Vzlet Z256

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.

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Contents
Development of CTU

Production of JZD ČSLA-VZLET Nové Město na Moravá

Approximately 20-40 units were produced, because it was a relatively unsalable computer, most went straight to the bazaar as new.

Circuit boards

I/O ports

RAM

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

FDC

D0 - FDC status register
D1 - FDC track register
D2 - FDC sector register
D3 - FDC data register
D4 - PIO channel A Data
D5 - PIO channel B Data
D6 - PIO channel A control
D7 - PIO channel B control
D8 - CTC channel 0
D9 - CTC channel 1
DA - CTC channel 2
DB - CTC channel 3
DC - SIO channel A Data
DD - SIO channel B Data
DE - SIO channel A control
DF - SIO channel B control

CPU

EC - DMA
F0 - PIO channel A Data
F1 - PIO channel B Data
F2 - PIO channel A control
F3 - PIO channel B control
F4 - CTC channel 0
F5 - CTC channel 1
F6 - CTC channel 2
F7 - CTC channel 3
F8 - SIO channel A Data
F9 - SIO channel B Data
FA - SIO channel A control
FB - SIO channel B control
FC - PSK Site selection register
-> bit function specifies page address
0.1 AR16,AR17 in memory read cycle
2,3 AW16,AW17 in the memory write cycle
4.5 AM16,AM17 in the operation code reading cycle in
6 --- not used
7 /MONITOR log.0 activates the 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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