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GordonZaft
PostPosted: Wed Aug 18, 2010 4:02 am 
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I am wanting to work with a small 6502 system (not 65816) and I'm considering ordering some of Daryl Rictor's SBC 2.5 board via ExpressPCB.

Before I do that -- is there anyone who has one of these boards (populated or not) that doesn't want it anymore and would be willing to part with it?

Alternatively -- anyone want to go in on boards with me? Minimum seems to be 2, but if we get it up to 4 they wind up being a bit over $30 each.

Let me know!
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GARTHWILSON
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PostPosted: Wed Aug 18, 2010 6:14 am 
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I have a couple of rev. 2.3 that I got for a project that I never went through with. One of them has all the sockets and pin headers, and the other one is bare. I wouldn't mind selling them, even at a loss.

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Martin_H
PostPosted: Wed Jan 08, 2014 5:29 pm 
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I've been thinking about building a retro computer for some old school robotics projects. Looking at all of the online plans the SBC 2.5 looks the best. I know this is an old thread, but has anyone done a a bulk order since this was posted?

I used ExpressPCB to price a board and the minimum size is two boards and the cost with shipping was around $110. Most of that cost was setup fees, so that's not the way to go unless you are part of a bulk order.

Garth do you still have any of the 2.3's left over? Do the instructions for the 2.5 work with those?

I might be able to fabricate the PCB myself using toner transfer, but the through holes wouldn't be plated which would make assembly a bit trickier. The other possibility is wire wrapping Douglas Beattie's DIY 6502 which looks possible, but tedious.
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GARTHWILSON
PostPosted: Wed Jan 08, 2014 5:45 pm 
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Welcome!

Quote:
Garth do you still have any of the 2.3's left over?

No, they were subsequently spoken for, so I don't have them anymore. I have my own website now (and I edited my post above to make the signature line show) and one of the major features is 6502 PRIMER: Building your own 6502 computer. (It is actually a set of 22 articles, covering many aspects of the design, construction (including wire-wrap and making your own boards), goals, debugging, and interfacing applications of a home-made 6502 SBC.)

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BigDumbDinosaur
PostPosted: Wed Jan 08, 2014 7:27 pm 
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Martin_H wrote:
I used ExpressPCB to price a board and the minimum size is two boards and the cost with shipping was around $110. Most of that cost was setup fees, so that's not the way to go unless you are part of a bulk order.

$110 sounds high for some reason. Which board service did you price? Are you in the USA?

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Martin_H
PostPosted: Wed Jan 08, 2014 7:56 pm 
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I live in the US, I chose standard service and shipping. I reran it again and it was 104.31 for a minimum order of two boards. The setup fees were $63 ($61 + $1 per board), the area cost was $27.30, the drilling cost for 462 holes was $2.31, and shipping was 11.70. It would only be $136 for four boards, so it isn't the per board cost but the setup fees that contribute the bulk of the costs.
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BigDumbDinosaur
PostPosted: Wed Jan 08, 2014 8:19 pm 
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Martin_H wrote:
I live in the US, I chose standard service and shipping. I reran it again and it was 104.31 for a minimum order of two boards. The setup fees were $63 ($61 + $1 per board), the area cost was $27.30, the drilling cost for 462 holes was $2.31, and shipping was 11.70. It would only be $136 for four boards, so it isn't the per board cost but the setup fees that contribute the bulk of the costs.

I thought that Daryl had designed the SBC 2 series to use EPCB's mini-board service, which should be a bit cheaper.

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Martin_H
PostPosted: Wed Jan 08, 2014 8:47 pm 
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When I tried mini-board I got an error that a MiniBoard is only allowed 350 holes while the layout includes 719. So I chose standard instead.
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8BIT
PostPosted: Thu Jan 09, 2014 5:33 am 
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My SBC-1 used the mini-board service. The later SBC's were all too big. As I recall, I did at least 16 boards per bulk purchase, which brought the per board cost down to the $20-$25 range. I don't have any boards left. If you put together a bulk order, I would be interested in getting some extras. That way I can keep some around for future buyers.

Daryl

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BigDumbDinosaur
PostPosted: Thu Jan 09, 2014 5:42 am 
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Martin_H wrote:
When I tried mini-board I got an error that a MiniBoard is only allowed 350 holes while the layout includes 719. So I chose standard instead.

Was that the mini-board or the mini-board pro?

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Martin_H
PostPosted: Thu Jan 09, 2014 2:35 pm 
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There are four radio buttons in the UI, and it was button 4 "MiniBoard Service".

Daryl, I just priced 16 board and the per board cost was $20.56 which is pretty reasonable. I may put together a bulk order, but I'll wait a bit to see how the W65C134 Prototype thread works out. The built in ROM monitor could solve the problem of needing an EEPROM programmer.
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Martin_H
PostPosted: Thu Jan 16, 2014 9:29 pm 
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I took the parts list and went to Mouser and composed a spreadsheet of parts, the cost, and the total. Here's the CSV below. Most of the parts I was certain I located the right one, I'm unsure if I located the correct TTL oscillator.


Title,Cat. No.,Quantity,Price Each,Total Price,Cat. URL,Notes
pin header strip,517-929647-01-36-EU,1,$2.31,$2.31,,4 1x3 + 3 1x2 pin headers
2x3 headers,855-M22-2020705,2,$1.02,$2.04,,J1 ROM OPTS & OPT2
2x5 pin header,649-77313-122-10LF,2,$0.59,$1.18,,JP1 & OPT1
2x7 pin header,649-77313-101-14LF,4,$0.53,$2.12,,P-1 to P-4
2x25 pin header - Expansion Port,517-929665-01-25-I,1,$3.50,$3.50,,J12 Expansion Port
.1uF,810-FK18X7R1H104K,10,$0.16,$1.60,,"c8-11, c13-c16. Using an ST 232 requires four more of these."
4.7uF,647-USP1C4R7MDD,2,$0.30,$0.60,,"c2, c3. Using an ST 232 eliminates the need for two of these."
10uF,871-B41002A4106M000,5,$0.10,$0.50,,"C1, c4, c5, c6, c12. Using an ST 232 eliminates the need for two of these."
22pF,581-SR215A220KARTR1,1,$0.19,$0.19,,c7
1.0 MHz TTL Osc,520-TCF100-X,1,$1.87,$1.87,,Note sure if this is correct http://www.mouser.com/ProductDetail/ECS ... Vqc79V8%3d
1.8432MHz crystal,520-HCA184-13X,1,$1.38,$1.38,,
3.3k Ohm (3 res SIP with common),652-4604X-1LF-3.3K,1,$0.25,$0.25,,
3.3k Ohm (5 res SIP with common),71-CSC06A01-3.3K,1,$0.56,$0.56,,
W65C02S,955-W65C02S6TPG-14,1,$6.95,$6.95,,IC1
28256 EEPROM,556-AT28C25615PU,1,$8.56,$8.56,,IC2
62256 Static RAM,913-AS6C62256-55PCN,1,$1.79,$1.79,,IC3
74LS30,595-SN74LS30N,1,$1.01,$1.01,,IC4
74LS00,595-SN74LS00N,1,$0.67,$0.67,,IC5
74LS138,595-SN74LS138N,1,$0.86,$0.86,,IC6
65C51,955-W65C51N6TPG-14,1,$7.20,$7.20,,IC7
MAX232 or equivelant (e.g. ST232),700-MAX232CPE,1,$3.53,$3.53,,IC8
65C22,955-W65C22N6TPG-14,2,$6.95,$13.90,,IC9 and IC10
DS1813 or equivelant,700-DS1813-10+,1,$1.26,$1.26,,IC11
Switching Diode or strap,512-1N4148TA,3,$0.10,$0.30,,"D1, D2, D3"
LM78L05,511-L7805CV,1,$0.59,$0.59,,T1
POWER IN (user preference for part),,1,,$0.00,,
RESET switch inputs,506-MSPS103C0,1,$2.18,$2.18,,
,,,,,,
,,,,,,
,,,total,$66.90,,
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lordbubsy
PostPosted: Thu Jan 16, 2014 9:53 pm 
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I'm unsure if I located the correct TTL oscillator
searching for the part number "ECS-100AX-1.0" and then clicking on pictures I came across this link: http://www.syntax.com.tw/products/produ ... temid=6353

Additionally, looking at the specs. 1MHz, DIP14 and 5V, I’d give it a high chance that it’s the correct one.

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GARTHWILSON
PostPosted: Thu Jan 16, 2014 10:37 pm 
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For the really inexpensive parts, let me recommend buying lots more, not just one or two. If I buy just one, I'm likely to drop it and run over it with the wheels of my desk chair or damage it some other way, or I'll need another one soon for another project and wish I didn't have to take the time to order it again. For inexpensive parts, I always get extras.

On the headers, for this kind of thing, I would buy them in longer strips and cut to the required number of pins on an as-needed basis.

I would also recommend replacing 74LS with 74HC or 74AC. There's virtually no reason to use LS anymore. CMOS can pull up much harder than LS, it's much lower power, and even HC is usually (although not always) a little faster than LS, and AC is three times the speed. LS inputs will load down a circuit much more heavily than any of the CMOS ones will.

Happy building!

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BigDumbDinosaur
PostPosted: Fri Jan 17, 2014 2:38 am 
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Martin_H wrote:
I took the parts list and went to Mouser and composed a spreadsheet of parts, the cost, and the total.

Code:
Title                               Mouser Cat. No.      Quan     Each      Total        Notes
———————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————
pin header strip                    517-929647-01-36-EU    1     $2.31      $2.31        4 1x3 + 3 1x2 pin headers
2x3 headers                         855-M22-2020705        2     $1.02      $2.04        J1 ROM OPTS & OPT2
2x5 pin header                      649-77313-122-10LF     2     $0.59      $1.18        JP1 & OPT1
2x7 pin header                      649-77313-101-14LF     4     $0.53      $2.12        P-1 to P-4
2x25 pin header - Expansion Port    517-929665-01-25-I     1     $3.50      $3.50        J12 Expansion Port
.1uF                                810-FK18X7R1H104K     10     $0.16      $1.60        c8-11 &  c13-c16. Using an ST232 requires 4 more of these.
4.7uF                               647-USP1C4R7MDD        2     $0.30      $0.60        c2 c3. Using an ST 232 eliminates the need for 2 of these.
10uF                                871-B41002A4106M000    5     $0.10      $0.50        C1 c4 c5 c6 c12. Using an ST232 eliminates the need for 2 of these.
22pF                                581-SR215A220KARTR1    1     $0.19      $0.19        c7
1.0 MHz TTL Osc                     520-TCF100-X           1     $1.87      $1.87
1.8432MHz crystal                   520-HCA184-13X         1     $1.38      $1.38               
3.3k Ohm (3 res SIP with common)    652-4604X-1LF-3.3K     1     $0.25      $0.25               
3.3k Ohm (5 res SIP with common)    71-CSC06A01-3.3K       1     $0.56      $0.56               
W65C02S                             955-W65C02S6TPG-14     1     $6.95      $6.95        IC1
28256 EEPROM                        556-AT28C25615PU       1     $8.56      $8.56        IC2
62256 Static RAM                    913-AS6C62256-55PCN    1     $1.79      $1.79        IC3
74LS30                              595-SN74LS30N          1     $1.01      $1.01        IC4
74LS00                              595-SN74LS00N          1     $0.67      $0.67        IC5
74LS138                             595-SN74LS138N         1     $0.86      $0.86        IC6
65C51                               955-W65C51N6TPG-14     1     $7.20      $7.20        IC7
MAX232 or equivelant (e.g. ST232)   700-MAX232CPE          1     $3.53      $3.53        IC8
65C22                               955-W65C22N6TPG-14     2     $6.95     $13.90        IC9 and IC10
DS1813 or equivelant                700-DS1813-10+         1     $1.26      $1.26        IC11
Switching Diode or strap            512-1N4148TA           3     $0.10      $0.30        "D1         D2         D3"
LM78L05                             511-L7805CV            1     $0.59      $0.59        T1
POWER IN (user preference for part)                        1     $0.00               
RESET switch inputs                 506-MSPS103C0          1     $2.18      $2.18                       

Why the 74LS logic?

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