Vector Graphic 48K Dynamic Memory Board Manual Download Page 1 | Manualshive

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Summary of Contents for 48K Dynamic Memory Board

Page 1: ...Y8K Dynamic Memory Board I I Ci O t tAi l iC inc...

Page 2: ...DYNAMIC MEMORY BOARD Revision 3 February 7 1979 opyright 1979 Vector Graphic Inc...

Page 3: ...hic Inc Revision Numbers The revision number and date of release of each page 1erein at the bottom of each page The revision number and date of on t he Title page corresponds to that of the page most...

Page 4: ...d also at Buyer s expense to VECTOR GRAPHIC INC for such repair replacement or correction In performing any repair replacement or correction after expiration of the period set forth above Buyer will b...

Page 5: ...eration 3 2 1 2 2 The The Circuitry 48K Board Refresh Feature of the Z 80 Board 3 4 III User s Guicle 6 IV V VI 3 1 3 2 3 3 3 4 3 5 Modifications to the 48K Board Z 80 Board The 3 1 1 3 1 2 READY Refr...

Page 6: ...boards cost considerably more take up more space and require more power Other dynamic memory boards use complex support logic on the board rather than the built in features of the Z 80 In 3ddition to...

Page 7: ...oing CAS strobe which latches the addresses in the memory chips and initiates a timing sequence in the chip to enable the output drivers if it is a read cycle or to write the data into the selected me...

Page 8: ...ignals 1 if the CPU is held in a reset condition for more than 2 mS Condition 1 would not occur in a Vector Graphic computer but can occu in a system with a front panel where the READY line is used to...

Page 9: ...48K board as a separate board not as part of a complete Vector Graphic computer you will have to make certain minor modifications to your Z 80 CPU board so that the Reset circuit responds to the signa...

Page 10: ...lt in loss of memory data since the memory is not being refreshed while the CPU is in a reset state rtw ubove two 1tlod if ications an discussed in deta il be low 3 1 1 Refresh Signal 1 you a t e us I...

Page 11: ...5V 4 I Ta z 80 CH I P c TIC I 25 100 mfd _ TYPI CAL ORIGINAL CIRCUIT PIN S I I JO z 80 JUMPER C IP INSTALLED MOuIFIED CIRCUIT kemove the Resistor R and Capacitor C from the board Then connect a jumper...

Page 12: ...display glitching These last two are usually not a problem due to the relatively short wait period on the order of a few microseconds 3 3 Usi DMA If you are using DMA along with the 48K board the DMA...

Page 13: ...automatically repeat and no addresses other than COOO should be printed out Depress the RESET key on the front panel to terminate the test 11 lore thorough test can be made using the MDIAG program sup...

Page 14: ...ta input and output Compatible with Z SO at 4MHZ without wait states O 25A of SV and O 20A of 16V typical Ouput buffer disable compatible with Vector Graphic PROM RAM Reset and Go Board Must not inter...

Page 15: ...Vector Graphic 4BK Dynamic RAM Board 11 D7 D6 D5 04 D3 02 01 00 U3 Ul0 0 3FFF U15 U22 4000 7FFF U26 U33 8000 BFFF 48K DYNAMIC MEMO Y CHIP LOCATIONS Rpvision 1 1 3 78...

Page 16: ...OC 1 01 SSO I 7 I 6 I 5 V ROW 101 _ a n I C_S 4 I 3 I 1 4 I U T4 LSOO l 1 131 III at 132 I G l OLSn u 6 5 4 AI 4 r4LS02 P ANTOM A I UC ATIOH I v ISS 0 _ 0I0laf1tD TOl NCUML DO NOT CAU DRAWING 3 2 I I...

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