Timeline for Did anybody use PCBs as macro-scale mask-ROMS?
Current License: CC BY-SA 4.0
15 events
| when toggle format | what | by | license | comment | |
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| Jun 9, 2023 at 12:45 | comment | added | Criticizing Israel not allowed | And once you are using the diodes, you may as well realize that the diodes are what make the bits, and then instead of printing different PCBs with identical diode patterns, you print identical PCBs with different diode patterns because having unused diodes on your PCB costs money. | |
| Jun 7, 2023 at 22:50 | comment | added | Rich | You need the diodes or an alternative. Otherwise, your PCB consists of a single net which is either Vcc or Gnd. | |
| Jun 7, 2023 at 16:32 | comment | added | jpa | It's important to realize that mask ROM on integrated circuits does have a transistor per each bit stored. | |
| Jun 7, 2023 at 10:43 | comment | added | ghellquist | It is a bit unclear what exactly you are asking about. Simply printing a pattern on a PCB will not give very many bits of information, you need some kind a coding/decoding logic. The simplest as far as i know is one diode per "active" bit, either per one or per zero (your choice of logic level). In addition the PC would need decoding logic adressing the "bytes" on the card. | |
| Jun 7, 2023 at 5:27 | answer | added | malte0811 | timeline score: 25 | |
| Jun 7, 2023 at 2:01 | history | became hot network question | |||
| Jun 7, 2023 at 1:27 | history | edited | wrosecrans | CC BY-SA 4.0 |
added 547 characters in body
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| Jun 6, 2023 at 22:49 | answer | added | HABO | timeline score: 18 | |
| Jun 6, 2023 at 21:34 | comment | added | Wayne Conrad | The traces are easy, but you'll need a lot of diodes. | |
| Jun 6, 2023 at 19:04 | answer | added | manassehkatz-Moving 2 Codidact | timeline score: 8 | |
| Jun 6, 2023 at 19:02 | answer | added | Grabul | timeline score: 20 | |
| Jun 6, 2023 at 18:58 | history | edited | TonyM | CC BY-SA 4.0 |
Spelling and grammar.
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| Jun 6, 2023 at 18:44 | comment | added | Michael Kohne | Wikipedia has an entire article about diode arrays used this way. | |
| Jun 6, 2023 at 18:01 | comment | added | Raffzahn | 6" (15 cm for the literate) was in the early 70s still hard to make and rather expensive. Beside that, yes, of course have ROMs been build from single diodes. Any kind. One I remember was a key row/column to ASCII encoder ROM build from a long stretch of diodes. | |
| Jun 6, 2023 at 17:58 | history | asked | wrosecrans | CC BY-SA 4.0 |