Hi!
I extracted the archive using lha (from "lhasa" package under Debian Linux), then I used a simple Turbo Basic program to load *.GR8 file:
10 GRAPHICS 24
11 POKE 709,0:POKE 710,15:POKE 712,15
12 OPEN #1,4,0,"D:MICPRINT.GR8"
13 BGET #1,DPEEK(88),7680
14 CLOSE #1
99 GOTO 99
then You have:
The "DOC" file inside the archive is plain TEXT file but the "end of line" markers is in 8-bit Atari format, so you can convert it to PC by changing every $9B to CR/LF bytes. The file is in polish language and contains some additional info for schematic (part types, some assembly instructions).
OK, here You have some kind of translation with some additional explanations:
Micro Print
-----------
The archive contains:
MICPRINT.GR8 - schematic of micro-print interface
MICPRINT.DOC - this file
MICPRINT.EPR - data file contains EPROM content
Bill of materials needed for build microprint interface:
1 pcs) 8048 or 8049 microcontroller
1 pcs) 2764 EPROM
1 pcs) 3.58MHz Quartz Crystal or Ceramic resonator
1 pcs) 2N2222 transistor
2 pcs) 33pF ceramic capacitors
1 pcs) 1uF/10V electrolytic capacitor
1 pcs) 22uF/10V electrolytic capacitor
1 pcs) 100nF ceramic capacitor (or 33nF)
3 pcs) sockets for IC's (optional)
1 pcs) Centronics AMPHENOL connector
1 pcs) Atari SIO plug
1 pcs) Housing
1 pcs) 10 kohm resistor
Some additional info to the interface schematic:
- in the centronics AMPHENOL connector connect pins from 19 to 30 and connect
it to the GND. The connector have numbers of each pin, so it should not be
a problem with location of correct pins.
The same is about the Atari SIO plug, this is standard serial peripheral Atari plug.
Atari Serial Plug - view from connection side:
2 12
o o o o o o
o o o o o o o
1 13
- to the pins 2 & 3 of microcontroller (MCU) connect 33pF capacitors
- to the pin 4 of MCU connect a 1uF capacitor
- the to the wires that deliver power to the MCU (+5V, GND) add the power
filtering capacitors: 22uF and 100nF (or 33nF). Remember that capacitors
are not present on the schematic.
- the Quartz Crystal must be 3.58MHz (ceramic resonator is recommended)
- The 2764 EPROM must be programmed with "MICPRINT.EPR" file. The EPROM
can be also 27128 or 27256 type, but the content must be properly prepared.
That means that the contents of the file must be replicated the appropriate
number of times, or additional and unused address lines must remain connected
to GND.
- in the original version pin #2 of MCU is connected through 10kohm resistor
to the +5V power rail.
The whole thing was created with Tadeusz's help (thank you!)
Zenon/DIAL
5.08.2000
