; * RAY CUTLER. 20-3-81 *

oo40 $ x KK KK KK KKK KK K KK

0060 $ Modify the original prog. as follows {t- 0070 3 CHANGE TO

0080 3; £1437-39 CD 00 0D – Hit by bombs

0090 3 £1495-97 CD CO 0C – Bombs hit shield 0100 } £16D5-D7 CD EO OC – Invaders moving O11L0 3 £1789-BE CD AO OC – Shoot

0120 3 £IAZA—-2ZS cb 90 OC – Hit target

oceo 0130 ORG £0080

This is an OCR’d version of the scanned page and likely contains recognition errors.

Page 13 of 71