Breakout (Seletron): Difference between revisions
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!position | !position | ||
|- | |- | ||
|1x || [[256 x 1|74S201]] || 2h | |1x || [[SRAM 256 x 1|74S201]] || 2h | ||
|- | |- | ||
|1x || [[16 x 4|7489]] || 1b | |1x || [[16 x 4|7489]] || 1b | ||
Revision as of 21:32, 17 January 2015
| dumper | f205v, Kirmo |
| date | 15/10/2006 |
| emulator | |
| dev |
| name | 483 |
| description | Breakout (Seletron) [TTL] |
| year | 1978 |
| manufacturer | Seletron |
Technical references
CPUs
| QTY | Type | clock | position | function |
|---|---|---|---|---|
| 1x | oscillator | 4MHz | 1j |
ROMs
| QTY | Type | position | status |
|---|---|---|---|
| 1x | 82S23 | 2b | dumped |
RAMs
| QTY | Type | position |
|---|---|---|
| 1x | 74S201 | 2h |
| 1x | 7489 | 1b |
PLDs
| QTY | Type | position | status |
|---|
Others
1x 22x2 JAMMA edge connector
1x trimmer (volume)
1x 8x2 switches DIP
Notes
update 20140630: Kirmo dumped the PROM
update 20140107: Kirmo send the following: "Crystal frequency: depending on jumper (2jk): 4MHz , 8MHz , 16 MHz
Main clock frequency : 4 MHz (if an 8 or 16 MHz crystal is used, then the 74LS74 (3J) will cut the frequency down to 4 MHz)
RAM : 1x 74S201 (2H ; 256bit , 256x1 ; bricks in the wall) ; 1x 7489 (1B ; 64bit , 16x4 ; it's in the score section - maybe score memory?)
NOTE: RAM 7489 is open-collector (pull-up resistences are present on the pcb)
Files
-
PCB component side
-
PCB solder side
-
ROMs
483
