File:Commodore PET universal board logic diagram 8032087 sheet 5, main RAM UA4-UA19.png
Summary
[edit | edit source]
The main RAM sheet of Commodore's logic diagram for the universal dynamic PET board, drawing 8032087 Rev C, sheet 5 of 11. It shows the sixteen 4116 dynamic RAMs: the upper block UA4, UA6 to UA18 on CAS1 and the lower block UA5, UA7 to UA19 on CAS0, both on RAS0. Each column of two chips shares one data line: UA4/UA5 D7, UA6/UA7 D6, UA8/UA9 D5, UA10/UA11 D4, UA12/UA13 D3, UA14/UA15 D2, UA16/UA17 D1 and UA18/UA19 D0. The supply pins are VBB pin 1 (-5 V), VDD pin 8 (+12 V), VCC pin 9 (+5 V) and VSS pin 16. The 74LS244 buffers UE8, UE9 and UE10 drive the refresh, row and column addresses.
Source
[edit | edit source]
Commodore Business Machines, PET 4000 Series Technical Manual, P/N 990438, hosted on this wiki as File:Commodore PET 4000 Series Technical Manual.pdf (PDF page 13). Rendered at 200 dpi, rotated, cropped and scaled for the wiki. See Commodore PET 4000 Series Technical Manual.
Author
[edit | edit source]
Commodore Business Machines
Licence
[edit | edit source]
Copyright Commodore Business Machines. Hosted for preservation and repair reference, with the source cited.
File history
Click on a date/time to view the file as it appeared at that time.
| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 11:19, 25 October 2026 | | 1,860 × 1,210 (117 KB) | Josh (talk | contribs) | Manufacturer schematic crop for PET 4000 RAM guide |
You cannot overwrite this file.
File usage
The following page uses this file:
