Vzlet Z256

Also called agroPUTER85.Designed by Ing. Petr Kotek, Ing. Jiří Filčev, CSc., ČVUT FEL, Jan Šedivý, K331 Katedra teorie obvodů.It was manufactured from 1988 by JZD ČSLA-VZLET. Hardware is based on U880D.

This topic contains doubts or inaccuracies that need to be corrected. More information follows below.

Parts of this topic may be machine translated.

Contents

Printed circuit boards
I/O ports

CTU development

Production of JZD Čsla-Vzlet Nové Město na Moravě

Made by an estimate of about 20-40pcs, because it was a relatively unsalable computer, most went as new straight to the bazaar.

Printed circuit boards

Also applicable independently outside of the 256 assembly
connectors: bus A1 FRB62 / Paralell B1 FRB30 / UART C1 FRB20

connectors: bus A1 FRB62

FTCB

connectors: bus A1 FRB62 FDC B2 FRB30 / UART / MGF C2 FRB20 / D1 FRB20 keyboard

CRTC (uses MC6845 or its clones)

Connectors: bus A1 FRB62 / VIDEO B3 FRB20 Connection to Mercury's modified monitor, interesting is that it uses CRTC timing and video signal to the maximum.

I/O ports

RAM

C0 and C2 - activates RAM control plate (write)
C1 and C3 - activates the RAM controlled board (writing)
C0 and C1 - suppresses parity control
C2 and C3 - releases parity control

FDC

D0 - FDC status register
D1 - FDC register of tracks
D2 - FDC register of sector
D3 - FDC Data Register
D4 - PIO channel and data
D5 - Pio channel B data
D6 - Pio channel and driving
D7 - PIO channel B control
D8 - CTC channel 0
D9 - CTC channel 1
Da - CTC channel 2
Db - CTC channel 3
DC - SIO channel and data
DD - SIO channel B data
DE - SIO channel and driving
DF - SIO channel B driving

cpu

EC - DMA
F0 - PIO channel and data
F1 - Pio channel B data
F2 - Pio channel and driving
F3 - PIO channel B control
F4 - CTC channel 0
F5 - CTC channel 1
F6 - CTC channel 2
F7 - CTC channel 3
F8 - SIO channel and data
F9 - SIO channel B data
FA - SIO channel and driving
FB - SIO channel B driving
FC - PSK Register of Page Choice
-> Bit Function determines the address of the page
0.1 AR16, AR17 in the Reading Cycle
2,3 AW16, AW17 in a memory writing cycle
4.5 AM16, AM17 in the cycle Reading code in IN
6 --- not used
7 /Monitor Log.0 activates monitor memories

Inaccuracies/doubts related to the topic

Uncertain alternate name or production years. Necessary to find out from period documents.

References

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